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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3357) delete on dfs hung
Date Wed, 07 May 2008 11:26:55 GMT
delete on dfs hung
------------------

                 Key: HADOOP-3357
                 URL: https://issues.apache.org/jira/browse/HADOOP-3357
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.18.0
            Reporter: Devaraj Das


I had a case where the JobTracker was trying to delete some files, as part of Garbage Collect
for a job, in a dfs directory. The thread hung and this is the trace:

Thread 19 (IPC Server handler 5 on 57344):
  State: WAITING
  Blocked count: 137022
  Waited count: 336004
  Waiting on org.apache.hadoop.ipc.Client$Call@eb6238
  Stack:
    java.lang.Object.wait(Native Method)
    java.lang.Object.wait(Object.java:485)
    org.apache.hadoop.ipc.Client.call(Client.java:683)
    org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:216)
    org.apache.hadoop.dfs.$Proxy4.delete(Unknown Source)
    sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:597)
    org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
    org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
    org.apache.hadoop.dfs.$Proxy4.delete(Unknown Source)
    org.apache.hadoop.dfs.DFSClient.delete(DFSClient.java:515)
    org.apache.hadoop.dfs.DistributedFileSystem.delete(DistributedFileSystem.java:170)
    org.apache.hadoop.fs.FileUtil.fullyDelete(FileUtil.java:118)
    org.apache.hadoop.fs.FileUtil.fullyDelete(FileUtil.java:114)
    org.apache.hadoop.mapred.JobInProgress.garbageCollect(JobInProgress.java:1635)
    org.apache.hadoop.mapred.JobInProgress.isJobComplete(JobInProgress.java:1387)
    org.apache.hadoop.mapred.JobInProgress.completedTask(JobInProgress.java:1348)
    org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:565)
    org.apache.hadoop.mapred.JobTracker.updateTaskStatuses(JobTracker.java:2032)

and it hung for an enormously long amount of time ~1 hour. 

Not sure whether these will help:

I saw this message in the NameNode log around the time the delete was issued by the JobTracker
2008-05-07 09:55:57,375 WARN org.apache.hadoop.dfs.StateChange: DIR* FSDirectory.unprotectedDelete:
failed to remove /mapredsystem/ddas/mapredsystem/10091.gs301249.inktomisearch.com/job_200805070458_0004
because it does not exist

I also checked that the directory in question was actually there (and the job couldn't have
run without this directory being there).

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