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:
