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From "Wenca Petr (Updated) (JIRA)" <>
Subject [jira] [Updated] (SOLR-3011) DIH MultiThreaded bug
Date Fri, 02 Mar 2012 09:45:59 GMT


Wenca Petr updated SOLR-3011:

    Attachment: patch-3011-EntityProcessorBase-iterator.patch

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:
if (rowIterator == null) {
    String q = getQuery();
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:
>             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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