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Re: hadoop clients - HDFS - [mail # user]
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...You are correct about your idea of clients. To talk to HDFS, they need to be allowed to talk to the NN's ports as well as the DN's ports. To talk to YARN/MR, they need access to both RM and ...
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Author: Harsh J,
2013-03-21, 00:59
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Re: Combiner in Secondary Sort - HDFS - [mail # user]
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...You're probably running into https://issues.apache.org/jira/browse/MAPREDUCE-3310. There was also a discussion on this IIRC but I cannot find the archive now. One aside mention on this from ...
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Author: Harsh J,
2013-03-21, 00:50
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Re: where reduce is copying? - HDFS - [mail # user]
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...The speed shown there is to be taken with a grain of salt. It is an average value measured from the initiation of its phase. So if the reduce is waiting for more map outputs to be available,...
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Author: Harsh J,
2013-03-20, 07:43
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Re: fsimage.ckpt are not deleted - Exception in doCheckpoint - HDFS - [mail # user]
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...I don't think there's a data loss here. However, I think you may have been affected by https://issues.apache.org/jira/browse/HDFS-4301 due to a large fsimage size perhaps, which you can work...
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Author: Harsh J,
2013-03-20, 07:41
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Re: disk used percentage is not symmetric on datanodes (balancer) - HDFS - [mail # user]
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...If your balancer does not exit, then it means its heavily working in iterations trying to balance your cluster. The default bandwidth allows only for limited transfer speed (10 Mbps) to not ...
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Author: Harsh J,
2013-03-20, 04:05
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Re: Hadoop Query Result - HDFS - [mail # user]
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...Whatever class QueryResult is, your MR job needs its jar to be able to read the SequenceFile as the classname is embedded in it. Passing along its implementing jar will solve the problem. &n...
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Author: Harsh J,
2013-03-20, 00:09
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Re: 2.0.3-alpha in pseudodristributed mode: How to force examples to run on yarn? - HDFS - [mail # user]
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...Do you have a mapred-site.xml configured with mapreduce.framework.name set to yarn? On Wed, Mar 20, 2013 at 12:28 AM, Jens Scheidtmann wrote: Harsh J...
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Author: Harsh J,
2013-03-20, 00:06
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Re: What happens when you have fewer input files than mapper slots? - HDFS - [mail # user]
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...Correction to my previous post: I completely missed https://issues.apache.org/jira/browse/MAPREDUCE-4520 which covers the MR config ends already in 2.0.3. My bad :) On Wed, Mar 20, 201...
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Author: Harsh J,
2013-03-20, 00:05
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Re: What happens when you have fewer input files than mapper slots? - HDFS - [mail # user]
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...You can leverage YARN's CPU Core scheduling feature for this purpose. It was added to the 2.0.3 release via https://issues.apache.org/jira/browse/YARN-2 and seems to fit your need exactly. H...
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Author: Harsh J,
2013-03-20, 00:04
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[HDFS-2541] For a sufficiently large value of blocks, the DN Scanner may request a random number with a negative seed value. - HDFS - [issue]
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...Running off 0.20-security, I noticed that one could get the following exception when scanners are used:DataXceiver java.lang.IllegalArgumentException: n must be positive at java.util.Random....
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http://issues.apache.org/jira/browse/HDFS-2541
Author: Harsh J,
2013-03-19, 17:59
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