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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1560) TIF (and other clients?) cant seem to find one region (getClosestRowBefore issue?)
Date Mon, 22 Jun 2009 04:08:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722477#action_12722477
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ryan rawson commented on HBASE-1560:
------------------------------------

the mystery deepens, looks like on the server many calls are taking around 60s:

2009-06-21 21:06:32,590 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: Result[]
next time: 60000 (ms)

this causes timeouts, which tickles a bug when a TIF gets an exception on the very first row,
hence the NPEs above.

> TIF (and other clients?) cant seem to find one region (getClosestRowBefore issue?)
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-1560
>                 URL: https://issues.apache.org/jira/browse/HBASE-1560
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>            Reporter: ryan rawson
>            Priority: Blocker
>             Fix For: 0.20.0
>
>
> running a full TIF-mr on a table, it eventually fails, all on 1 of the splits, and all
with the same exception set, which is:
> org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to contact region server
null for region , row '', but failed after 10 attempts.
> Exceptions:
> java.lang.NullPointerException
> java.lang.NullPointerException
> java.lang.NullPointerException
> java.lang.NullPointerException
> java.lang.NullPointerException
> java.lang.NullPointerException
> java.lang.NullPointerException
> java.lang.NullPointerException
> java.lang.NullPointerException
> java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getRegionServerWithRetries(HConnectionManager.java:935)
> 	at org.apache.hadoop.hbase.client.HTable$ClientScanner.nextScanner(HTable.java:1842)
> 	at org.apache.hadoop.hbase.client.HTable$ClientScanner.initialize(HTable.java:1790)
> 	at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:369)
> 	at org.apache.hadoop.hbase.mapred.TableInputFormatBase$TableRecordReader.restart(TableInputFormatBase.java:121)
> 	at org.apache.hadoop.hbase.mapred.TableInputFormatBase$TableRecordReader.next(TableInputFormatBase.java:222)
> 	at org.apache.hadoop.hbase.mapred.TableInputFormatBase$TableRecordReader.next(TableInputFormatBase.java:90)
> 	at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.moveToNext(MapTask.java:191)
> 	at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.next(MapTask.java:175)
> 	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:48)
> 	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:356)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
> 	at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Suspicion: We can't locate the 'root' region with key '' or null.  Probably an issue
with getClosestRowBefore.

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