lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hoss Man (JIRA)" <>
Subject [jira] [Updated] (SOLR-3587) Reloading a core is no longer updates analysis process
Date Mon, 02 Jul 2012 17:14:22 GMT


Hoss Man updated SOLR-3587:

         Priority: Blocker  (was: Major)
    Fix Version/s: 4.0
> Reloading a core is no longer updates analysis process
> ------------------------------------------------------
>                 Key: SOLR-3587
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Alexey Serba
>            Priority: Blocker
>             Fix For: 4.0
>         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 <>
> 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
>       configured.
>      SolrCores now properly share IndexWriters across SolrCore reloads.
>     git-svn-id: 13f79535-47bb-0310-9956-ffa450edef68
> {quote}
> It looks like sharing IndexWriters across SolrCore reloads could be the root cause, right?

This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:!default.jspa
For more information on JIRA, see:


To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message