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From "Per Steffensen (JIRA)" <>
Subject [jira] [Created] (SOLR-3721) Multiple concurrent recoveries of same shard?
Date Wed, 08 Aug 2012 07:47:09 GMT
Per Steffensen created SOLR-3721:

             Summary: Multiple concurrent recoveries of same shard?
                 Key: SOLR-3721
             Project: Solr
          Issue Type: Bug
          Components: multicore, SolrCloud
    Affects Versions: 4.0
         Environment: Using our own Solr release based on Apache revision 1355667. Our changes
to the Solr version is our solutions to TLT-3178 etc., and should have no effect on this issue.
            Reporter: Per Steffensen
             Fix For: 4.0

We run a performance/endurance test on a 7 Solr instance SolrCloud setup and eventually Solrs
lose ZK connections and go into recovery. BTW the recovery often does not ever succeed, but
we are looking into that. While doing that I noticed that, according to logs, multiple recoveries
are in progress at the same time for the same shard. That cannot be intended and I can certainly
imagine that it will cause some problems.
It is just the logs that are wrong, did I make some mistake, or is this a real bug?

See attached grep from log, grepping only on "Finished recovery" and "Starting recovery" logs.
grep -B 1 "Finished recovery\|Starting recovery" solr9.log solr8.log solr7.log solr6.log solr5.log
solr4.log solr3.log solr2.log solr1.log solr0.log > recovery_start_finish.log

It can be hard to get an overview of the log, but I have generated a graph showing (based
alone on "Started recovery" and "Finished recovery" logs) how many recoveries are in progress
at any time for the different shards. See attached recovery_in_progress.png. The graph is
also a little hard to get an overview of (due to the many shards) but it is clear that for
several shards there are multiple recoveries going on at the same time, and that several recoveries
never succeed.

Regards, Per Steffensen

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