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From hadoop hive <hadooph...@gmail.com>
Subject Problem in reduce phase
Date Fri, 03 Feb 2012 11:26:11 GMT
hey folks,

i m getting this error while running mapreduce and these comes up in reduce
phase..


2012-02-03 16:41:19,780 WARN org.apache.hadoop.mapred.ReduceTask:
attempt_201201271626_5282_r_000000_0 copy failed:
attempt_201201271626_5282_m_000007_2 from hadoopdata3
2012-02-03 16:41:19,954 WARN org.apache.hadoop.mapred.ReduceTask:
java.net.ConnectException: Connection refused
	at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
	at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1345)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1339)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:993)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getInputStream(ReduceTask.java:1447)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getMapOutput(ReduceTask.java:1349)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:1261)
	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:1195)
Caused by: java.net.ConnectException: Connection refused
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
	at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
	at java.net.Socket.connect(Socket.java:519)
	at sun.net.NetworkClient.doConnect(NetworkClient.java:158)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
	at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
	at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
	at sun.net.www.http.HttpClient.New(HttpClient.java:306)
	at sun.net.www.http.HttpClient.New(HttpClient.java:323)
	at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:837)
	at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:778)
	at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:703)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1026)
	... 4 more

2012-02-03 16:41:19,995 INFO org.apache.hadoop.mapred.ReduceTask: Task
attempt_201201271626_5282_r_000000_0: Failed fetch #4 from
attempt_201201271626_5282_m_000007_2
2012-02-03 16:41:19,995 INFO org.apache.hadoop.mapred.ReduceTask:
Failed to fetch map-output from attempt_201201271626_5282_m_000007_2
even after MAX_FETCH_RETRIES_PER_MAP retries...  reporting to the
JobTracker
2012-02-03 16:41:19,995 WARN org.apache.hadoop.mapred.ReduceTask:
attempt_201201271626_5282_r_000000_0 adding host hadoopdata3 to
penalty box, next contact in 150 seconds
2012-02-03 16:41:19,995 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201201271626_5282_r_000000_0: Got 1 map-outputs from previous
failures
2012-02-03 16:42:10,015 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201201271626_5282_r_000000_0 Need another 1 map output(s)
where 0 is already in progress
2012-02-03 16:42:10,015 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201201271626_5282_r_000000_0 Scheduled 0 outputs (1 slow hosts
and0 dup hosts)
2012-02-03 16:42:10,015 INFO org.apache.hadoop.mapred.ReduceTask:
Penalized(slow) Hosts:
2012-02-03 16:42:10,015 INFO org.apache.hadoop.mapred.ReduceTask:
hadoopdata3 Will be considered after: 99 seconds.
2012-02-03 16:43:10,050 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201201271626_5282_r_000000_0 Need another 1 map output(s)
where 0 is already in progress
2012-02-03 16:43:10,050 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201201271626_5282_r_000000_0 Scheduled 0 outputs (1 slow hosts
and0 dup hosts)
2012-02-03 16:43:10,050 INFO org.apache.hadoop.mapred.ReduceTask:
Penalized(slow) Hosts:
2012-02-03 16:43:10,050 INFO org.apache.hadoop.mapred.ReduceTask:
hadoopdata3 Will be considered after: 39 seconds.

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