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https://issues.apache.org/jira/browse/SOLR-3011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13220805#comment-13220805
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Wenca Petr edited comment on SOLR-3011 at 3/2/12 9:47 AM:
----------------------------------------------------------
Well, I solved it. The problem was in EntityProcessorBase.getNext() method
which set the rowIterator to null when it reached the end of data. Then the
next thread called nextRow() on the SqlEntityProcessor instance where the code
is:
{code}
if (rowIterator == null) {
String q = getQuery();
initQuery(context.replaceTokens(q));
}
{code}
So it reinitialized the query and created new row iterator from the beginning.
I am attaching a simple patch.
was (Author: wenca):
Well, I solved it. The problem was in EntityProcessorBase.getNext() method
which set the rowIterator to null when it reached the end of data. Then the
next thread called nextRow() on the SqlEntityProcessor instance where the code
is:
{code:title=SqlEntityProcessor.nextRow()|borderStyle=solid}
if (rowIterator == null) {
String q = getQuery();
initQuery(context.replaceTokens(q));
}
{/code}
So it reinitialized the query and created new row iterator from the beginning.
I am attaching a simple patch.
> DIH MultiThreaded bug
> ---------------------
>
> Key: SOLR-3011
> URL: https://issues.apache.org/jira/browse/SOLR-3011
> Project: Solr
> Issue Type: Sub-task
> Components: contrib - DataImportHandler
> Affects Versions: 3.5, 4.0
> Reporter: Mikhail Khludnev
> Priority: Minor
> Fix For: 4.0
>
> Attachments: SOLR-3011.patch, SOLR-3011.patch,
> patch-3011-EntityProcessorBase-iterator.patch
>
>
> current DIH design is not thread safe. see last comments at SOLR-2382 and
> SOLR-2947. I'm going to provide the patch makes DIH core threadsafe. Mostly
> it's a SOLR-2947 patch from 28th Dec.
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