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No index information when host configured in elasticsearch_hosts is unreachable (but elastic cluster is not red) #3993

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fadenb opened this issue Jul 12, 2017 · 0 comments
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fadenb commented Jul 12, 2017

Expected Behavior

I configured elasticsearch_hosts with 8 elastic hosts:

elasticsearch_hosts = http://backend01-int:9200,http://backend02-int:9200,http://backend03-int:9200,http://backend04-int:9200,http://backend05-int:9200,http://backend06-int:9200,http://backend07-int:9200,http://backend08-int:9200

When 1 elastic node went offline (stoped elasticsearch for test purposes) graylog was unable to display the "indices" page and displayed a warning that I should check that the elastic cluster is reachable.

As the cluster was only in yellow state (and shortly after green) I expected graylog to be able to still display index information. During the whole time graylog was able to output logs and search them.

Current Behavior

An error message is displayed telling me to ensure the elastic cluster is reachable.

Possible Solution

As advised by Joschi on irc:

  • Configure only 1 elastic node per elasticsearch_hosts
  • Enable elasticsearch_discovery_enabled
  • Graylog will show connection refused message in the console but work fine
    • Log now shows a pool of available servers
io.searchbox.client.AbstractJestClient - Setting server pool to a list of 6 servers: [http://10.20.30.4:9200,http://10.20.30.8:9200,http://10.20.30.5:9200,http://10.20.30.3:9200,http://10.20.30.1:9200,http://10.20.30.2:9200]

Steps to Reproduce (for bugs)

  1. Configure multiple elastic nodes in elasticsearch_hosts
  2. Use graylog as you would usually do
  3. Stop 1 elastic server
  4. Try to open https://graylog.some.tld/system/index_sets/<some_id>
  5. See error message (graylog console: https://gist.githubusercontent.com/fadenb/6aa5b7f4bbfdcdf99e4c03a29b6e2b61/raw/b954406c496c8d14b86c358879e9b89181cece9e/graylog.log )

Context

Your Environment

  • Graylog Version: Graylog 2.3.0-rc.1+8077842
  • Elasticsearch Version: 5.4.2 build[929b078/2017-06-15T02:29:28.122Z]
  • MongoDB Version: 3.2.9
  • Operating System: NixOs 17.09
@joschi joschi self-assigned this Jul 12, 2017
@joschi joschi added this to the 2.3.0 milestone Jul 13, 2017
joschi pushed a commit that referenced this issue Jul 14, 2017
Jest now retries failed Elasticsearch requests a configurable number of times (default: 2)
until it gives up.

Unfortunately, the retry implementations in Apache Http Client via `HttpRequestRetryHandler`
couldn't be used because they don't allow changing the request (or at least the request URI)
between retries which is necessary to use all configured servers in the server pool.

Fixes #3993
@ghost ghost added the in progress label Jul 14, 2017
@ghost ghost removed the in progress label Jul 17, 2017
bernd pushed a commit that referenced this issue Jul 17, 2017
Jest now retries failed Elasticsearch requests a configurable number of times (default: 2)
until it gives up.

Unfortunately, the retry implementations in Apache Http Client via `HttpRequestRetryHandler`
couldn't be used because they don't allow changing the request (or at least the request URI)
between retries which is necessary to use all configured servers in the server pool.

Fixes #3993
joschi added a commit that referenced this issue Jul 17, 2017
Jest now retries failed Elasticsearch requests a configurable number of times (default: 2)
until it gives up.

Unfortunately, the retry implementations in Apache Http Client via `HttpRequestRetryHandler`
couldn't be used because they don't allow changing the request (or at least the request URI)
between retries which is necessary to use all configured servers in the server pool.

Fixes #3993

(cherry picked from commit 5ea9428)
bernd pushed a commit that referenced this issue Jul 17, 2017
Jest now retries failed Elasticsearch requests a configurable number of times (default: 2)
until it gives up.

Unfortunately, the retry implementations in Apache Http Client via `HttpRequestRetryHandler`
couldn't be used because they don't allow changing the request (or at least the request URI)
between retries which is necessary to use all configured servers in the server pool.

Fixes #3993

(cherry picked from commit 5ea9428)
mariussturm pushed a commit that referenced this issue Jul 18, 2017
Jest now retries failed Elasticsearch requests a configurable number of times (default: 2)
until it gives up.

Unfortunately, the retry implementations in Apache Http Client via `HttpRequestRetryHandler`
couldn't be used because they don't allow changing the request (or at least the request URI)
between retries which is necessary to use all configured servers in the server pool.

Fixes #3993
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