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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3987) Fix a NullPointerException on a failure to load Bloom filter data
Date Wed, 15 Jun 2011 01:24:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049561#comment-13049561

Nicolas Spiegelberg commented on HBASE-3987:


@Mikhail: please create a patch file 
git diff > HBASE-3987.patch
and include it as a file attachment instead of putting the patch information in the release
note.  Thanks

> Fix a NullPointerException on a failure to load Bloom filter data
> -----------------------------------------------------------------
>                 Key: HBASE-3987
>                 URL: https://issues.apache.org/jira/browse/HBASE-3987
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.89.20100621, 0.89.20100924, 0.90.0, 0.90.1, 0.90.2, 0.90.3
>            Reporter: Mikhail Bautin
>            Assignee: Mikhail Bautin
>             Fix For: 0.94.0
>   Original Estimate: 24h
>  Remaining Estimate: 24h
> This is a fix for an NullPointerException that happens in passesBloomFilter. The meta
block fails to load, and the IOException catch block sets the Bloom filter to null. Then all
other threads waiting on the Bloom filter to load get a chance to try to load the meta block,
and one of them eventually succeeds and goes on to query the Bloom filter in StoreFile.passesBloomFilter,
but bloomFilter has been already set to null. The fix is to cache the bloomFilter variable
in a local variable in passesBloomFilter so that it cannot be made null while the thread is
waiting for another thread to load Bloom filter bits.

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