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https://issues.apache.org/jira/browse/MAPREDUCE-4145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252678#comment-13252678
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Steve Loughran commented on MAPREDUCE-4145:
-------------------------------------------
stack
2012-04-12 18:56:16,187 INFO org.apache.hadoop.mapred.TaskTracker: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting TaskTracker
STARTUP_MSG: host = ranier/192.168.1.92
STARTUP_MSG: args = []
STARTUP_MSG: version = 1.0.1
STARTUP_MSG: build = -r ; compiled by 'jenkins' on Tue Mar 20 16:09:05 UTC
2012
************************************************************/
2012-04-12 18:56:16,453 INFO org.apache.hadoop.metrics2.impl.MetricsConfig:
loaded properties from hadoop-metrics2.properties
2012-04-12 18:56:16,531 INFO
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source
MetricsSystem,sub=Stats registered.
2012-04-12 18:56:16,532 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl:
Scheduled snapshot period at 10 second(s).
2012-04-12 18:56:16,532 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl:
TaskTracker metrics system started
2012-04-12 18:56:16,865 INFO
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi
registered.
2012-04-12 18:56:16,870 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl:
Source name ugi already exists!
2012-04-12 18:56:22,135 INFO org.mortbay.log: Logging to
org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
2012-04-12 18:56:22,215 INFO org.apache.hadoop.http.HttpServer: Added global
filtersafety (class=org.apache.hadoop.http.HttpServer$QuotingInputFilter)
2012-04-12 18:56:22,238 WARN org.apache.hadoop.mapred.TaskTracker: TaskTracker
local dir /var/lib/hadoop/cache/mapred/mapred/local error can not create
directory: /var/lib/hadoop/cache/mapred/mapred/local, removing from local dirs
2012-04-12 18:56:22,239 ERROR org.apache.hadoop.mapred.TaskTracker: Can not
start task tracker because java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819)
at java.util.ArrayList$Itr.next(ArrayList.java:791)
at
org.apache.hadoop.mapred.TaskTracker$LocalStorage.checkDirs(TaskTracker.java:211)
at org.apache.hadoop.mapred.TaskTracker.<init>(TaskTracker.java:1447)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:3716)
> ConcurrentModificationException in TT if any one of the local dirs is invalid
> -----------------------------------------------------------------------------
>
> Key: MAPREDUCE-4145
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4145
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 1.0.1
> Environment: Ubuntu Linux 10.04 w/ Hadoop installed via Bigtop 0.3.0
> Reporter: Steve Loughran
>
> TT won't come up, stack trace instead. Looks like the deletion of invalid
> dirs breaks the iterator going through the list of dirs.
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