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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4661) Index Version & Gen Number out of sync on Admin UI
Date Tue, 02 Apr 2013 19:41:15 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620174#comment-13620174
] 

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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