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dfs.namenode.edits.dir and dfs.namenode.shared.edits.dir - MapReduce - [mail # user]
...I am running CDH4.2.  I've noticed that my NameNodes are logging edits both locally and to the journalnodes.  I took a look at the code, and this doesn't seem to be required -- and...
   Author: Bryan Beaudreault, 2013-09-16, 21:13
Re: chaining (the output of) jobs/ reducers - MapReduce - [mail # user]
...Hey Adrian,  To clarify, the replication happens on *write*.  So as you write output from the reducer of Job A, you are writing into hdfs.  Part of that write path is replicat...
   Author: Bryan Beaudreault, 2013-09-12, 19:49
Re: In 10-nodes cluster ,how many zookeeper quorum should i need? - MapReduce - [mail # user]
...In what context are you talking?  You'll probably be ok with 3 at that size. — Sent from iPhone  On Sun, Aug 11, 2013 at 9:53 PM, ch huang  wrote:  ...
   Author: Bryan Beaudreault, 2013-08-12, 02:07
Re: Jobtracker page hangs ..again. - MapReduce - [mail # user]
...When I've had problems with a slow jobtracker, i've found the issue to be one of the following two (so far) possibilities:  - long GC pause (I'm guessing this is not it based on your em...
   Author: Bryan Beaudreault, 2013-08-09, 21:09
Re: services requiring topology conf - MapReduce - [mail # user]
...Thanks Adam!   On Fri, Jan 11, 2013 at 12:15 PM, Adam Faris  wrote:  ...
   Author: Bryan Beaudreault, 2013-01-11, 18:08
Re: Misconfiguration of hdfs-site.xml - MapReduce - [mail # user]
...Updating the config and restarting will result in data loss.  You're going to want to migrate the data from your tmp directory to the appropriate place.  The NameNode will use the ...
   Author: Bryan Beaudreault, 2012-12-18, 20:36
Re: Is it necessary to run secondary namenode when starting HDFS? - MapReduce - [mail # user]
...You don't need a secondary name node.  It creates snapshots of the name node metadata periodically, which helps to keep down the size of the edits files.  If you don't run one, ove...
   Author: Bryan Beaudreault, 2012-12-17, 17:12
Status string not displaying in jobtracker - MapReduce - [mail # user]
...Hello,  I am running cdh4.1 (2.0.0-mr1), and my jobs seem to be working fine, except for 2 small problems:  1) Status strings never show up in the jobtracker 2) Built-In counters, ...
   Author: Bryan Beaudreault, 2012-11-09, 05:47
Re: jobtracker page @50030 timeout or take very long time. - MapReduce - [mail # user]
...Does this happen all of the time?  I've seen cases where if I have a job or process that is hosing the CPU of a tasktracker, it can cause the job tracker to pause while trying to contac...
   Author: Bryan Beaudreault, 2012-11-01, 21:26
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