Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
HBase, mail # user - The Exceptions When Concurrently Writing and Reading


Copy link to this message
-
Re: The Exceptions When Concurrently Writing and Reading
Ted Yu 2013-02-05, 18:49
There're several 0.92 releases, can you be more specific ?

Thanks

On Tue, Feb 5, 2013 at 10:46 AM, Bing Li <[EMAIL PROTECTED]> wrote:

> Dear Ted,
>
> My HBase is 0.92.
>
> Thanks!
> Bing
>
> On Wed, Feb 6, 2013 at 2:45 AM, Ted Yu <[EMAIL PROTECTED]> wrote:
> > To help us more easily correlate line numbers, can you tell us the
> version
> > of HBase you're using ?
> >
> > Thanks
> >
> > On Tue, Feb 5, 2013 at 10:39 AM, Bing Li <[EMAIL PROTECTED]> wrote:
> >
> >> Dear all,
> >>
> >> To raise the performance of writing data into HBase, the
> >> "synchronized" is removed from the writing method.
> >>
> >> But after "synchronized" is removed from the method of writing, I get
> >> the following exceptions when reading. Before the removal, no such
> >> exceptions.
> >>
> >> Could you help me how to solve it?
> >>
> >> Thanks so much!
> >>
> >> Best wishes,
> >> Bing
> >>
> >>       Feb 6, 2013 12:21:31 AM
> >> org.apache.hadoop.hbase.ipc.HBaseClient$Connection run
> >>       WARNING: Unexpected exception receiving call responses
> >> java.lang.NullPointerException
> >>           at
> >>
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:521)
> >>           at
> >>
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readFields(HbaseObjectWritable.java:297)
> >>           at
> >>
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:593)
> >>           at
> >>
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:505)
> >>       Feb 6, 2013 12:21:31 AM
> >> org.apache.hadoop.hbase.client.ScannerCallable close
> >>       WARNING: Ignore, probably already closed
> >>       java.io.IOException: Call to greatfreeweb/127.0.1.1:60020
> >> failed on local exception: java.io.IOException: Unexpected exception
> >> receiving call responses
> >>           at
> >>
> org.apache.hadoop.hbase.ipc.HBaseClient.wrapException(HBaseClient.java:934)
> >>           at
> >> org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:903)
> >>           at
> >>
> org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:150)
> >>           at $Proxy6.close(Unknown Source)
> >>           at
> >>
> org.apache.hadoop.hbase.client.ScannerCallable.close(ScannerCallable.java:112)
> >>           at
> >>
> org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:74)
> >>           at
> >>
> org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:39)
> >>           at
> >>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithRetries(HConnectionManager.java:1325)
> >>           at
> >>
> org.apache.hadoop.hbase.client.HTable$ClientScanner.nextScanner(HTable.java:1167)
> >>           at
> >>
> org.apache.hadoop.hbase.client.HTable$ClientScanner.next(HTable.java:1296)
> >>           at
> >>
> org.apache.hadoop.hbase.client.HTable$ClientScanner$1.hasNext(HTable.java:1356)
> >>           at
> >>
> com.greatfree.hbase.rank.NodeRankRetriever.LoadNodeGroupNodeRankRowKeys(NodeRankRetriever.java:348)
> >>           at
> >>
> com.greatfree.ranking.PersistNodeGroupNodeRanksThread.run(PersistNodeGroupNodeRanksThread.java:29)
> >>           at
> >>
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> >>           at
> >>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> >>           at java.lang.Thread.run(Thread.java:662) Caused by:
> >> java.io.IOException: Unexpected exception receiving call responses
> >>           at
> >>
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:509)
> >>       Caused by: java.lang.NullPointerException
> >>           at
> >>
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readObject(HbaseObjectWritable.java:521)
> >>           at
> >>
> org.apache.hadoop.hbase.io.HbaseObjectWritable.readFields(HbaseObjectWritable.java:297)
> >>           at
> >>
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:593)