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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3793) HBASE-3468 Broke checkAndPut with null value
Date Thu, 04 Oct 2012 00:05:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13469005#comment-13469005
] 

Phabricator commented on HBASE-3793:
------------------------------------

mbautin has closed the revision "[jira] [HBASE-3793] [89-fb] Fix TestHRegion failure with
zero-length expected value in compare-and-put".

CHANGED PRIOR TO COMMIT
  https://reviews.facebook.net/D5835?vs=19239&id=19287#differential-review-toc

REVISION DETAIL
  https://reviews.facebook.net/D5835

COMMIT
  https://reviews.facebook.net/rHBASEEIGHTNINEFBBRANCH1393838

To: Liyin, Kannan, JIRA, mbautin

                
> HBASE-3468 Broke checkAndPut with null value
> --------------------------------------------
>
>                 Key: HBASE-3793
>                 URL: https://issues.apache.org/jira/browse/HBASE-3793
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.92.0
>            Reporter: Lars George
>            Assignee: Ming Ma
>            Priority: Blocker
>             Fix For: 0.92.0
>
>         Attachments: D5835.1.patch, HBASE-3793.patch, HBASE-3793-TRUNK.patch
>
>
> The previous code called Bytes.equal() which does a check for "null" on the left or right
argument. Now the comparator calls Bytes.compareTo() - which has no check for null. But this
is a valid input and checks for existence. I actually noticed this running 
> https://github.com/larsgeorge/hbase-book/blob/master/ch04/src/main/java/client/CheckAndPutExample.java
> This used to work, now it throws an NPE
> {noformat}
> Caused by: java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:854)
> 	at org.apache.hadoop.hbase.filter.WritableByteArrayComparable.compareTo(WritableByteArrayComparable.java:63)
> 	at org.apache.hadoop.hbase.regionserver.HRegion.checkAndMutate(HRegion.java:1681)
> 	at org.apache.hadoop.hbase.regionserver.HRegionServer.checkAndMutate(HRegionServer.java:1693)
> 	... 6 more
> 	at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithRetries(HConnectionManager.java:1026)
> 	at org.apache.hadoop.hbase.client.HTable.checkAndPut(HTable.java:750)
> 	at client.CheckAndPutExample.main(CheckAndPutExample.java:33)
> {noformat}
> Easy fixable, just needs to handle the null value before even calling comparator.compareTo().

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