HDFS-17737. Implement Backoff Retry for ErasureCoding reads

[dannytbecker]

Description of PR

Currently EC Reads are less stable than replication reads because if 4 out of 9 datanodes in the block group are unable to connect, then the whole read fails. Erasure Coding reads need to be able to handle disconnects from DataNodes and retry after a backoff duration to avoid overloading the DataNodes while increasing the stability of the read.

Throttling on server side was another proposed solution, but we prefer this client side backoff for a few main reasons:

1. Throttling on the server would use up thread connections which have a maximum limit.
2. Throttling was originally added only for cohosting scenario to reduce impact on other services
3. Throttling would use up resources on the DataNode which could already be in a bad state.

What

The previous implementation followed a 4 phase algorithm to read.

1. Attempt to read chunks from the data blocks
2. Check for missing data chunks. Fail if there are more missing than the number of parity blocks, otherwise read parity blocks and null data blocks
3. Wait for data to be read into the buffers and handle any read errors by reading from more parity blocks
4. Check for missing blocks and either decode or fail.

The new implementation now merges phase 1-3 into a single loop:

1. Loop until we have enough blocks for read or decode, or we have too many missing blocks to succeed
   • Determine the number of chunks we need to fetch. ALLZERO chunks count towards this total. null data chunks also count towards this total unless there are MISSING or SLEEPING data chunks.
   • Read chunks until we have enough pending or fetched to be able to decode or normal read.
     faster.
   • Get results from reads and handle exceptions by preparing more reads for decoding the missing data
   • Check if we should sleep before retrying any reads.
2. Check for missing blocks and either decode or fail.

Add two new states to StripingChunk:

• "SLEEPING" to indicate that the node where the chunk is stored has failed and will be retried in the future
• "READY" to indicate that the node where the chunk is stored is ready to be attempted

How was this patch tested?

Add unit test to TestWriteReadStripedFile

• Covers RS(3,2) with 1 chunk on failed nodes, 2 chunks on failed nodes, and 3 chunks on failed nodes.

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 32s		Docker mode activated.
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+1 💚	test4tests	0m 0s		The patch appears to include 4 new or modified test files.
			_ trunk Compile Tests _
+0 🆗	mvndep	6m 28s		Maven dependency ordering for branch
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			_ Patch Compile Tests _
+0 🆗	mvndep	0m 31s		Maven dependency ordering for patch
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-1 ❌	javac	0m 39s	/patch-compile-hadoop-hdfs-project-jdkUbuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04.txt	hadoop-hdfs-project in the patch failed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04.
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-1 ❌	javadoc	0m 31s	/results-javadoc-javadoc-hadoop-hdfs-project_hadoop-hdfs-client-jdkPrivateBuild-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06.txt	hadoop-hdfs-project_hadoop-hdfs-client-jdkPrivateBuild-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06 with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06 generated 1 new + 0 unchanged - 0 fixed = 1 total (was 0)
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-1 ❌	shadedclient	14m 33s		patch has errors when building and testing our client artifacts.
			_ Other Tests _
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-1 ❌	unit	0m 55s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch failed.
+1 💚	asflicense	0m 29s		The patch does not generate ASF License warnings.
		121m 18s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/1/artifact/out/Dockerfile
GITHUB PR	#7427
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets xmllint
uname	Linux 3489e4b60808 5.15.0-131-generic #141-Ubuntu SMP Fri Jan 10 21:18:28 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
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Default Java	Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
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Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/1/testReport/
Max. process+thread count	634 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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			_ Prechecks _
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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
+0 🆗	mvndep	1m 4s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 52s		the patch passed
+1 💚	compile	5m 30s		the patch passed with JDK Ubuntu-11.0.26+4-post-Ubuntu-1ubuntu120.04
+1 💚	javac	5m 30s		the patch passed
+1 💚	compile	4m 56s		the patch passed with JDK Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
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			_ Other Tests _
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+1 💚	unit	1m 37s		hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 39s		The patch does not generate ASF License warnings.
		169m 11s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/2/artifact/out/Dockerfile
GITHUB PR	#7427
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets xmllint
uname	Linux a7d3890341e6 5.15.0-131-generic #141-Ubuntu SMP Fri Jan 10 21:18:28 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
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Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/2/testReport/
Max. process+thread count	724 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/2/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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💔 -1 overall

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			_ Prechecks _
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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
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+1 💚	unit	1m 31s		hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 38s		The patch does not generate ASF License warnings.
		163m 29s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/3/artifact/out/Dockerfile
GITHUB PR	#7427
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets xmllint
uname	Linux f6e48fec9172 5.15.0-131-generic #141-Ubuntu SMP Fri Jan 10 21:18:28 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
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Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/3/testReport/
Max. process+thread count	568 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/3/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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+0 🆗	reexec	0m 31s		Docker mode activated.
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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
+0 🆗	mvndep	0m 34s		Maven dependency ordering for patch
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			_ Other Tests _
+1 💚	unit	2m 30s		hadoop-hdfs-client in the patch passed.
+1 💚	unit	1m 31s		hadoop-hdfs in the patch passed.
+1 💚	asflicense	0m 37s		The patch does not generate ASF License warnings.
		164m 38s

Subsystem	Report/Notes
Docker	ClientAPI=1.48 ServerAPI=1.48 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/4/artifact/out/Dockerfile
GITHUB PR	#7427
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient codespell detsecrets xmllint spotbugs checkstyle
uname	Linux dccdc7ce188b 5.15.0-131-generic #141-Ubuntu SMP Fri Jan 10 21:18:28 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / e8339b0
Default Java	Private Build-1.8.0_442-8u442-b06us1-0ubuntu120.04-b06
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Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/4/testReport/
Max. process+thread count	700 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7427/4/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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