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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1394) Uploads sometimes fall to 0 requests/second (Binding up on HLog#append?)
Date Fri, 08 May 2009 17:08:45 GMT
Uploads sometimes fall to 0 requests/second (Binding up on HLog#append?)
------------------------------------------------------------------------

                 Key: HBASE-1394
                 URL: https://issues.apache.org/jira/browse/HBASE-1394
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack


Trying to figure why rate sometimes goes to zero.

Studying the reginoserver, HLog#append looks like a possible culprit.

{code}
"IPC Server handler 7 on 60021" daemon prio=10 tid=0x000000004057dc00 nid=0x1bc4 in Object.wait()
[0x0000000043393000..0x0000000043393b80]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:485)
        at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.writeChunk(DFSClient.java:2964)
        - locked <0x00007f9e3e449ff0> (a java.util.LinkedList)
        - locked <0x00007f9e3e449e18> (a org.apache.hadoop.hdfs.DFSClient$DFSOutputStream)
        at org.apache.hadoop.fs.FSOutputSummer.writeChecksumChunk(FSOutputSummer.java:150)
        at org.apache.hadoop.fs.FSOutputSummer.write1(FSOutputSummer.java:100)
        at org.apache.hadoop.fs.FSOutputSummer.write(FSOutputSummer.java:86)
        - locked <0x00007f9e3e449e18> (a org.apache.hadoop.hdfs.DFSClient$DFSOutputStream)
        at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.write(FSDataOutputStream.java:49)
        at java.io.DataOutputStream.write(DataOutputStream.java:90)
        - locked <0x00007f9e434e5588> (a org.apache.hadoop.fs.FSDataOutputStream)
        at org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:1020)
        - locked <0x00007f9e434e55c0> (a org.apache.hadoop.io.SequenceFile$Writer)
        at org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:984)
        - locked <0x00007f9e434e55c0> (a org.apache.hadoop.io.SequenceFile$Writer)
        at org.apache.hadoop.hbase.regionserver.HLog.doWrite(HLog.java:565)
        at org.apache.hadoop.hbase.regionserver.HLog.append(HLog.java:521)
        - locked <0x00007f9dfa376f70> (a java.lang.Object)
        at org.apache.hadoop.hbase.regionserver.HRegion.update(HRegion.java:1777)
        at org.apache.hadoop.hbase.regionserver.HRegion.batchUpdate(HRegion.java:1348)
        at org.apache.hadoop.hbase.regionserver.HRegion.batchUpdate(HRegion.java:1289)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.batchUpdates(HRegionServer.java:1727)
        at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:642)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:911)
{code}

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