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[HADOOP-11527] Support ServiceLoader mechanism for finding subclasses of AbstractFileSystem. - Hadoop - [issue]
...Currently, Hadoop code can discover custom implementations of FileSystem via either configuration mapping the scheme to the class name or the Java ServiceLoader mechanism.  However, for...
http://issues.apache.org/jira/browse/HADOOP-11527    Author: Chris Nauroth, 2015-01-30, 20:19
[HADOOP-11528] Document precedence rules for generic command line options. - Hadoop - [issue]
...Our documentation does not clearly the state the precedence rules when a command line invocation uses multiple generic command line options....
http://issues.apache.org/jira/browse/HADOOP-11528    Author: Chris Nauroth, 2015-01-30, 18:57
[expand - 1 more] - Re: Time until a datanode is marked as dead - Hadoop - [mail # user]
...I believe all properties related to stale datanode configuration arealready covered in hdfs-default.xml,but dfs.namenode.heartbeat.recheck-interval is definitely missing.Frank, if you file t...
   Author: Chris Nauroth, 2015-01-26, 18:55
[expand - 1 more] - Re: Mapreduce HistoryServer Hangs Processing Large Jobs - Hadoop - [mail # user]
...Yes, if you can attach the history file (or a subset) to MAPREDUCE-6222,then that would help.  Thanks again.Chris NaurothHortonworkshttp://hortonworks.com/On Fri, Jan 23, 2015 at 1:40 P...
   Author: Chris Nauroth, 2015-01-23, 21:52
Re: Edits log apply performance - Hadoop - [mail # user]
...Hi Daniel,Unfortunately, there likely isn't anything you can do to speed this up.The process of applying edits will be bound by the available readthroughput on the edits stream and the CPU n...
   Author: Chris Nauroth, 2015-01-19, 17:49
Re: simple hadoop MR program to be executed using java - Hadoop - [mail # user]
...Hello Rab,There is actually quite a lot of logic in the "hadoop jar" shell scripts toset up the classpath (including Hadoop configuration file locations) andset up extra arguments (like heap...
   Author: Chris Nauroth, 2015-01-16, 19:05
Re: InterfaceStability and InterfaceAudience stability - Hadoop - [mail # dev]
...Would it really be backwards-incompatible if we added new levels later?That seems counter-intuitive and contrary to this piece of documentation:http://docs.oracle.com/javase/specs/jls/se7/ht...
   Author: Chris Nauroth, 2015-01-15, 19:27
Re: Namenode HA and data loss - Hadoop - [mail # user]
...Yes, if this is an HDFS cluster deployed with HA using the Quorum JournalManager, then it is protected against data loss.  This documentation pagedescribes the configuration and how the...
   Author: Chris Nauroth, 2015-01-13, 23:19
Re: additional command at step 4, executing Hadoop - Hadoop - [mail # user]
...Hello Hylson,Thank you for the offer to contribute a documentation improvement.I'd expect this to work without explicitly running mkdir first.  In fact,creating the directory first yiel...
   Author: Chris Nauroth, 2015-01-12, 18:03
[HADOOP-11464] Reinstate support for launching Hadoop processes on Windows using Cygwin. - Hadoop - [issue]
...The Windows compatibility work removed the dependency on Cygwin as a compatibility layer.  However, some users may still wish to run Cygwin on a personal machine for running Hadoop comm...
http://issues.apache.org/jira/browse/HADOOP-11464    Author: Chris Nauroth, 2015-01-10, 15:27
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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