[jira] [Created] (NUTCH-1640) OOM in ParseSegment Phase

["Mitesh Singh Jat (JIRA)" <ji...@apache.org>]

Mitesh Singh Jat created NUTCH-1640:
---------------------------------------

             Summary: OOM in ParseSegment Phase
                 Key: NUTCH-1640
                 URL: https://issues.apache.org/jira/browse/NUTCH-1640
             Project: Nutch
          Issue Type: Bug
    Affects Versions: 1.7
         Environment: RHEL 6.2 x86_64
            Reporter: Mitesh Singh Jat


The nutch ParseSegment phase fails after 2 runs on same TaskTracker, with the following Exception:

{noformat}
Exception in thread "main" org.apache.hadoop.ipc.RemoteException: java.io.IOException: java.lang.OutOfMemoryError: unable to create new native thread
	at java.lang.Thread.start0(Native Method)
	at java.lang.Thread.start(Thread.java:640)
	at org.apache.hadoop.mapred.JvmManager$JvmManagerForType$JvmRunner.kill(JvmManager.java:553)
	at org.apache.hadoop.mapred.JvmManager$JvmManagerForType.killJvmRunner(JvmManager.java:317)
	at org.apache.hadoop.mapred.JvmManager$JvmManagerForType.killJvm(JvmManager.java:297)
	at org.apache.hadoop.mapred.JvmManager$JvmManagerForType.taskKilled(JvmManager.java:289)
	at org.apache.hadoop.mapred.JvmManager.taskKilled(JvmManager.java:158)
	at org.apache.hadoop.mapred.TaskRunner.kill(TaskRunner.java:802)
	at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.kill(TaskTracker.java:3315)
	at org.apache.hadoop.mapred.TaskTracker$TaskInProgress.jobHasFinished(TaskTracker.java:3287)
	at org.apache.hadoop.mapred.TaskTracker.purgeTask(TaskTracker.java:2316)
	at org.apache.hadoop.mapred.TaskTracker.fatalError(TaskTracker.java:3710)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1444)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1440)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:396)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1438)

	at org.apache.hadoop.ipc.Client.call(Client.java:1118)
	at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)
	at $Proxy1.fatalError(Unknown Source)
	at org.apache.hadoop.mapred.Child.main(Child.java:310)

{noformat}


Whereas similar parsing when done in Nutch Fetcher Phase (fetcher.parse=true, fetcher.store.content=false) does not give such issue.

Hence, on analysing the code of Fetcher and ParseSegment, it seems the issue
should be related to creation parseResult foreach url in ParseSegment.java.

{code}
 95     ParseResult parseResult = null;
 96     try {
 97       parseResult = new ParseUtil(getConf()).parse(content); // <*****
 98     } catch (Exception e) {
 99       LOG.warn("Error parsing: " + key + ": " + StringUtils.stringifyException(e));
100       return;
101     }
{code}

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