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https://issues.apache.org/jira/browse/SOLR-4471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13584289#comment-13584289
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Mark Miller commented on SOLR-4471:
-----------------------------------
No, the commit was not to single new data - see the comment - it was mainly
about fixing an issue when restarting the writer.
At one point, it may have also been what triggered a new searcher, but we have
done that explicitly instead for a while now.
getIndexDir and getNewIndexDir are kind of complicated. getNewIndexDir should
always be safe to use, but it does this extra step of reading a properties file
sometimes. Technically, it's mainly supposed to be critical to use
getNewIndexDir when making new writers and searchers - i sometimes use it
elsewhere in replication to be sure any kind of race is not an issue.
> slave index version is different form master (full index copy needed)
> ---------------------------------------------------------------------
>
> Key: SOLR-4471
> URL: https://issues.apache.org/jira/browse/SOLR-4471
> Project: Solr
> Issue Type: Bug
> Components: replication (java)
> Affects Versions: 4.1
> Reporter: Andre Charton
> Assignee: Mark Miller
> Labels: master, replication, slave, version
> Fix For: 4.2, 5.0
>
> Attachments: SOLR-4471.patch, SOLR-4471.patch, SOLR-4471.patch,
> SOLR-4471_Tests.patch
>
>
> Scenario: master/slave replication, master delta index runs every 10 minutes,
> slave poll interval is 10 sec.
> There was an issue SOLR-4413 - slave reads index from wrong directory, so
> slave is full copy index from master every time, which is fixed after
> applying this patch from 4413 (see script below).
> Now on replication the slave downloads only updated files, but slave is
> create a new segement file and also a new version of index (generation is
> identical with master). On next polling the slave is download the full index
> again, because the new version slave is force a full copy.
> Problem is the new version of index on the slave after first replication.
> {noformat:apply patch SOLR-4413 script, please copy patch into patches
> directory before useage.}
> mkdir work
> cd work
> svn co http://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_1/
> cd lucene_solr_4_1
> patch -p0 < ../../patches/SOLR-4413.patch
> cd solr
> ant dist
> {noformat}
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