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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-3878) Hbase client throws NoSuchElementException
Date Thu, 12 May 2011 18:49:47 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack resolved HBASE-3878.
--------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

Committed branch and trunk.  Thanks for the patch Ted.

> Hbase client throws NoSuchElementException
> ------------------------------------------
>
>                 Key: HBASE-3878
>                 URL: https://issues.apache.org/jira/browse/HBASE-3878
>             Project: HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.90.2
>            Reporter: gaojinchao
>            Assignee: Ted Yu
>             Fix For: 0.90.4
>
>         Attachments: 3878.patch
>
>
> Soft reference objects, which are cleared at the discretion of the 
> garbage collector in response to memory demand. 
> I used ycsb to put data and threw exception.
> >>>> 
> >>>>  Hbase Code:
> >>>>     // Cut the cache so that we only get the part that could contain
> >>>>     // regions that match our key
> >>>>     SoftValueSortedMap<byte[], HRegionLocation> matchingRegions
=
> >>>>       tableLocations.headMap(row);
> >>>> 
> >>>>     // if that portion of the map is empty, then we're done. otherwise,
> >>>>     // we need to examine the cached location to verify that it is
> >>>>     // a match by end key as well.
> >>>>     if (!matchingRegions.isEmpty()) {
> >>>>       HRegionLocation possibleRegion =
> >>>>         matchingRegions.get(matchingRegions.lastKey());
> >>>> 
> >>>>   ycsb client log:
> >>>> 
> >>>>   [java] begin StatusThread run
> >>>>    [java] java.util.NoSuchElementException
> >>>>    [java]     at java.util.TreeMap.key(TreeMap.java:1206)
> >>>>    [java]     at
> >> java.util.TreeMap$NavigableSubMap.lastKey(TreeMap.java:1435)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.util.SoftValueSortedMap.lastKey(SoftValueSort
> >> edMap.java:131)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplemen
> >> tation.getCachedLocation(HConnectionManager.java:841)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplemen
> >> tation.locateRegionInMeta(HConnectionManager.java:664)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplemen
> >> tation.locateRegion(HConnectionManager.java:590)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplemen
> >> tation.processBatch(HConnectionManager.java:1114)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplemen
> >> tation.processBatchOfPuts(HConnectionManager.java:1234)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:819)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:675)
> >>>>    [java]     at
> >> org.apache.hadoop.hbase.client.HTable.put(HTable.java:665)
> >>>>    [java]     at com.yahoo.ycsb.db.HBaseClient.update(Unknown Source)
> >>>>    [java]     at com.yahoo.ycsb.db.HBaseClient.insert(Unknown Source)
> >>>>    [java]     at com.yahoo.ycsb.DBWrapper.insert(Unknown Source)
> >>>>    [java]     at com.yahoo.ycsb.workloads.MyWorkload.doInsert(Unknown
> >> Source)
> >>>>    [java]     at com.yahoo.ycsb.ClientThread.run(Unknown Source)

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