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.
