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https://issues.apache.org/jira/browse/SOLR-17656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17927300#comment-17927300
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ASF subversion and git services commented on SOLR-17656:
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Commit 9b3baab5b460c9a14270642998a610c3bec286c2 in solr's branch
refs/heads/branch_9x from Chris M. Hostetter
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=9b3baab5b46 ]
SOLR-17656: New 'skipLeaderRecovery' replica property allows PULL replicas with
existing indexes to immediately become ACTIVE
(cherry picked from commit e775fd26dbf0d5967c06f226d650bd8a6b896c4e)
> Add expert level option to allowe PULL replicas to go ACTIVE w/o RECOVERING
> ---------------------------------------------------------------------------
>
> Key: SOLR-17656
> URL: https://issues.apache.org/jira/browse/SOLR-17656
> Project: Solr
> Issue Type: New Feature
> Reporter: Chris M. Hostetter
> Assignee: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-17656-1.patch, SOLR-17656.patch
>
>
> In situations where a Solr cluster undergoes a rolling restart (or some other
> "catastrophic" failure situations requiring/causing solr node restarts) there
> can be a snowball effect of poor performance (or even solr node crashing) due
> to fewer then normal replicas serving query requests while replicas on
> restarting nodes are DOWN or RECOVERING – especially if shard leaders are
> also affected, and (restarting) replicas first must wait for a leader
> election before they can recover (or wait to finish recovery from an
> over-worked leader).
> For NRT type usecases, RECOVERING is really a necessary evil to ensure every
> replicas is up to date before handling NRT requests – but in the case of PULL
> replicas, which are expected to routinely "lag" behind their leader, I've
> talked to a lot of Solr users w/usecases where they would be happy to have
> PULL replicas back online serving "stale" data ASAP, and let normal
> IndexFetching "catchup" with the leader later.
> I propose we support a new "advanced" replica property that can be set on
> PULL replicas by expert level users, to indicate: on (re)init, these replicas
> may skip RECOVERING and go directly to ACTIVE.
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