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https://issues.apache.org/jira/browse/SOLR-6524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135403#comment-14135403
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Shalin Shekhar Mangar commented on SOLR-6524:
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I think, at a minimum, we should reduce the max wait time of 600 seconds (10
minutes).
> 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
> Labels: difficulty-medium, impact-medium, workaround-exists
> Fix For: 4.11
>
>
> 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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