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From Michael Stack <st...@duboce.net>
Subject Re: xceiverCount 257 exceeds the limit of concurrent xcievers 256
Date Wed, 12 Nov 2008 21:35:50 GMT
Try upping the limit on your datanodes.  Set dfs.datanode.max.xcievers 
up to 1024 or more.
St.Ack

Dru Jensen wrote:
> hbase-users,
>
> I have been running MR processes for several days against HBase with 
> success until recently the region servers shut themselves down.
> Hadoop 0.18.1
> Hbase 0.18.1
> 3 node cluster
>
> Checking the region server logs, I see the following Exception before 
> shutdown:
>
> 2008-11-11 19:55:52,451 INFO org.apache.hadoop.dfs.DFSClient: 
> Exception in createBlockOutputStream java.io.IOException: Could not 
> read from stream
> 2008-11-11 19:55:52,451 INFO org.apache.hadoop.dfs.DFSClient: 
> Abandoning block blk_-5467014108758633036_595771
> 2008-11-11 19:55:58,455 WARN org.apache.hadoop.dfs.DFSClient: 
> DataStreamer Exception: java.io.IOException: Unable to create new block.
> 2008-11-11 19:55:58,455 WARN org.apache.hadoop.dfs.DFSClient: Error 
> Recovery for block blk_-5467014108758633036_595771 bad datanode[0]
> 2008-11-11 19:55:58,482 FATAL 
> org.apache.hadoop.hbase.regionserver.Flusher: Replay of hlog required. 
> Forcing server shutdown
>
> Hadoop datanode:
>
> ERROR org.apache.hadoop.dfs.DataNode: 
> DatanodeRegistration(10.10.10.53:50010, 
> storageID=DS-1570581820-10.10.10.53-50010-1224117842339, 
> infoPort=50075, ipcPort=50020):DataXceiver: java.io.IOException: 
> xceiverCount 258 exceeds the limit of concurrent xcievers 256
>
> Also, I can't seem to recover from this.
>
> At restart HBase regionserver log:
>
> ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: error 
> opening region table,key,1226427697843
> java.io.IOException: Could not obtain block: 
> blk_-7717647125888341834_589063 
> file=/hbase/table/1691377931/title/mapfiles/7939912624709782499/index
>
> Hadoop datanode:
>
> ERROR org.apache.hadoop.dfs.DataNode: 
> DatanodeRegistration(10.10.10.51:50010, 
> storageID=DS-2079833884-10.10.10.51-50010-1224117832456, 
> infoPort=50075, ipcPort=50020):DataXceiver: java.io.IOException: 
> xceiverCount 257 exceeds the limit of concurrent xcievers 256
>     at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:1030)
>     at java.lang.Thread.run(Thread.java:595)
>
> Any help is appreciated.
>
> Thanks,
> Dru
>


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