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Posted to dev@lucene.apache.org by "Otis Gospodnetic (JIRA)" <ji...@apache.org> on 2011/04/04 20:37:05 UTC
[jira] [Commented] (SOLR-1853) ReplicationHandler reports incorrect
replication failures
[ https://issues.apache.org/jira/browse/SOLR-1853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13015537#comment-13015537 ]
Otis Gospodnetic commented on SOLR-1853:
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This issue is still open, but it looks like Paul fixed it 1 year ago?
Shawn, is this still a problem for you?
> 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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