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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3655) datenode recoverRbw could hang sometime
Date Fri, 13 Jul 2012 02:56:34 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3655?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ming Ma updated HDFS-3655:
--------------------------

    Attachment: HDFS-3655-0.22.patch

Here is the initial patch from Xiaobo. New unit tests and patch for hadoop 2.0 will come later.
                
> datenode recoverRbw could hang sometime
> ---------------------------------------
>
>                 Key: HDFS-3655
>                 URL: https://issues.apache.org/jira/browse/HDFS-3655
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>            Reporter: Ming Ma
>             Fix For: 0.22.1
>
>         Attachments: HDFS-3655-0.22.patch
>
>
> This bug seems to apply to 0.22 and hadoop 2.0. I will upload the initial fix done by
my colleague Xiaobo Peng shortly ( there is some logistics issue being worked on so that he
can upload patch himself later ).
> recoverRbw try to kill the old writer thread, but it took the lock (FSDataset monitor
object) which the old writer thread is waiting on ( for example the call to data.getTmpInputStreams
).
> "DataXceiver for client /10.110.3.43:40193 [Receiving block blk_-3037542385914640638_57111747
client=DFSClient_attempt_201206021424_0001_m_000401_0]" daemon prio=10 tid=0x00007facf8111800
nid=0x6b64 in Object.wait() [0x00007facd1ddb000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Thread.join(Thread.java:1186)
> ■locked <0x00000007856c1200> (a org.apache.hadoop.util.Daemon)
> at java.lang.Thread.join(Thread.java:1239)
> at org.apache.hadoop.hdfs.server.datanode.ReplicaInPipeline.stopWriter(ReplicaInPipeline.java:158)
> at org.apache.hadoop.hdfs.server.datanode.FSDataset.recoverRbw(FSDataset.java:1347)
> ■locked <0x00000007838398c0> (a org.apache.hadoop.hdfs.server.datanode.FSDataset)
> at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.<init>(BlockReceiver.java:119)
> at org.apache.hadoop.hdfs.server.datanode.DataXceiver.opWriteBlockInternal(DataXceiver.java:391)
> at org.apache.hadoop.hdfs.server.datanode.DataXceiver.opWriteBlock(DataXceiver.java:327)
> at org.apache.hadoop.hdfs.protocol.DataTransferProtocol$Receiver.opWriteBlock(DataTransferProtocol.java:405)
> at org.apache.hadoop.hdfs.protocol.DataTransferProtocol$Receiver.processOp(DataTransferProtocol.java:344)
> at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:183)
> at java.lang.Thread.run(Thread.java:662)

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