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Re: How can I limit reducers to one-per-node? - HDFS - [mail # user]
...The suggestion to add a combiner is to help reduce the shuffle load (and perhaps, reduce # of reducers needed?), but it doesn't affect scheduling of a set number of reduce tasks nor does a s...
   Author: Harsh J, 2013-02-11, 05:48
Re: Secondary Sort example error - HDFS - [mail # user]
...The JIRA https://issues.apache.org/jira/browse/MAPREDUCE-2584 should help such cases, if what I speculated above is indeed the case.  On Fri, Feb 8, 2013 at 12:16 AM, Harsh J  wrot...
   Author: Harsh J, 2013-02-07, 18:49
[HDFS-4277] SocketTimeoutExceptions over the DataXciever service of a DN should print the DFSClient ID - HDFS - [issue]
...Currently, when one faces a SocketTimeoutExceptions (or any exception rather, in a DN log, for a client <-> DN interaction), we fail to print the DFSClient ID. This makes it untraceabl...
http://issues.apache.org/jira/browse/HDFS-4277    Author: Harsh J, 2013-02-07, 00:05
Re: Apache Development Snapshot Repository does not work - HDFS - [mail # user]
...Are you trying to build a specific submodule here, i.e, under what checked out directory are you running the "mvn install" under? I'd recommend running it under the root of the checkout (the...
   Author: Harsh J, 2013-02-01, 19:10
Re: How to find Blacklisted Nodes via cli. - HDFS - [mail # user]
...There isn't a concept of 'blacklist' in HDFS, it exists only in MapReduce (MR1) and YARN.  Dead Nodes (and those that have been excluded) are reported via "hdfs dfsadmin -report" as ind...
   Author: Harsh J, 2013-01-31, 14:02
[HDFS-4259] Improve pipeline DN replacement failure message - HDFS - [issue]
...The current message shown is something such as below:Failed to add a datanode. User may turn off this feature by setting X.policy in configuration, where the current policy is Y. (Nodes: cur...
http://issues.apache.org/jira/browse/HDFS-4259    Author: Harsh J, 2013-01-28, 13:21
Re: reg max map task config - HDFS - [mail # user]
...Hi,  As noted on http://hadoop.apache.org/docs/stable/cluster_setup.html#Configuring+the+Hadoop+Daemons, and by its own name, the config 'mapred.tasktracker.map.tasks.maximum' applies t...
   Author: Harsh J, 2013-01-28, 05:20
Re: Executing a Python program inside Map Function - HDFS - [mail # user]
...Java provides the Process class to help you launch and read/write from/to processes: http://docs.oracle.com/javase/6/docs/api/java/lang/Process.html. You can use this to spawn your program f...
   Author: Harsh J, 2013-01-26, 16:00
Re: Difference between HDFS and local filesystem - HDFS - [mail # user]
...The local filesystem has no sense of being 'distributed'. If you run a distributed mode of Hadoop over file:// (Local FS), then unless the file:// points being used itself is distributed (su...
   Author: Harsh J, 2013-01-26, 15:55
[HDFS-3801] Provide a way to disable browsing of files from the web UI - HDFS - [issue]
...A few times we've had requests from users who wish to disable browsing of the filesystem in the web UI completely, while keeping other servlet functionality enabled (such as fsck, etc.). Rig...
http://issues.apache.org/jira/browse/HDFS-3801    Author: Harsh J, 2013-01-25, 09:05
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB