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From Li Li <fancye...@gmail.com>
Subject why copy from localhost.localdomain failed and throw UnknownHostException
Date Wed, 02 Apr 2014 06:15:57 GMT
the reducer hangs and the log is:

2014-04-02 14:03:57,235 WARN org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0 copy failed:
attempt_201402271518_0260_m_000001_1 from localhost.localdomain
2014-04-02 14:03:57,235 WARN org.apache.hadoop.mapred.ReduceTask:
java.net.UnknownHostException: localhost.localdomain
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
at java.net.Socket.connect(Socket.java:579)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:483)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:213)
at sun.net.www.http.HttpClient.New(HttpClient.java:300)
at sun.net.www.http.HttpClient.New(HttpClient.java:316)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:992)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:928)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:846)
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getInputStream(ReduceTask.java:1636)
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.setupSecureConnection(ReduceTask.java:1593)
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getMapOutput(ReduceTask.java:1493)
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:1401)
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:1333)

2014-04-02 14:03:57,236 INFO org.apache.hadoop.mapred.ReduceTask: Task
attempt_201402271518_0260_r_000000_0: Failed fetch #16 from
attempt_201402271518_0260_m_000001_1
2014-04-02 14:03:57,236 WARN org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0 adding host localhost.localdomain
to penalty box, next contact in 665 seconds
2014-04-02 14:03:57,236 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0: Got 1 map-outputs from previous
failures
2014-04-02 14:04:17,244 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0 Need another 1 map output(s)
where 0 is already in progress
2014-04-02 14:04:17,244 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0 Scheduled 0 outputs (1 slow hosts
and0 dup hosts)
2014-04-02 14:04:17,244 INFO org.apache.hadoop.mapred.ReduceTask:
Penalized(slow) Hosts:
2014-04-02 14:04:17,244 INFO org.apache.hadoop.mapred.ReduceTask:
localhost.localdomain Will be considered after: 645 seconds.
2014-04-02 14:05:17,269 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0 Need another 1 map output(s)
where 0 is already in progress
2014-04-02 14:05:17,269 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0 Scheduled 0 outputs (1 slow hosts
and0 dup hosts)
2014-04-02 14:05:17,269 INFO org.apache.hadoop.mapred.ReduceTask:
Penalized(slow) Hosts:
2014-04-02 14:05:17,269 INFO org.apache.hadoop.mapred.ReduceTask:
localhost.localdomain Will be considered after: 585 seconds.
2014-04-02 14:06:17,294 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0 Need another 1 map output(s)
where 0 is already in progress
2014-04-02 14:06:17,295 INFO org.apache.hadoop.mapred.ReduceTask:
attempt_201402271518_0260_r_000000_0 Scheduled 0 outputs (1 slow hosts
and0 dup hosts)
2014-04-02 14:06:17,295 INFO org.apache.hadoop.mapred.ReduceTask:
Penalized(slow) Hosts:

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