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https://issues.apache.org/jira/browse/SOLR-4380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566270#comment-13566270
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Andrzej Bialecki commented on SOLR-4380:
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I confirm this is an issue in my environment too, where we use a custom
deletion policy to replicate additional side-load index data.
If reopening a writer was too heavy-weight for NRT (was that the motivation for
this change) then perhaps the replication code should use a different mechanism
to obtain the list of IndexCommit-s if there is no writer?
> ReplicationHandler replicateAfter startup not showing commits after SOLR-3911
> -----------------------------------------------------------------------------
>
> Key: SOLR-4380
> URL: https://issues.apache.org/jira/browse/SOLR-4380
> Project: Solr
> Issue Type: Bug
> Components: replication (java)
> Affects Versions: 4.0, 4.1
> Reporter: Gregg Donovan
>
> In the process of upgrading to 4.1 from 3.6, I've noticed that our master
> servers do not show any commit points -- e.g. via
> http://127.0.0.1:8983/solr/collection1/replication?command=commits --
> available until after a new commit happens. So, for static indexes,
> replication doesn't happen and for dynamic indexes, we have to wait until an
> incremental update of master for slaves to see any commits.
> Tracing through the code, it looks like the change that may have effected us
> was part of [SOLR-3911|https://issues.apache.org/jira/browse/SOLR-3911],
> specifically commenting out the initialization of the newIndexWriter in the
> replicateAfterStartup block [1]:
> {code:java}
> // TODO: perhaps this is no longer necessary then?
> // core.getUpdateHandler().newIndexWriter(true);
> {code}
> I'm guessing this is commented out because it is assumed that
> indexCommitPoint was going to be set by that block, but when a slave requests
> commits, that goes back to core.getDeletionPolicy().getCommits() to fetch the
> list of commits. If no indexWriter has been initialized, then, as far as I
> can tell, IndexDeletionPolicyWrapper#onInit will not have been called and
> there will be no commits available.
> By uncommenting this line, I was able to see commits on startup and slaves
> began to replicate successfully.
> [1]
> http://svn.apache.org/viewvc/lucene/dev/branches/branch_4x/solr/core/src/java/org/apache/solr/handler/ReplicationHandler.java?annotate=1420992&diff_format=h&pathrev=1420992#l880
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