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Posted to dev@lucene.apache.org by "Shalin Shekhar Mangar (JIRA)" <ji...@apache.org> on 2014/10/22 19:15:35 UTC
[jira] [Assigned] (SOLR-6524) Collections left in recovery state
after node restart because recovery sleep time increases exponentially
between retries
[ https://issues.apache.org/jira/browse/SOLR-6524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shalin Shekhar Mangar reassigned SOLR-6524:
-------------------------------------------
Assignee: Shalin Shekhar Mangar
> Collections left in recovery state after node restart because recovery sleep time increases exponentially between retries
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-6524
> URL: https://issues.apache.org/jira/browse/SOLR-6524
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Assignee: Shalin Shekhar Mangar
> Labels: difficulty-medium, impact-medium, workaround-exists
> Fix For: 5.0
>
> Attachments: SOLR-6524.patch
>
>
> The RecoveryStrategy has a retry wait which is exponential in nature. The first time it waits for 1 second before retrying recovery, then 2 seconds, then 4 seconds and so on.
> This causes problems when running a large number of collections in SolrCloud. We saw a case where there were 500 collections on 3 nodes (1 shard, 3 replicas) and after a node is restarted, many collections can't come back up from recovery because:
> # The overseer is slow to process events (I'll create another issue for it)
> # Because the overseer is slow, cluster state updates are delayed and therefore recovery cannot succeed (WaitForState hangs while waiting to see recovery state on replicas)
> # Because recovery can't succeed immediately, the recovery thread sleeps for larger and larger amounts of time
> # Even after the whole overseer queue is cleared up, many recovery threads have such a long sleep that they won't even attempt to recover for many minutes (upto 10 minutes).
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