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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3027) JobTracker shuts down during initialization if the NameNode is down
Date Mon, 17 Mar 2008 04:53:24 GMT
JobTracker shuts down during initialization if the NameNode is down
-------------------------------------------------------------------

                 Key: HADOOP-3027
                 URL: https://issues.apache.org/jira/browse/HADOOP-3027
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
            Reporter: Amareshwari Sriramadasu
            Priority: Blocker
             Fix For: 0.17.0


When the JobTracker is initializing and trying to connect to the NameNode, it shuts itself
down if the NameNode is unreachable for more than one iteration of the connect loop. It can
be easily reproduced if the JobTracker is started before the NameNode is started. The JobTracker
will shut itself down in a few seconds. The problem seems to be with adding a shutdown hook
in the FileSystem in the case where the same hook has been added before.

2008-03-17 09:45:20,979 INFO org.apache.hadoop.mapred.JobTracker: JobTracker up at: 9101
2008-03-17 09:45:20,979 INFO org.apache.hadoop.mapred.JobTracker: JobTracker webserver: 50030
2008-03-17 09:45:21,374 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 1 time(s).
2008-03-17 09:45:22,377 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 2 time(s).
2008-03-17 09:45:23,380 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 3 time(s).
2008-03-17 09:45:24,383 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 4 time(s).
2008-03-17 09:45:25,385 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 5 time(s).
2008-03-17 09:45:26,388 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 6 time(s).
2008-03-17 09:45:27,391 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 7 time(s).
2008-03-17 09:45:28,394 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 8 time(s).
2008-03-17 09:45:29,397 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 9 time(s).
2008-03-17 09:45:30,402 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
Already tried 10 time(s).
2008-03-17 09:45:31,406 INFO org.apache.hadoop.mapred.JobTracker: problem cleaning system
directory: /tmp/hadoop/mapred/system
java.net.ConnectException: Connection refused
	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
	at sun.nio.ch.SocketChannelImpl.finishConnect(Unknown Source)
	at sun.nio.ch.SocketAdaptor.connect(Unknown Source)
	at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:174)
	at org.apache.hadoop.ipc.Client.getConnection(Client.java:623)
	at org.apache.hadoop.ipc.Client.call(Client.java:546)
	at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:211)
	at org.apache.hadoop.dfs.$Proxy4.getProtocolVersion(Unknown Source)
	at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:312)
	at org.apache.hadoop.dfs.DFSClient.createRPCNamenode(DFSClient.java:94)
	at org.apache.hadoop.dfs.DFSClient.<init>(DFSClient.java:158)
	at org.apache.hadoop.dfs.DistributedFileSystem.initialize(DistributedFileSystem.java:69)
	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1255)
	at org.apache.hadoop.fs.FileSystem.access$400(FileSystem.java:53)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1272)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:191)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:96)
	at org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:702)
	at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:135)
	at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:2266)
2008-03-17 09:45:41,410 FATAL org.apache.hadoop.mapred.JobTracker: java.lang.IllegalArgumentException:
Hook previously registered
	at java.lang.ApplicationShutdownHooks.add(Unknown Source)
	at java.lang.Runtime.addShutdownHook(Unknown Source)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1269)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:191)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:96)
	at org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:702)
	at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:135)
	at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:2266)

2008-03-17 09:45:41,412 INFO org.apache.hadoop.mapred.JobTracker: SHUTDOWN_MSG: 

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