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Re: Setting thread stack size for child JVM - Hadoop - [mail # user]
...On Fri, May 8, 2009 at 1:11 PM, Ken Krugler wrote:    It doesn't look like Hadoop lets you run an arbitrary ulimit command, but if you take a look at Shell.getUlimitMemoryCommand(c...
   Author: Philip Zeyliger, 2009-05-08, 22:18
Re: Is HDFS protocol written from scratch? - Hadoop - [mail # user]
...On Thu, May 7, 2009 at 1:04 PM, Foss User  wrote:    I believe that the JobClient does write the job's files to HDFS (with mapred.submit.replication replication factor) as par...
   Author: Philip Zeyliger, 2009-05-08, 01:20
Re: cannot open an hdfs file in O_RDWR mode - Hadoop - [mail # user]
... Set dfs.support.append to true in your hadoop-site.xml.  See also https://issues.apache.org/jira/browse/HADOOP-5332 .  ...
   Author: Philip Zeyliger, 2009-05-04, 21:35
Re: No route to host prevents from storing files to HDFS - Hadoop - [mail # user]
...Very naively looking at the code, the exception you see is happening in the write path, on the way to sending a copy of your data to a second data node.  One data node is pipelining the...
   Author: Philip Zeyliger, 2009-04-21, 23:18
a script to re-write JIRA subject lines for easier GMail threading - Hadoop - [mail # user]
...If you subscribe to core-dev and use gmail, you might be interested in a quick script I wrote to log into my e-mail and re-write JIRA subject lines, to fix the threading in gmail.  This...
   Author: Philip Zeyliger, 2009-04-10, 19:27
Re: Does the HDFS client read the data from NameNode, or from DataNode directly? - Hadoop - [mail # user]
... What happens here is that the NameNode redirects you to a "smartly" (a data node that has some of the file's first 5 blocks, I think) chosen DataNode, and that DataNode proxies the fil...
   Author: Philip Zeyliger, 2009-04-10, 19:18
Re: reduce task specific jvm arg - Hadoop - [mail # user]
...There doesn't seem to be.  The command line for the JVM is computed in org.apache.hadoop.mapred.TaskRunner#run().  On Thu, Apr 9, 2009 at 10:30 AM, Jun Rao  wrote:  ...
   Author: Philip Zeyliger, 2009-04-09, 20:55
Re: Web ui - Hadoop - [mail # user]
...On Tue, Apr 7, 2009 at 5:11 AM, Rasit OZDAS  wrote:    https://issues.apache.org/jira/browse/HADOOP-5257 proposes a plugin layer for Hadoop daemons.  Might be useful for ...
   Author: Philip Zeyliger, 2009-04-07, 19:55
Re: connecting two clusters - Hadoop - [mail # user]
...DistCp is the standard way to copy data between clusters.  What it does is run a mapreduce job to copy data between a source cluster and a destination cluster.  See http://hadoop.a...
   Author: Philip Zeyliger, 2009-04-07, 04:54
Re: Hardware - please sanity check? - Hadoop - [mail # user]
...Hadoop data nodes are often configured without RAID (i.e., "JBOD" = Just a Bunch of Disks)--HDFS already provides for the data redundancy.  Also, if you stripe across disks, you're liab...
   Author: Philip Zeyliger, 2009-04-02, 22:48
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