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Re: DataNode heartbeat average time peaks - MapReduce - [mail # user]
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...Worst case if it puts too much strain: randomly failing clients and missing DN heartbeats leading to unnecessary dead node appearances. Worth using a release with HDFS-1457 in or patching yo...
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Author: Harsh J,
2013-03-25, 16:32
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Re: Rack Awareness - MapReduce - [mail # user]
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...Have you locally tested the script? What do you mean by "not work"? Do you not see it loaded, not see it send back proper values, etc. - what? P.s. What version? P.s. User questi...
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Author: Harsh J,
2013-03-25, 12:00
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Re: shuffling one intermediate pair to more than one reducer - MapReduce - [mail # dev]
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...This one is rather easy. Not sure why you'd open a JIRA for a request. JIRA is to be used for feature requests and bug/improvement requests. Also, wasn't this discussed some time back ...
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Author: Harsh J,
2013-03-25, 05:14
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Re: Child JVM memory allocation / Usage - MapReduce - [mail # user]
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...The MapTask may consume some memory of its own as well. What is your io.sort.mb (MR1) or mapreduce.task.io.sort.mb (MR2) set to? On Sun, Mar 24, 2013 at 3:40 PM, nagarjuna kanamarlapud...
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Author: Harsh J,
2013-03-25, 04:56
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Re: Hadoop-2.x native libraries - MapReduce - [mail # user]
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...If you're using a tarball, you'll need to build a native-added tarball yourself with "mvn package -Pdist,native,docs -DskipTests -Dtar" and then use that. Alternatively, if you're inte...
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Author: Harsh J,
2013-03-25, 04:55
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Re: is it possible to disable security in MapReduce to avoid having PriviledgedActionException? - MapReduce - [mail # user]
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...What is the "exact" error you're getting? Can you please paste with the full stack trace and your version in use? Many times the PriviledgedActionException is just a wrapper around the...
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Author: Harsh J,
2013-03-25, 02:11
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Re: For a new installation: use the BackupNode or the CheckPointNode? - MapReduce - [mail # user]
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...Yep, this is correct - you only need the SecondaryNameNode in 1.x. In 2.x, if you run HA, the standby NameNode role also doubles up automatically as the SNN so you don't need to run an extra...
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Author: Harsh J,
2013-03-24, 04:39
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Re: DistributedCache - why not read directly from HDFS? - MapReduce - [mail # user]
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...A DistributedCache is not used just to distribute simple files but also native libraries and such which cannot be loaded by certain if its on HDFS. Also, keeping it on HDFS could provi...
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Author: Harsh J,
2013-03-23, 15:17
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Re: how to control (or understand) the memory usage in hdfs - MapReduce - [mail # user]
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...I'm guessing your OutOfMemory then is due to "Unable to create native thread" message? Do you mind sharing your error logs with us? Cause if its that, then its a ulimit/system limits issue a...
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Author: Harsh J,
2013-03-23, 10:35
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Re: For a new installation: use the BackupNode or the CheckPointNode? - MapReduce - [mail # user]
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...Neither CheckpointNode nor BackupNode exists in version 1.x. This was a documentation oversight that should be cleared in the docs now (or by next release I think). And on 2.x, neither...
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Author: Harsh J,
2013-03-23, 10:33
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