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From Gordon Wang <gw...@gopivotal.com>
Subject Re: why copy from localhost.localdomain failed and throw UnknownHostException
Date Wed, 02 Apr 2014 07:55:03 GMT
You may want to check the /etc/hosts. The configuration of localhost may
not right.
Make sure localhost.localdomain can be resolved.


On Wed, Apr 2, 2014 at 2:15 PM, Li Li <fancyerii@gmail.com> wrote:

> 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:
>



-- 
Regards
Gordon Wang

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