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Re: Modifying Hadoop For join Operation - HDFS - [mail # user]
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...Vikas, Check the below paper on the different ways on performing joins in MR http://lintool.github.com/MapReduceAlgorithms/index.html Also, `Hadoop - The Definitive Guide` ...
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Author: Praveen Sripati,
2013-01-24, 16:52
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Re: Newbie question on block size calculation - HDFS - [mail # user]
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...Seek time is ~ 10ms. If seek time has to be 1% of the transfer time then transfer time has to be ~ 1000 ms (1s). In ~ 1000 ms (1s) with a transfer rate of 100 MB/s, a block of 100MB ca...
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Author: Praveen Sripati,
2012-02-22, 14:46
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Re: Rack Awareness behaviour - Loss of rack - HDFS - [mail # user]
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...two Below is from the 'Hadoop : The Definitive Guide'. So, with a replication of 2 or 3, the first and the second blocks should be placed on different racks. Not sure why they are gett...
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Author: Praveen Sripati,
2012-02-11, 03:39
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Re: Setting up Federated HDFS - HDFS - [mail # user]
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...Chandra, In the namenode hdfs*xml, dfs.federation.nameservice.id is set to ns1, but ns1 is not being used in the xml for defining the name node properties.. Here are the instruct...
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Author: Praveen Sripati,
2012-02-09, 14:22
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Re: HDFS Federation Exception - HDFS - [mail # user]
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...Suresh, Here is the JIRA - https://issues.apache.org/jira/browse/HDFS-2778 Regards, Praveen On Wed, Jan 11, 2012 at 9:28 PM, Suresh Srinivas wrote: ...
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Author: Praveen Sripati,
2012-01-11, 16:48
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Re: HDFS Federation Exception - HDFS - [mail # user]
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...Hi, The documentation (1) suggested to set the `dfs.namenode.rpc-address.ns1` property to `hdfs://nn-host1:rpc-port` in the example. Changing the value to `nn-host1:rpc-port` (removing...
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Author: Praveen Sripati,
2012-01-11, 12:24
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Re: HDFS Federation Exception - HDFS - [mail # user]
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...Hi, Got the latest code to see if any bugs were fixed and did try federation with the same configuration, but was getting similar exception. 2012-01-11 15:25:35,321 ERROR namenod...
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Author: Praveen Sripati,
2012-01-11, 10:10
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Fwd: HDFS Federation Exception - HDFS - [mail # user]
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...Hi, I am trying to setup a HDFS federation and getting the below error. Also, pasted the core-site.xml and hdfs-site.xml at the bottom of the mail. Did I miss something in the configur...
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Author: Praveen Sripati,
2012-01-11, 06:54
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HDFS Federation Exception - HDFS - [mail # dev]
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...Hi, I am trying to setup a HDFS federation and getting the below error. Also, pasted the core-site.xml and hdfs-site.xml at the bottom of the mail. Did I miss something in the configur...
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Author: Praveen Sripati,
2012-01-11, 06:53
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Re: NameNode Safe Mode and CheckPointing - HDFS - [mail # user]
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...During the time the NN stops writing to the old edits file and creates a new edit file, will the file modifications work or not? Curious, how this is handled in the code. Praveen ...
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Author: Praveen Sripati,
2012-01-08, 05:27
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