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Re: About connection to NameNode in NameNode-HA - MapReduce - [mail # user]
...Hi Yamashita,  Yes, the order in which the nodes are tried is indeed the order in which your nodes are listed in the configuration.  We currently do write StandybException into the...
   Author: Todd Lipcon, 2012-11-01, 16:43
Re: DataNodes fail to send heartbeat to HA-enabled NameNode - MapReduce - [mail # user]
...BTW, I forgot that I did file a ticket a while back on a related issue: https://issues.apache.org/jira/browse/hdfs-2882  My assumption is that, higher up in the logs, you will find an u...
   Author: Todd Lipcon, 2012-10-30, 20:16
Re: HDFS HA IO Fencing - MapReduce - [mail # user]
...NFS Locks typically last forever if you disconnect abruptly. So they are not sufficient -- your standby wouldn't be able to take over without manual intervention to remove the lock.  If...
   Author: Todd Lipcon, 2012-10-26, 14:37
[MAPREDUCE-486] JobTracker web UI counts COMMIT_PENDING tasks as Running - MapReduce - [issue]
...In jobdetails.jsp, tasks in COMMIT_PENDING state are listed as "Running". I propose creating another column in this table for COMMIT_PENDING tasks, since users find it confusing that a given...
http://issues.apache.org/jira/browse/MAPREDUCE-486    Author: Todd Lipcon, 2012-10-17, 23:30
[MAPREDUCE-2376] test-task-controller fails if run as a userid < 1000 - MapReduce - [issue]
...test-task-controller tries to verify that the task-controller won't run on behalf of users with uid < 1000. This makes the test fail when running in some test environments - eg our hudson...
http://issues.apache.org/jira/browse/MAPREDUCE-2376    Author: Todd Lipcon, 2012-10-17, 22:59
[MAPREDUCE-3394] Add log guard for a debug message in ReduceTask - MapReduce - [issue]
...There's a LOG.debug message in ReduceTask that stringifies a task ID and uses a non-negligible amount of CPU in some cases. We should guard it with isDebugEnabled...
http://issues.apache.org/jira/browse/MAPREDUCE-3394    Author: Todd Lipcon, 2012-10-17, 19:27
[MAPREDUCE-2103] task-controller shouldn't require o-r permissions - MapReduce - [issue]
...The task-controller currently checks that "other" users don't have read permissions. This is unnecessary - we just need to make it's not executable. The debian policy manual explains it well...
http://issues.apache.org/jira/browse/MAPREDUCE-2103    Author: Todd Lipcon, 2012-10-17, 19:27
[MAPREDUCE-1740] NPE in getMatchingLevelForNodes when node locations are variable depth - MapReduce - [issue]
...In getMatchingLevelForNodes, we assume that both nodes have the same "depth" (ie number of path components). If the user provides a topology script that assigns one node a path like /foo/bar...
http://issues.apache.org/jira/browse/MAPREDUCE-1740    Author: Todd Lipcon, 2012-10-17, 19:27
[MAPREDUCE-3278] 0.20: avoid a busy-loop in ReduceTask scheduling - MapReduce - [issue]
...Looking at profiling results, it became clear that the ReduceTask has the following busy-loop which was causing it to suck up 100% of CPU in the fetch phase in some configurations: the numbe...
http://issues.apache.org/jira/browse/MAPREDUCE-3278    Author: Todd Lipcon, 2012-10-17, 19:27
[MAPREDUCE-2073] TestTrackerDistributedCacheManager should be up-front about requirements on build environment - MapReduce - [issue]
...TestTrackerDistributedCacheManager will fail on a system where the build directory is in any path where an ancestor doesn't have a+x permissions. On one of our hudson boxes, for example, hud...
http://issues.apache.org/jira/browse/MAPREDUCE-2073    Author: Todd Lipcon, 2012-10-17, 19:27
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