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https://issues.apache.org/jira/browse/SOLR-3587?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Miller updated SOLR-3587:
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Fix Version/s: 5.0
> Reloading a core is no longer updates analysis process
> ------------------------------------------------------
>
> Key: SOLR-3587
> URL: https://issues.apache.org/jira/browse/SOLR-3587
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Alexey Serba
> Assignee: Mark Miller
> Priority: Blocker
> Fix For: 4.0, 5.0
>
> Attachments: SOLR-3587.patch
>
>
> It's a usual practice in Solr to overwrite synonyms/stopwords files and issue
> a core reload command to force Solr reload these files. We've noticed that
> this trick is no longer working on trunk.
> I started debugging this problem in Eclipse and I can see that Solr actually
> re-reads updated synonym file on core reload, but indexing process still uses
> old reference to Synonym filter / SynonymMap instance.
> When I start Solr initially I can see that my Solr server has 2 instances of
> SynonymMap (the object that holds actual synonyms data). This is expected as
> I have 2 SynonymFilters defined in my schema (one field with 2 synonym
> filters - index + query time)
> After a core reload I see that Solr has 4 instances of this class. So I
> thought that there could be some leak and issued many (N) core reload
> commands and expected to see 2*N instances. It didn't happen. I can only see
> 20 instances of this class.
> This is pretty interesting number as well because, according to thread
> dump/list, Solr/Jetty has 10 working threads in thread pool (by default for
> example configs). So I suspect that we cache something in thread local
> storage and it hits us.
> I looked into the code and found that Lucene caches token streams in
> ThreadLocal, but I don't know the code enough to state that this is the
> problem.
> So I took a different approach and found the commit that introduced this bug.
> I wrote a simple test (shell script) and used _git bisect_ tool to chase this
> bug.
> {quote}
> ffd9c717448eca895d19be8ee9718bc399ac34a7 is the first bad commit
> commit ffd9c717448eca895d19be8ee9718bc399ac34a7
> Author: Mark Robert Miller <[email protected]>
> Date: Thu Jun 30 13:59:59 2011 +0000
> SOLR-2193, SOLR-2565: The default Solr update handler has been improved
> so
> that it uses fewer locks, keeps the IndexWriter open rather than
> closing it
> on each commit (ie commits no longer wait for background merges to
> complete),
> works with SolrCore to provide faster 'soft' commits, and has an
> improved API
> that requires less instanceof special casing.
>
> You may now specify a 'soft' commit when committing. This will
> use Lucene's NRT feature to avoid guaranteeing documents are on stable
> storage in exchange
> for faster reopen times. There is also a new 'soft' autocommit tracker
> that can be
> configured.
>
> SolrCores now properly share IndexWriters across SolrCore reloads.
>
> git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1141542
> 13f79535-47bb-0310-9956-ffa450edef68
> {quote}
> It looks like sharing IndexWriters across SolrCore reloads could be the root
> cause, right?
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