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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6200) KeyComparator.compareWithoutRow can be wrong when families have the same prefix
Date Mon, 25 Jun 2012 13:21:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6200?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-6200:
---------------------------------

    Comment: was deleted

(was: -1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12533286/PerformanceTestCase-6200-94.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/2249//console

This message is automatically generated.)
    
> KeyComparator.compareWithoutRow can be wrong when families have the same prefix
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-6200
>                 URL: https://issues.apache.org/jira/browse/HBASE-6200
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.6, 0.92.1, 0.94.0
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jieshan Bean
>            Priority: Blocker
>             Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1
>
>         Attachments: 6200-trunk-v2.patch, HBASE-6200-90-v2.patch, HBASE-6200-90.patch,
HBASE-6200-92-v2.patch, HBASE-6200-92.patch, HBASE-6200-94-v2.patch, HBASE-6200-94.patch,
HBASE-6200-trunk-v2.patch, HBASE-6200-trunk.patch, PerformanceTestCase-6200-94.patch
>
>
> As reported by Desert Rose on IRC and on the ML, {{Result}} has a weird behavior when
some families share the same prefix. He posted a link to his code to show how it fails, http://pastebin.com/7TBA1XGh
> Basically {{KeyComparator.compareWithoutRow}} doesn't differentiate families and qualifiers
so "f:a" is said to be bigger than "f1:", which is false. Then what happens is that the KVs
are returned in the right order from the RS but then doing {{Result.binarySearch}} it uses
{{KeyComparator.compareWithoutRow}} which has a different sorting so the end result is undetermined.
> I added some debug and I can see that the data is returned in the right order but {{Arrays.binarySearch}}
returned the wrong KV, which is then verified agains the passed family and qualifier which
fails so null is returned.
> I don't know how frequent it is for users to have families with the same prefix, but
those that do have that and that use those families at the same time will have big correctness
issues. This is why I mark this as a blocker.

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