Map Reduce Tasks are continously failing, when one among the several harddisks
available on the TaskTracker fails.
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Key: HADOOP-7130
URL: https://issues.apache.org/jira/browse/HADOOP-7130
Project: Hadoop Common
Issue Type: Bug
Components: fs
Affects Versions: 0.20.2
Reporter: Devaraj K
1. Pull out one hard disk from Task tracker node (out of 10 disks pull one).
Now it is noted that some jobs are failing.
However process is continued.
2. Wait for sometime (15 mins) and pull out one disk from another Task tracker.
3. More number of jobs failed now and it can be seen from UI. Process is
getting paused.
The exception can be seen in the job tracker UI for a failed job.
{code:xml}
Error initializing attempt_201010221528_10174_m_000011_0:
java.io.IOException: Expecting a line not the end of stream
at org.apache.hadoop.fs.DF.parseExecResult(DF.java:110)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:182)
at org.apache.hadoop.util.Shell.run(Shell.java:137)
at org.apache.hadoop.fs.DF.getAvailable(DF.java:74)
at
org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:385)
at
org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:134)
at
org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:113)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:835)
at org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:1790)
at org.apache.hadoop.mapred.TaskTracker.access$1200(TaskTracker.java:104)
at org.apache.hadoop.mapred.TaskTracker$TaskLauncher.run(TaskTracker.java:1753)
Error initializing attempt_201010221528_10174_m_000011_1:
org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find any valid
local directory for taskTracker/jobcache/job_201010221528_10174/work
at
org.apache.hadoop.fs.LocalDirAllocator$AllocatorPerContext.getLocalPathForWrite(LocalDirAllocator.java:454)
at
org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:134)
at
org.apache.hadoop.fs.LocalDirAllocator.getLocalPathForWrite(LocalDirAllocator.java:113)
at org.apache.hadoop.mapred.TaskTracker.localizeJob(TaskTracker.java:835)
at org.apache.hadoop.mapred.TaskTracker.startNewTask(TaskTracker.java:1790)
at org.apache.hadoop.mapred.TaskTracker.access$1200(TaskTracker.java:104)
at org.apache.hadoop.mapred.TaskTracker$TaskLauncher.run(TaskTracker.java:1753)
{code}
Task Tracker log can be seen here :
{code:xml}
2010-10-25 16:36:24,215 ERROR mapred.TaskTracker
(TaskTracker.java:offerService(1211)) - Caught exception: java.io.IOException:
Expecting a line not the end of stream
at org.apache.hadoop.fs.DF.parseExecResult(DF.java:110)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:182)
at org.apache.hadoop.util.Shell.run(Shell.java:137)
at org.apache.hadoop.fs.DF.getAvailable(DF.java:74)
at
org.apache.hadoop.mapred.TaskTracker.getFreeSpace(TaskTracker.java:1586)
at
org.apache.hadoop.mapred.TaskTracker.transmitHeartBeat(TaskTracker.java:1274)
at
org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:1106)
at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1848)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:3022)
2010-10-25 16:36:24,216 INFO mapred.TaskTracker (TaskTracker.java:run(1856)) -
Lost connection to JobTracker [/192.168.97.1:9001]. Retrying...
java.lang.Exception: java.io.IOException: Expecting a line not the end of stream
at
org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:1212)
at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:1848)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:3022)
Caused by: java.io.IOException: Expecting a line not the end of stream
at org.apache.hadoop.fs.DF.parseExecResult(DF.java:110)
at org.apache.hadoop.util.Shell.runCommand(Shell.java:182)
at org.apache.hadoop.util.Shell.run(Shell.java:137)
at org.apache.hadoop.fs.DF.getAvailable(DF.java:74)
at
org.apache.hadoop.mapred.TaskTracker.getFreeSpace(TaskTracker.java:1586)
at
org.apache.hadoop.mapred.TaskTracker.transmitHeartBeat(TaskTracker.java:1274)
at
org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:1106)
... 2 more
2010-10-25 16:36:29,550 INFO mapred.TaskTracker
(TaskTracker.java:transmitHeartBeat(1256)) - Resending 'status' to
'192.168.97.1' with reponseId '18361
2010-10-25 16:36:29,550 WARN mapred.TaskTracker
(TaskTracker.java:checkLocalDirs(2982)) - Task Tracker local can not create
directory: /hdfsdata/0/mapred/local
2010-10-25 16:36:32,656 WARN mapred.TaskTracker
(TaskTracker.java:checkLocalDirs(2982)) - Task Tracker local can not create
directory: /hdfsdata/0/mapred/local
{code}
This seems to be fixed in the trunk.
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