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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8388) Use ROW bloom filter for scanning
Date Sun, 21 Apr 2013 18:07:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13637608#comment-13637608
] 

Ted Yu commented on HBASE-8388:
-------------------------------

Looks like patch v1 made certain scenario worse, e.g.:
{code}
      // File 2's top block is also the KV we are
      // interested. So only 1 seek is needed.
{code}
Here was the test failure for above scenario:
{code}
testLazySeekBlocksRead(org.apache.hadoop.hbase.regionserver.TestBlocksRead)  Time elapsed:
0.137 sec  <<< FAILURE!
junit.framework.AssertionFailedError: Blocks Read Check for Bloom: ROW expected:<1>
but was:<2>
  at junit.framework.Assert.fail(Assert.java:57)
  at junit.framework.Assert.failNotEquals(Assert.java:329)
  at junit.framework.Assert.assertEquals(Assert.java:78)
  at junit.framework.Assert.assertEquals(Assert.java:159)
  at junit.framework.TestCase.assertEquals(TestCase.java:316)
  at org.apache.hadoop.hbase.regionserver.TestBlocksRead.getData(TestBlocksRead.java:164)
  at org.apache.hadoop.hbase.regionserver.TestBlocksRead.getData(TestBlocksRead.java:142)
{code}
                
> Use ROW bloom filter for scanning
> ---------------------------------
>
>                 Key: HBASE-8388
>                 URL: https://issues.apache.org/jira/browse/HBASE-8388
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>             Fix For: 0.98.0, 0.94.8, 0.95.1
>
>         Attachments: 8388-0.94-sketch.txt, 8388-trunk-v1.txt
>
>
> Currently only ROWCOL BFs are used during the scanning process. It seems we could make
use of ROW BFs in StoreFileScanner.requestSeek.
> See HBASE-8362 for background.

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