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From "Joel Bernstein (JIRA)" <>
Subject [jira] [Commented] (SOLR-4661) Index Version & Gen look out of sync in replication UI when master searcher uses older commit then what is replicatable
Date Wed, 17 Apr 2013 13:59:16 GMT


Joel Bernstein commented on SOLR-4661:

I'm concerned about the empty commits opening a new index searcher on the slave. In my testing
I found that empty commits do not cause a new searcher to open on master, but do open a new
searcher on the slave. This feels like a bug. I'll investigate further. Wondering what peoples
thoughts are on this?
> Index Version & Gen look out of sync in replication UI when master searcher uses
older commit then what is replicatable
> -----------------------------------------------------------------------------------------------------------------------
>                 Key: SOLR-4661
>                 URL:
>             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:, IndexVersionSyncIssue.jpg, SOLR-4661.patch, SOLR-4661.patch,
> the ReplicationHandler (and the replication admin UI screen) report the index version
& gen for the master based on what commit point is currently open for searching -- but
this is not necessarily the most recent commit point available for replication.
> Thus, it can appear that a slave has "gotten ahead" of the master, if there are "empty
commits" (because of reader reopening shotcuts) or commits using openSearcher=false.
> We need to add additional data to help make it clear there is no actual problem in this
> Summary of original bug report..
> {panel}
> 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.

> ...
> {panel}

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