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From "Mukund Madhugiri (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3504) Reduce task hangs after java.net.SocketTimeoutException
Date Thu, 05 Jun 2008 20:41:45 GMT
Reduce task hangs after java.net.SocketTimeoutException
-------------------------------------------------------

                 Key: HADOOP-3504
                 URL: https://issues.apache.org/jira/browse/HADOOP-3504
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.18.0
         Environment: Linux
            Reporter: Mukund Madhugiri
            Priority: Blocker


When running gridmix, I saw 11 reduce tasks hanging. I manually failed the tasks and they
re-ran and then finished.

Here is the task tracker logs:
syslog logs

al on-disk merge with 14 files
2008-06-05 19:02:49,804 INFO org.apache.hadoop.mapred.Merger: Merging 14 sorted segments
2008-06-05 19:03:03,663 INFO org.apache.hadoop.mapred.Merger: Down to the last merge-pass,
with 14 segments left of total size: 1476315198 bytes
2008-06-05 19:03:03,731 WARN org.apache.hadoop.fs.FileSystem: "hostname:56007" is a deprecated
filesystem name. Use "hdfs://hostname:56007/" instead.
2008-06-05 19:03:27,301 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=1/0/0 in:0=1/2626
[rec/s] out:0=0/2626 [rec/s]
2008-06-05 19:03:27,347 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=10/0/0 in:0=10/2626
[rec/s] out:0=0/2626 [rec/s]
2008-06-05 19:03:27,578 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=100/0/0 in:0=100/2627
[rec/s] out:0=0/2627 [rec/s]
2008-06-05 19:03:28,380 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=226/1
2008-06-05 19:03:35,276 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=1000/842/0 in:0=1000/2634
[rec/s] out:0=842/2634 [rec/s]
2008-06-05 19:03:38,667 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=2434/2274
2008-06-05 19:03:45,301 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=10000/9892/0 in:3=10000/2644
[rec/s] out:3=9892/2644 [rec/s]
2008-06-05 19:03:48,716 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=15057/14957
2008-06-05 19:03:59,056 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=24946/24887
2008-06-05 19:04:11,742 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=34653/34433
2008-06-05 19:04:22,548 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=42930/42803
2008-06-05 19:04:32,635 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=57737/57686
2008-06-05 19:04:42,662 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=76224/76063
2008-06-05 19:04:52,666 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=99423/99307
2008-06-05 19:04:52,802 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=100000/99795/0
in:36=100000/2712 [rec/s] out:36=99795/2712 [rec/s]
2008-06-05 19:05:02,754 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=127265/127145
2008-06-05 19:05:12,758 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=185310/185202
2008-06-05 19:05:15,858 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=200000/199974/0
in:73=200000/2735 [rec/s] out:73=199974/2735 [rec/s]
2008-06-05 19:05:22,772 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=218164/218082
2008-06-05 19:05:55,316 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=242591/242411
2008-06-05 19:06:13,678 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=242591/242412
2008-06-05 19:07:23,173 WARN org.apache.hadoop.dfs.DFSClient: DFSOutputStream ResponseProcessor
exception  for block blk_-3463507617208131068_33273java.net.SocketTimeoutException: 69000
millis timeout while waiting for channel to be ready for read. ch : java.nio.channels.SocketChannel[connected
local=/NNN.NNN.NNN.125:59802 remote=/NNN.NNN.NNN.125:57834]
	at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:162)
	at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:150)
	at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:123)
	at java.io.DataInputStream.readFully(DataInputStream.java:178)
	at java.io.DataInputStream.readLong(DataInputStream.java:399)
	at org.apache.hadoop.dfs.DFSClient$DFSOutputStream$ResponseProcessor.run(DFSClient.java:2045)

2008-06-05 19:11:22,535 INFO org.apache.hadoop.streaming.PipeMapRed: Records R/W=243534/243374
2008-06-05 19:11:22,536 WARN org.apache.hadoop.dfs.DFSClient: Error Recovery for block blk_-3463507617208131068_33273
bad datanode[0] NNN.NNN.NNN.125:57834
2008-06-05 19:11:24,388 WARN org.apache.hadoop.dfs.DFSClient: Error Recovery for block blk_-3463507617208131068_33273
in pipeline NNN.NNN.NNN.125:57834, NNN.NNN.NNN.107:58706, NNN.NNN.NNN.122:52897: bad datanode
NNN.NNN.NNN.125:57834


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