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https://issues.apache.org/jira/browse/SOLR-4661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620174#comment-13620174
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Hoss Man commented on SOLR-4661:
--------------------------------
bq. Assuming i'm correct about their being an optimization to not open a new
searcher if the commits are identical,
I did some more experimenting and confirmed i was wrong about this -- from
Solr's perspective a new searcher is definitely getting opened and warmed.
I'm not sure, but skimming the code I *think* this discrepancy between the
commit point in use and the commit point on disk may just be a result of using
DirectoryReader.openIfChanged in SolrCore.openNewSearcher ... i got lost a bit
in the code, but is it possible the reader DirectoryReader is returning null
because only the generation changed by the comment, but not any of the actual
indexed data?
> Index Version & Gen Number out of sync on Admin UI
> --------------------------------------------------
>
> Key: SOLR-4661
> URL: https://issues.apache.org/jira/browse/SOLR-4661
> Project: Solr
> Issue Type: Bug
> Components: replication (java), web gui
> Affects Versions: 4.2
> Environment: Solr 4.2 on Linux with JBoss 7.1.1, JDK 1.7
> Reporter: Aditya
> Labels: gui, replication, web
> Attachments: hoss_test.zip, IndexVersionSyncIssue.jpg
>
>
> Index and Gen number on Slave is higher than master.
> If you apply commit on master with no pending docs then the commit time stamp
> and gen is incremented. When Slaves polls master for replication it see the
> index version difference and starts replicating but all files are skipped.
> On Admin UI (on Slaves) the version number displayed for master is old where
> as for slave is the latest which is higher than master.
> Below is the response from master (/replication?command=details) where i see
> two different Version an Gen numbers. This creates confusion of having
> version out of sync, though its not.
> <response>
> <lst name="responseHeader">
> <int name="status">0</int>
> <int name="QTime">1</int>
> </lst>
> <lst name="details">
> <str name="indexSize">1.52 GB</str>
> <str name="indexPath">/storage/solrdata/index/</str>
> <arr name="commits">
> <lst>
> <long name="indexVersion">{color:red}1364835609803{color}</long>
> <long name="generation">{color:red}34{color}</long>
> <arr name="filelist">...</arr>
> </lst>
> </arr>
> <str name="isMaster">true</str>
> <str name="isSlave">false</str>
> <long name="indexVersion">{color:red}1364778010902{color}</long>
> <long name="generation">{color:red}31{color}</long>
> <lst name="master">
> <str name="confFiles">schema.xml</str>
> <arr name="replicateAfter">
> <str>commit</str>
> <str>startup</str>
> </arr>
> <str name="replicationEnabled">true</str>
> <long name="replicatableGeneration">34</long>
> </lst>
> </lst>
> <str name="WARNING">
> This response format is experimental. It is likely to change in the future.
> </str>
> </response>
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