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[MAPREDUCE-4469] Resource calculation in child tasks is CPU-heavy - MapReduce - [issue]
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...In doing some benchmarking on a hadoop-1 derived codebase, I noticed that each of the child tasks was doing a ton of syscalls. Upon stracing, I noticed that it's spending a lot of time loopi...
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http://issues.apache.org/jira/browse/MAPREDUCE-4469
Author: Todd Lipcon,
2013-01-22, 06:52
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Re: Hadoop 1.0.4 Performance Problem - MapReduce - [mail # user]
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...Hi Jon, FYI, this issue in the fair scheduler was fixed by https://issues.apache.org/jira/browse/MAPREDUCE-2905 for 1.1.0. Though it is present again in MR2: https://issues.apache.org/...
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Author: Todd Lipcon,
2012-12-21, 01:06
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[MAPREDUCE-4221] Remove jquery theming support - MapReduce - [issue]
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...As of today we have 9.4MB of JQuery themes in our code tree. In addition to being a waste of space, it's a highly questionable feature. I've never heard anyone complain that the Hadoop inter...
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http://issues.apache.org/jira/browse/MAPREDUCE-4221
Author: Todd Lipcon,
2012-11-13, 20:44
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[MAPREDUCE-3235] Improve CPU cache behavior in map side sort - MapReduce - [issue]
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...When running oprofile on a terasort workload, I noticed that a large amount of CPU usage was going to MapTask$MapOutputBuffer.compare. Upon disassembling this and looking at cycle counters, ...
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http://issues.apache.org/jira/browse/MAPREDUCE-3235
Author: Todd Lipcon,
2012-11-08, 13:26
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Re: About connection to NameNode in NameNode-HA - MapReduce - [mail # user]
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...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...
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Author: Todd Lipcon,
2012-11-01, 16:43
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Re: DataNodes fail to send heartbeat to HA-enabled NameNode - MapReduce - [mail # user]
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...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...
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Author: Todd Lipcon,
2012-10-30, 20:16
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Re: DataNodes fail to send heartbeat to HA-enabled NameNode - MapReduce - [mail # user]
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...Hi Takahiko, Can you please provide the full datanode log up to the point where you first see an NPE? FWIW, this error has nothing to do with the new QuorumJournalManager feature...
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Author: Todd Lipcon,
2012-10-30, 18:23
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Re: HDFS HA IO Fencing - MapReduce - [mail # user]
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...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...
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Author: Todd Lipcon,
2012-10-26, 14:37
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Re: HDFS HA IO Fencing - MapReduce - [mail # user]
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...Hi Liu, Locks are not sufficient, because there is no way to enforce a lock in a distributed system without unbounded blocking. What you might be referring to is a lease, but leases ar...
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Author: Todd Lipcon,
2012-10-25, 13:08
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[MAPREDUCE-486] JobTracker web UI counts COMMIT_PENDING tasks as Running - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-486
Author: Todd Lipcon,
2012-10-17, 23:30
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