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https://issues.apache.org/jira/browse/SOLR-1853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851799#action_12851799
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Noble Paul commented on SOLR-1853:
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committed r929454
> ReplicationHandler reports incorrect replication failures
> ---------------------------------------------------------
>
> Key: SOLR-1853
> URL: https://issues.apache.org/jira/browse/SOLR-1853
> Project: Solr
> Issue Type: Bug
> Components: replication (java)
> Affects Versions: 1.4
> Environment: Linux
> Reporter: Shawn Smith
>
> The ReplicationHandler "details" command reports that replication failed when
> it didn't. This occurs after a slave is restarted when it is already in sync
> with the master. This makes it difficult to write production monitors that
> check the health of master-slave replication (no network issues, unexpected
> slowdowns, etc).
> From the code, it looks like "SnapPuller.successfulInstall" starts out false
> on restart. If the slave starts out in sync with the master, then each no-op
> replication poll leaves "successfulInstall" set to false which makes
> SnapPuller.logReplicationTimeAndConfFiles log the poll as a failure.
> SnapPuller.successfulInstall stays false until the first time replication
> actually has to do something, at which point it gets set to true, and then
> everything is OK.
> h4. Steps to reproduce
> # Setup Solr master and slave servers using Solr 1.4 Java replication.
> # Index some content on the master. Wait for it to replicate through to the
> slave so the master and slave are in sync.
> # Stop the slave server.
> # Restart the slave server.
> # Wait for the first slave replication poll.
> # Query the replication status using
> "http://localhost:8983/solr/replication?command=details";
> # Until the master index changes and there's something to replicate, all
> slave replication polls after the restart will be shown as failed in the XML
> response.
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