docs: add region failover section #1056
Conversation
WalkthroughThe recent changes introduce several enhancements to documentation and configuration files across various language versions. Key updates include adding new sections on region failover and Write-Ahead-Log (WAL) configurations, refining configuration details, and correcting links and comments to improve clarity and functionality. Changes
Poem
Thank you for using CodeRabbit. We offer it for free to the OSS community and would appreciate your support in helping us grow. If you find it useful, would you consider giving us a shout-out on your favorite social media? TipsChatThere are 3 ways to chat with CodeRabbit:
Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments. CodeRabbit Commands (invoked as PR comments)
Additionally, you can add CodeRabbit Configration File (
|
Deploying greptime-docs with
|
| Latest commit: |
c65a978
|
| Status: | ✅ Deploy successful! |
| Preview URL: | https://ee2383a5.greptime-docs.pages.dev |
| Branch Preview URL: | https://feat-failover.greptime-docs.pages.dev |
There was a problem hiding this comment.
I haven't understood the region failover document:
- What is region failover? How does GreptimeDB implement region failover?
- How users setup region failover?
- What is the read amplification? and how to deal with the read amplification?
- What is Replay and Replay size? what's the relationship between replay size and throughput?
- How to test failover?
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
![coderabbitai[bot]](https://avatars.githubusercontent.com/in/347564?s=60&v=4){kind=small}
There was a problem hiding this comment.
Actionable comments posted: 0
Outside diff range, codebase verification and nitpick comments (5)
docs/nightly/en/user-guide/operations/region-failover.md (3)
5-12: Fix repeated word in the warning block.The section is clear and well-structured, but there is a repeated word "Warning" in the warning block.
- :::warning Warning + :::warningTools
LanguageTool
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
26-36: Fix capitalization in the section title.The section is clear and provides useful information, but the title should use "Region Failover" for consistency.
- ## The recovery time of Region failover + ## The recovery time of Region Failover
38-78: Consider further explaining how factors affect recovery time.The section is clear and provides detailed information, but it could benefit from further explanation of how the factors affect recovery time.
The Recovery Time of Region Failover depends on: - The number of regions per Topic. - The Kafka cluster read throughput performance. :::tip Note In best practices, the number of topics/partitions supported by a Kafka cluster is limited (exceeding this number can degrade Kafka cluster performance). Therefore, we allow multiple regions to share a single topic as the WAL. ::: The cost of multiple regions to share a single topic is read amplification during replaying WAL.docs/nightly/en/user-guide/operations/configuration.md (2)
443-443: Fix missing comma in the description.The description of
global_write_buffer_sizeis missing a comma.- If not set, it's default to 1/8 of OS memory with a max limitation of 1GB. + If not set, it's default to 1/8 of OS memory, with a max limitation of 1GB.Tools
LanguageTool
[uncategorized] ~443-~443: Possible missing comma found.
Context: .... If not set, it's default to 1/8 of OS memory with a max limitation of 1GB. ...(AI_HYDRA_LEO_MISSING_COMMA)
361-367: Fix punctuation issues in the descriptions.The descriptions of WAL options have punctuation issues.
- `broker_endpoints`: The Kafka broker endpoints. - `max_batch_bytes`: The max size of a single producer batch. - `consumer_wait_timeout`: The consumer wait timeout. - `backoff_init`: The initial backoff delay. - `backoff_max`: The maximum backoff delay. - `backoff_base`: The exponential backoff rate. - `backoff_deadline`: The deadline of retries. + - `broker_endpoints`: The Kafka broker endpoints. + - `max_batch_bytes`: The max size of a single producer batch. + - `consumer_wait_timeout`: The consumer wait timeout. + - `backoff_init`: The initial backoff delay. + - `backoff_max`: The maximum backoff delay. + - `backoff_base`: The exponential backoff rate. + - `backoff_deadline`: The deadline of retries.Tools
LanguageTool
[uncategorized] ~361-~361: Loose punctuation mark.
Context: ...line = "5mins" ``` -broker_endpoints: The Kafka broker endpoints. - `max_batc...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~362-~362: Loose punctuation mark.
Context: ...ka broker endpoints. -max_batch_bytes: The max size of a single producer batch...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~363-~363: Loose punctuation mark.
Context: ...roducer batch. -consumer_wait_timeout: The consumer wait timeout. - `backoff_i...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~364-~364: Loose punctuation mark.
Context: ... consumer wait timeout. -backoff_init: The initial backoff delay. - `backoff_m...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~365-~365: Loose punctuation mark.
Context: ...e initial backoff delay. -backoff_max: The maximum backoff delay. - `backoff_b...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~366-~366: Loose punctuation mark.
Context: ... maximum backoff delay. -backoff_base: The exponential backoff rate. - `backof...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~367-~367: Loose punctuation mark.
Context: ...ntial backoff rate. -backoff_deadline: The deadline of retries. ### Logging o...(UNLIKELY_OPENING_PUNCTUATION)
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files ignored due to path filters (1)
docs/public/remote-wal-read-amplification.pngis excluded by!**/*.png
Files selected for processing (4)
- docs/auto-imports.d.ts (1 hunks)
- docs/nightly/en/summary.yml (1 hunks)
- docs/nightly/en/user-guide/operations/configuration.md (12 hunks)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
Files skipped from review due to trivial changes (2)
- docs/auto-imports.d.ts
- docs/nightly/en/summary.yml
Additional context used
LanguageTool
docs/nightly/en/user-guide/operations/region-failover.md
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
docs/nightly/en/user-guide/operations/configuration.md
[uncategorized] ~361-~361: Loose punctuation mark.
Context: ...line = "5mins" ``` -broker_endpoints: The Kafka broker endpoints. - `max_batc...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~362-~362: Loose punctuation mark.
Context: ...ka broker endpoints. -max_batch_bytes: The max size of a single producer batch...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~363-~363: Loose punctuation mark.
Context: ...roducer batch. -consumer_wait_timeout: The consumer wait timeout. - `backoff_i...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~364-~364: Loose punctuation mark.
Context: ... consumer wait timeout. -backoff_init: The initial backoff delay. - `backoff_m...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~365-~365: Loose punctuation mark.
Context: ...e initial backoff delay. -backoff_max: The maximum backoff delay. - `backoff_b...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~366-~366: Loose punctuation mark.
Context: ... maximum backoff delay. -backoff_base: The exponential backoff rate. - `backof...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~367-~367: Loose punctuation mark.
Context: ...ntial backoff rate. -backoff_deadline: The deadline of retries. ### Logging o...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~443-~443: Possible missing comma found.
Context: .... If not set, it's default to 1/8 of OS memory with a max limitation of 1GB. ...(AI_HYDRA_LEO_MISSING_COMMA)
Additional comments not posted (7)
docs/nightly/en/user-guide/operations/region-failover.md (3)
1-3: Introduction to Region Failover looks good.The section clearly introduces Region Failover and provides a useful link to Region Migration.
14-15: Configuration file instructions look good.The section clearly explains how to enable Region Failover via the configuration file.
17-24: GreptimeDB Operator instructions look good.The section clearly explains how to enable Region Failover via GreptimeDB Operator using Helm.
docs/nightly/en/user-guide/operations/configuration.md (4)
288-288: Storage options section looks good.The section clearly lists storage options for various storage types.
368-368: Logging options section looks good.The section clearly lists logging options for various components.
426-426: Region engine options section looks good.The section clearly lists options for the
mitoregion engine.
568-612: Metasrv-only configuration section looks good.The section clearly lists configuration options specific to
metasrv.
There was a problem hiding this comment.
Actionable comments posted: 3
Outside diff range, codebase verification and nitpick comments (1)
docs/nightly/en/user-guide/operations/region-failover.md (1)
26-36: Consider further explaining the factors affecting recovery time.The section could benefit from a more detailed explanation of how the number of regions per topic and Kafka cluster read throughput performance affect recovery time.
- The recovery time of Region Failover depends on: + The recovery time of Region Failover depends on several factors, including: + + - The number of regions per Topic: More regions per topic can increase the recovery time due to higher read amplification. + - The Kafka cluster read throughput performance: Higher throughput can reduce the recovery time by allowing faster data replay.
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files ignored due to path filters (1)
docs/public/remote-wal-read-amplification.pngis excluded by!**/*.png
Files selected for processing (4)
- docs/auto-imports.d.ts (1 hunks)
- docs/nightly/en/summary.yml (1 hunks)
- docs/nightly/en/user-guide/operations/configuration.md (8 hunks)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
Files skipped from review as they are similar to previous changes (2)
- docs/auto-imports.d.ts
- docs/nightly/en/summary.yml
Additional context used
LanguageTool
docs/nightly/en/user-guide/operations/region-failover.md
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
docs/nightly/en/user-guide/operations/configuration.md
[uncategorized] ~316-~316: Loose punctuation mark.
Context: ...line = "5mins" ``` -broker_endpoints: The Kafka broker endpoints. - `max_batc...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~317-~317: Loose punctuation mark.
Context: ...ka broker endpoints. -max_batch_bytes: The max size of a single producer batch...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~318-~318: Loose punctuation mark.
Context: ...roducer batch. -consumer_wait_timeout: The consumer wait timeout. - `backoff_i...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~319-~319: Loose punctuation mark.
Context: ... consumer wait timeout. -backoff_init: The initial backoff delay. - `backoff_m...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~320-~320: Loose punctuation mark.
Context: ...e initial backoff delay. -backoff_max: The maximum backoff delay. - `backoff_b...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~321-~321: Loose punctuation mark.
Context: ... maximum backoff delay. -backoff_base: The exponential backoff rate. - `backof...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~322-~322: Loose punctuation mark.
Context: ...ntial backoff rate. -backoff_deadline: The deadline of retries. ### Logging o...(UNLIKELY_OPENING_PUNCTUATION)
Additional comments not posted (10)
docs/nightly/en/user-guide/operations/region-failover.md (4)
1-3: Introduction is clear and concise.The introduction to Region Failover is well-written and provides a useful link to Region Migration.
38-48: Explanation of read amplification is clear and useful.The section provides a clear explanation of read amplification and includes a helpful example.
50-52: Warning note is clear and necessary.The warning note about the potential for higher read amplification in actual scenarios is clear and necessary.
54-79: Examples are clear and useful.The examples of read amplification factors and recovery times are clear and provide useful information.
docs/nightly/en/user-guide/operations/configuration.md (6)
243-243: Storage options section is clear and useful.The section provides a comprehensive overview of storage options and detailed configurations for different storage types.
Line range hint
285-323:
WAL options section is clear and useful.The section provides a comprehensive overview of Local and Remote WAL options and detailed configurations.
Tools
LanguageTool
[uncategorized] ~300-~300: Loose punctuation mark.
Context: ... files, default is4GB. -sync_write: whether to callfsyncwhen writing ev...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~316-~316: Loose punctuation mark.
Context: ...line = "5mins" ``` -broker_endpoints: The Kafka broker endpoints. - `max_batc...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~317-~317: Loose punctuation mark.
Context: ...ka broker endpoints. -max_batch_bytes: The max size of a single producer batch...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~318-~318: Loose punctuation mark.
Context: ...roducer batch. -consumer_wait_timeout: The consumer wait timeout. - `backoff_i...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~319-~319: Loose punctuation mark.
Context: ... consumer wait timeout. -backoff_init: The initial backoff delay. - `backoff_m...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~320-~320: Loose punctuation mark.
Context: ...e initial backoff delay. -backoff_max: The maximum backoff delay. - `backoff_b...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~321-~321: Loose punctuation mark.
Context: ... maximum backoff delay. -backoff_base: The exponential backoff rate. - `backof...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~322-~322: Loose punctuation mark.
Context: ...ntial backoff rate. -backoff_deadline: The deadline of retries. ### Logging o...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~326-~326: Loose punctuation mark.
Context: ...etries. ### Logging optionsfrontend,metasrv,datanodeandstandalone...(UNLIKELY_OPENING_PUNCTUATION)
Line range hint
324-344:
Logging options section is clear and useful.The section provides a comprehensive overview of logging options and detailed configurations.
Tools
LanguageTool
[uncategorized] ~300-~300: Loose punctuation mark.
Context: ... files, default is4GB. -sync_write: whether to callfsyncwhen writing ev...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~316-~316: Loose punctuation mark.
Context: ...line = "5mins" ``` -broker_endpoints: The Kafka broker endpoints. - `max_batc...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~317-~317: Loose punctuation mark.
Context: ...ka broker endpoints. -max_batch_bytes: The max size of a single producer batch...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~318-~318: Loose punctuation mark.
Context: ...roducer batch. -consumer_wait_timeout: The consumer wait timeout. - `backoff_i...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~319-~319: Loose punctuation mark.
Context: ... consumer wait timeout. -backoff_init: The initial backoff delay. - `backoff_m...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~320-~320: Loose punctuation mark.
Context: ...e initial backoff delay. -backoff_max: The maximum backoff delay. - `backoff_b...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~321-~321: Loose punctuation mark.
Context: ... maximum backoff delay. -backoff_base: The exponential backoff rate. - `backof...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~322-~322: Loose punctuation mark.
Context: ...ntial backoff rate. -backoff_deadline: The deadline of retries. ### Logging o...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~326-~326: Loose punctuation mark.
Context: ...etries. ### Logging optionsfrontend,metasrv,datanodeandstandalone...(UNLIKELY_OPENING_PUNCTUATION)
Line range hint
345-380:
Region engine options section is clear and useful.The section provides a comprehensive overview of region engine options and detailed configurations for the
mitoengine.
Line range hint
381-389:
Meta client options section is clear and useful.The section provides a comprehensive overview of meta client options and detailed configurations.
Line range hint
390-409:
Monitor metrics options section is clear and useful.The section provides a comprehensive overview of monitor metrics options and detailed configurations.
The definition is as follows:
I added a section about enabling failover.
Updated: the definition is as follows:
Replay: Reconstruct memory state from the WAL.
Kill a Datanode in the cluster, and the regions belonging to the Killed Datanode will be migrated to another Datanode. |
There was a problem hiding this comment.
Caution
Inline review comments failed to post
Actionable comments posted: 2
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (2)
- docs/nightly/en/user-guide/operations/configuration.md (8 hunks)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
Additional context used
LanguageTool
docs/nightly/en/user-guide/operations/region-failover.md
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
docs/nightly/en/user-guide/operations/configuration.md
[uncategorized] ~316-~316: Loose punctuation mark.
Context: ...line = "5mins" ``` -broker_endpoints: The Kafka broker endpoints. - `max_batc...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~317-~317: Loose punctuation mark.
Context: ...ka broker endpoints. -max_batch_bytes: The max size of a single producer batch...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~318-~318: Loose punctuation mark.
Context: ...roducer batch. -consumer_wait_timeout: The consumer wait timeout. - `backoff_i...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~319-~319: Loose punctuation mark.
Context: ... consumer wait timeout. -backoff_init: The initial backoff delay. - `backoff_m...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~320-~320: Loose punctuation mark.
Context: ...e initial backoff delay. -backoff_max: The maximum backoff delay. - `backoff_b...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~321-~321: Loose punctuation mark.
Context: ... maximum backoff delay. -backoff_base: The exponential backoff rate. - `backof...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~322-~322: Loose punctuation mark.
Context: ...ntial backoff rate. -backoff_deadline: The deadline of retries. ### Logging o...(UNLIKELY_OPENING_PUNCTUATION)
Additional comments not posted (8)
docs/nightly/en/user-guide/operations/region-failover.md (4)
14-24: LGTM!The instructions for enabling Region Failover via configuration file and GreptimeDB Operator are clear and concise.
26-36: LGTM!The section on recovery time of Region Failover is well-written and provides useful information on recovery time factors.
38-48: LGTM!The section on read amplification is clear and the example configuration is helpful.
69-79: LGTM!The section on more examples is useful and the table is well-formatted.
docs/nightly/en/user-guide/operations/configuration.md (4)
156-180: LGTM!The section on protocol options is well-formatted and the descriptions are clear.
243-243: LGTM!The section on storage options is well-formatted and the descriptions are clear.
Line range hint
285-323:
LGTM!The section on WAL options is detailed and clear.
Tools
LanguageTool
[uncategorized] ~300-~300: Loose punctuation mark.
Context: ... files, default is4GB. -sync_write: whether to callfsyncwhen writing ev...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~316-~316: Loose punctuation mark.
Context: ...line = "5mins" ``` -broker_endpoints: The Kafka broker endpoints. - `max_batc...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~317-~317: Loose punctuation mark.
Context: ...ka broker endpoints. -max_batch_bytes: The max size of a single producer batch...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~318-~318: Loose punctuation mark.
Context: ...roducer batch. -consumer_wait_timeout: The consumer wait timeout. - `backoff_i...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~319-~319: Loose punctuation mark.
Context: ... consumer wait timeout. -backoff_init: The initial backoff delay. - `backoff_m...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~320-~320: Loose punctuation mark.
Context: ...e initial backoff delay. -backoff_max: The maximum backoff delay. - `backoff_b...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~321-~321: Loose punctuation mark.
Context: ... maximum backoff delay. -backoff_base: The exponential backoff rate. - `backof...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~322-~322: Loose punctuation mark.
Context: ...ntial backoff rate. -backoff_deadline: The deadline of retries. ### Logging o...(UNLIKELY_OPENING_PUNCTUATION)
[uncategorized] ~326-~326: Loose punctuation mark.
Context: ...etries. ### Logging optionsfrontend,metasrv,datanodeandstandalone...(UNLIKELY_OPENING_PUNCTUATION)
Line range hint
324-380:
LGTM!The section on logging options is detailed and clear.
Comments failed to post (2)
docs/nightly/en/user-guide/operations/region-failover.md
7-7: Fix repeated word in the warning message.
There is a repeated word "Warning" in the warning message.
- :::warning Warning + :::warningCommittable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.:::warningTools
LanguageTool
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
docs/nightly/en/user-guide/operations/configuration.md
570-590: Fix repeated key in the table.
There is a repeated key
enable_region_failoverin the table.- | `enable_region_failover` | Bool | `false` | Whether to enable region failover.<br/>This feature is only available on GreptimeDB running on cluster mode and<br/>- Using Remote WAL<br/>- Using shared storage (e.g., s3). |Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.| Key | Type | Default | Descriptions | | -------------------------- | ------- | ---------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `data_home` | String | `/tmp/metasrv/` | The working home directory. | | `bind_addr` | String | `127.0.0.1:3002` | The bind address of metasrv. | | `server_addr` | String | `127.0.0.1:3002` | The communication server address for frontend and datanode to connect to metasrv, "127.0.0.1:3002" by default for localhost. | | `store_addr` | String | `127.0.0.1:2379` | Etcd server address. | | `selector` | String | `lease_based` | Datanode selector type.<br/>- `lease_based` (default value).<br/>- `load_based`<br/>For details, see [Selector](/contributor-guide/metasrv/selector.md) | | `use_memory_store` | Bool | `false` | Store data in memory. | | `enable_region_failover` | Bool | `false` | Whether to enable region failover.<br/>This feature is only available on GreptimeDB running on cluster mode and<br/>- Using Remote WAL<br/>- Using shared storage (e.g., s3). | | `wal` | -- | -- | -- | | `wal.provider` | String | `raft_engine` | -- | | `wal.broker_endpoints` | Array | -- | The broker endpoints of the Kafka cluster. | | `wal.num_topics` | Integer | `64` | Number of topics to be created upon start. | | `wal.selector_type` | String | `round_robin` | Topic selector type.<br/>Available selector types:<br/>- `round_robin` (default) | | `wal.topic_name_prefix` | String | `greptimedb_wal_topic` | A Kafka topic is constructed by concatenating `topic_name_prefix` and `topic_id`. | | `wal.replication_factor` | Integer | `1` | Expected number of replicas of each partition. | | `wal.create_topic_timeout` | String | `30s` | Above which a topic creation operation will be cancelled. | | `wal.backoff_init` | String | `500ms` | The initial backoff for kafka clients. | | `wal.backoff_max` | String | `10s` | The maximum backoff for kafka clients. | | `wal.backoff_base` | Integer | `2` | Exponential backoff rate, i.e. next backoff = base \* current backoff. | | `wal.backoff_deadline` | String | `5mins` | Stop reconnecting if the total wait time reaches the deadline. If this config is missing, the reconnecting won't terminate. |
There was a problem hiding this comment.
Actionable comments posted: 2
Outside diff range, codebase verification and nitpick comments (3)
docs/nightly/en/user-guide/operations/region-failover.md (3)
15-15: Clarify the configuration setting.The configuration setting should be more explicit about where to place the
enable_region_failover=trueline.- Set the `enable_region_failover=true` in [metasrv](/user-guide/operations/configuration.md#metasrv-only-configuration) configuration file. + Add `enable_region_failover=true` under the `[metasrv]` section in the [metasrv](/user-guide/operations/configuration.md#metasrv-only-configuration) configuration file.
26-36: Clarify the factors affecting recovery time.The explanation of factors affecting recovery time could be more detailed.
- The recovery time of Region Failover depends on: + The recovery time of Region Failover is influenced by several factors:
56-57: Clarify the amplification factor calculation.The calculation of the amplification factor should be more explicit.
- For a single topic, the amplification factor is 1 + 2 + ... + 7 = 28 times (Region WAL data distribution is shown in the Figure 1). + For a single topic, the amplification factor is the sum of the series 1 + 2 + ... + 7, which equals 28 times (Region WAL data distribution is shown in Figure 1).
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (1)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
Additional context used
LanguageTool
docs/nightly/en/user-guide/operations/region-failover.md
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
Additional comments not posted (2)
docs/nightly/en/user-guide/operations/region-failover.md (2)
50-50: Fix the note formatting.The note should use the correct formatting for a warning.
- :::warning Note + :::noteLikely invalid or redundant comment.
7-7: Fix repeated word in the warning message.There is a repeated word "Warning" in the warning message.
- :::warning Warning + :::warningLikely invalid or redundant comment.
Tools
LanguageTool
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
Co-authored-by: Yiran <cuiyiran3@gmail.com>
Co-authored-by: Yiran <cuiyiran3@gmail.com>
Co-authored-by: Yiran <cuiyiran3@gmail.com>
There was a problem hiding this comment.
Actionable comments posted: 3
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files ignored due to path filters (1)
docs/public/remote-wal-read-amplification.pngis excluded by!**/*.png
Files selected for processing (1)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
Additional context used
LanguageTool
docs/nightly/en/user-guide/operations/region-failover.md
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
Additional comments not posted (5)
docs/nightly/en/user-guide/operations/region-failover.md (5)
1-3: Introduction is clear and concise.The introduction to Region Failover is well-written and provides a clear link to Region Migration.
14-24: Instructions for enabling Region Failover are clear.The instructions for enabling Region Failover via configuration file and GreptimeDB Operator are well-written and provide necessary details.
26-36: Explanation of recovery time factors is clear.The section provides a clear explanation of the factors affecting the recovery time of Region Failover and includes a helpful note on best practices.
80-84: Suggestions for improving recovery time are clear.The section provides clear and useful suggestions for improving recovery time.
56-64: Fix typographical errors in the table headers.There are typographical errors in the table headers for recovery time.
- | Number of regions per Topic | Number of topics required for 100 Regions | Single topic read amplification factor | Total reading amplification factor | Replay data size (GB) | + | Number of regions per Topic | Number of topics required for 100 Regions | Single topic read amplification factor | Total reading amplification factor | Replay data size (GB) |Likely invalid or redundant comment.
There was a problem hiding this comment.
Actionable comments posted: 0
Outside diff range, codebase verification and nitpick comments (6)
docs/nightly/en/user-guide/operations/region-migration.md (1)
6-6: Fix preposition in the warning message.The preposition "on" should be replaced with "in" for correct grammar.
- This feature is only available on GreptimeDB running on distributed mode and + This feature is only available in GreptimeDB running on distributed mode andTools
LanguageTool
[uncategorized] ~6-~6: The preposition ‘in’ seems more likely in this position.
Context: ...is only available on GreptimeDB running on distributed mode and - Using Kafka WAL...(AI_HYDRA_LEO_REPLACE_ON_IN)
docs/nightly/en/user-guide/operations/region-failover.md (5)
9-9: Fix preposition in the warning message.The preposition "on" should be replaced with "in" for correct grammar.
- This feature is only available on GreptimeDB running on distributed mode and + This feature is only available in GreptimeDB running on distributed mode and
7-7: Fix repeated word in the warning message.There is a repeated word "Warning" in the warning message.
- :::warning Warning + :::warningTools
LanguageTool
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
41-41: Consider making the explanation of read amplification more concise.The explanation is clear and well-explained, but it could be made more concise for better readability.
- The data belonging to a specific region consists of data files plus data in the WAL (typically `WAL[LastCheckpoint...Latest]`). The failover of a specific region only requires reading the region's WAL data to reconstruct the memory state, which is called region replaying. However, If multiple regions share a single topic, replaying data for a specific region from the topic requires filtering out unrelated data (i.e., data from other regions). **This means replaying data for a specific region from the topic requires reading more data than the actual size of the region's data in the topic, a phenomenon known as read amplification**. + The data belonging to a specific region consists of data files plus data in the WAL (typically `WAL[LastCheckpoint...Latest]`). Region failover requires reading the WAL data to reconstruct the memory state, known as region replaying. However, if multiple regions share a single topic, replaying data for a specific region requires filtering out unrelated data. **This results in reading more data than the actual size of the region's data, a phenomenon known as read amplification**.
70-70: Fix typographical errors in the table headers.There are typographical errors in the table headers for recovery time.
- | Number of regions per Topic | Replay data size (GB) | Kafka throughput 300MB/s- Reovery time (secs) | Kafka throughput 1000MB/s- Reovery time (secs) | + | Number of regions per Topic | Replay data size (GB) | Kafka throughput 300MB/s - Recovery time (secs) | Kafka throughput 1000MB/s - Recovery time (secs) |
78-78: Fix typographical error.There is a typographical error in the note.
- \*: Assuming the unflushed data size is 0.5GB. + \*: Assumes the unflushed data size is 0.5GB.
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (2)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
- docs/nightly/en/user-guide/operations/region-migration.md (1 hunks)
Additional context used
LanguageTool
docs/nightly/en/user-guide/operations/region-migration.md
[uncategorized] ~6-~6: The preposition ‘in’ seems more likely in this position.
Context: ...is only available on GreptimeDB running on distributed mode and - Using Kafka WAL...(AI_HYDRA_LEO_REPLACE_ON_IN)
docs/nightly/en/user-guide/operations/region-failover.md
[duplication] ~7-~7: Possible typo: you repeated a word
Context: ...on). ## Enable the Region Failover :::warning Warning This feature is only available on Grept...(ENGLISH_WORD_REPEAT_RULE)
There was a problem hiding this comment.
Actionable comments posted: 0
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (2)
- docs/.vitepress/config/setting.json (1 hunks)
- docs/nightly/zh/user-guide/operations/region-failover.md (1 hunks)
Files skipped from review due to trivial changes (1)
- docs/.vitepress/config/setting.json
Additional comments not posted (10)
docs/nightly/zh/user-guide/operations/region-failover.md (10)
3-3: Clear introduction to Region Failover.The opening line succinctly introduces the concept of Region Failover and its implementation via Region Migration.
7-12: Important warning about feature availability.The warning box clearly states the prerequisites for using the Region Failover feature, which is crucial information for users. It's good practice to highlight such prerequisites to avoid configuration errors.
16-16: Configuration instructions are clear.The instructions on how to enable Region Failover through the configuration file are straightforward and easy to follow.
20-26: Example usage of GreptimeDB Operator is helpful.Providing a concrete example of how to enable the feature using the GreptimeDB Operator enhances usability and assists users in practical implementation.
30-34: Explanation of factors affecting recovery time.The section explaining the factors that affect the recovery time of Region Failover is informative. It helps users understand the dependencies and performance considerations.
37-39: Useful note on Kafka cluster limitations.The note on the limitations of Kafka cluster's support for topics/partitions is valuable. It provides context on why multiple regions might share a single topic and the potential performance implications.
43-46: Detailed explanation of read amplification.The explanation of read amplification is detailed and clearly describes the challenges associated with region replaying when multiple regions share a single topic. This is crucial for understanding the trade-offs of the current system design.
53-66: Model for estimating read amplification is insightful.The model provided for estimating read amplification offers a clear, quantitative understanding of the impact of shared topics on data redundancy during recovery. This detailed breakdown enhances the document's technical depth.
66-66: Practical example of recovery time calculation.The calculation example that translates the read amplification into actual recovery time (using a given Kafka throughput) is a practical addition that helps users gauge the operational implications.
81-85: Suggestions for improving recovery time are proactive.The final section offers actionable suggestions for improving recovery times based on different configurations. This proactive approach is beneficial for users looking to optimize their setups.
There was a problem hiding this comment.
Actionable comments posted: 0
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (1)
- docs/nightly/zh/user-guide/operations/region-failover.md (1 hunks)
Files skipped from review as they are similar to previous changes (1)
- docs/nightly/zh/user-guide/operations/region-failover.md
There was a problem hiding this comment.
Actionable comments posted: 3
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (2)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
- docs/nightly/zh/user-guide/operations/region-failover.md (1 hunks)
Files skipped from review as they are similar to previous changes (1)
- docs/nightly/zh/user-guide/operations/region-failover.md
Additional context used
LanguageTool
docs/nightly/en/user-guide/operations/region-failover.md
[uncategorized] ~7-~7: The preposition ‘in’ seems more likely in this position.
Context: ...is only available on GreptimeDB running on distributed mode and - Using Kafka WAL...(AI_HYDRA_LEO_REPLACE_ON_IN)
[grammar] ~53-~53: With the quantifier ‘all’, the plural form may be more appropriate here.
Context: ...ecover, and the actual data size of all region is 0.5GB, the following table shows the...(OF_ALL_PLURAL)
Additional comments not posted (4)
docs/nightly/en/user-guide/operations/region-failover.md (4)
1-23: Clear and informative introduction to Region Failover.The section effectively introduces the Region Failover feature and provides clear instructions on how to enable it.
Tools
LanguageTool
[uncategorized] ~7-~7: The preposition ‘in’ seems more likely in this position.
Context: ...is only available on GreptimeDB running on distributed mode and - Using Kafka WAL...(AI_HYDRA_LEO_REPLACE_ON_IN)
24-40: Well-explained recovery time and read amplification concepts.The section provides a detailed explanation of how recovery time is affected by various factors and introduces the concept of read amplification clearly.
41-45: Effective use of visual aids to explain read amplification.The inclusion of a diagram and a concise explanation enhances the understanding of read amplification.
75-81: Practical suggestions for improving recovery time.The section offers actionable advice for optimizing recovery time, directly addressing the issues discussed earlier in the document.
There was a problem hiding this comment.
Actionable comments posted: 3
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (1)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
Additional context used
LanguageTool
docs/nightly/en/user-guide/operations/region-failover.md
[uncategorized] ~7-~7: The preposition ‘in’ seems more likely in this position.
Context: ...is only available on GreptimeDB running on distributed mode and - Using Kafka WAL...(AI_HYDRA_LEO_REPLACE_ON_IN)
Additional comments not posted (1)
docs/nightly/en/user-guide/operations/region-failover.md (1)
66-66: Fix typographical errors in the table headers.Correct the spelling of "Reovery" to "Recovery" in the table headers to maintain professionalism.
- | Number of regions per Topic | Replay data size (GB) | Kafka throughput 300MB/s- Reovery time (secs) | Kafka throughput 1000MB/s- Reovery time (secs) | + | Number of regions per Topic | Replay data size (GB) | Kafka throughput 300MB/s - Recovery time (secs) | Kafka throughput 1000MB/s - Recovery time (secs) |Likely invalid or redundant comment.
There was a problem hiding this comment.
Actionable comments posted: 0
Outside diff range, codebase verification and nitpick comments (2)
docs/nightly/zh/user-guide/operations/configuration.md (2)
Review Local WAL settings for completeness and correctness.
The Local WAL settings are mostly complete, but there are a couple of minor issues:
read_batch_sizeis not explained in the list of parameters.- The description for
sync_writecontains a typo ("lfsync" should be "fsync").Please add the missing explanation for
read_batch_sizeand correct the typo in thesync_writedescription.
read_batch_size: The number of log entries to read in a single batch, default is 128.
sync_write: 是否在写入每条日志的时候调用fsync刷盘。Analysis chain
Line range hint
274-290: Review Local WAL settings for completeness and correctness.The Local WAL settings have been detailed correctly. Please ensure that all parameters are explained sufficiently and that the descriptions are clear and concise.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check for completeness of Local WAL settings descriptions. rg --type md --context 10 "Local WAL" docs/nightly/zh/user-guide/operations/configuration.mdLength of output: 440
Script:
#!/bin/bash # Description: Search for all occurrences of [wal] in the file to ensure completeness and correctness of Local WAL settings. rg --type md --context 10 '\[wal\]' docs/nightly/zh/user-guide/operations/configuration.mdLength of output: 1736
293-312: Ensure thereplication_factorsetting for Kafka WAL is documented.The
replication_factorsetting is present in other documentation files but missing indocs/nightly/zh/user-guide/operations/configuration.md. Please add this setting to ensure the documentation is complete.
replication_factor: 每个 partition 的数据会复制到指定数量的 brokers 上。该配置项的值必须大于 0，且不大于 brokers 的数量。Analysis chain
Ensure new settings for Remote WAL are documented correctly.
The addition of Kafka as a WAL provider introduces several new settings. It's crucial to ensure that each setting is accurately described and that the default values and behavior are clearly stated.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the accuracy and completeness of the Kafka WAL settings documentation. rg --type md --context 10 "Remote WAL" docs/nightly/zh/user-guide/operations/configuration.mdLength of output: 1375
Script:
#!/bin/bash # Description: Search for all occurrences of Kafka WAL settings in the documentation to verify completeness and accuracy. rg --type md "provider = \"kafka\"" -A 10Length of output: 7178
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (2)
- docs/nightly/en/user-guide/operations/region-failover.md (1 hunks)
- docs/nightly/zh/user-guide/operations/configuration.md (6 hunks)
Files skipped from review as they are similar to previous changes (1)
- docs/nightly/en/user-guide/operations/region-failover.md
Additional comments not posted (4)
docs/nightly/zh/user-guide/operations/configuration.md (4)
158-158: Correct typographical error inaddrformysqlsection.The correction from
addtoaddrfixes a typographical error, ensuring the documentation is accurate.
152-152: Ensure proper translation and consistency foris_strict_modein HTTP section.The translation for
is_strict_modehas been updated. Please verify that the translation aligns correctly with the intended meaning and consistency across the document.Verification successful
Translation for
is_strict_modeis consistent and correct.The translation for
is_strict_modein the HTTP section is accurate and there are no inconsistencies found in the document.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Search for all occurrences of `is_strict_mode` to ensure consistency in translation and usage. rg --type md --context 5 "is_strict_mode" docs/nightly/zh/user-guide/operations/configuration.mdLength of output: 1150
515-520: Confirm the conditions for enabling region failover.The documentation specifies conditions under which region failover can be enabled. It's important to confirm that these conditions are accurately reflected across all relevant documentation sections.
Verification successful
The conditions for enabling region failover are accurately reflected across all relevant documentation sections.
docs/nightly/zh/user-guide/operations/configuration.mddocs/nightly/en/user-guide/operations/region-failover.mdScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Confirm the accuracy of the conditions for enabling region failover. rg --type md --context 10 "enable_region_failover" docs/nightly/zh/user-guide/operations/configuration.mdLength of output: 4363
Script:
#!/bin/bash # Description: Confirm the accuracy of the conditions for enabling region failover across all markdown files. rg --type md --context 10 "enable_region_failover"Length of output: 17950
381-402: Validate the new configurations forregion_engine.The new settings under
region_engineneed thorough validation to ensure they are correctly documented, especially the default values and descriptions.
There was a problem hiding this comment.
Actionable comments posted: 0
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (4)
- docs/nightly/en/summary.yml (1 hunks)
- docs/nightly/zh/summary-i18n.yml (1 hunks)
- docs/nightly/zh/user-guide/operations/configuration.md (6 hunks)
- docs/nightly/zh/user-guide/overview.md (1 hunks)
Files skipped from review due to trivial changes (2)
- docs/nightly/zh/summary-i18n.yml
- docs/nightly/zh/user-guide/overview.md
Files skipped from review as they are similar to previous changes (2)
- docs/nightly/en/summary.yml
- docs/nightly/zh/user-guide/operations/configuration.md
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com> Co-authored-by: Yiran <cuiyiran3@gmail.com>
What's Changed in this PR
Checklist
summary.ymlmatches the current document structure when you changed the document structure.Summary by CodeRabbit
Documentation
LATEST_VERSIONto "nightly" in VitePress configuration.Bug Fixes