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Re: Hadoop 0.20.2: org.apache.hadoop.util.DiskChecker$DiskErrorException: Could not find taskTracker/jobcache/job_201008131730_0001/attempt_201008131730_0001_m_000000_2/output/file.out.index in any of the configured local directories - Hadoop - [mail # user]
...On Aug 15, 2010, at 8:07 PM, Kevin . wrote: the jobs successfully. Thank you! e path didn't work.   Allen's Hadoop Operations Rule #1:  Nothing works the way you expect it wou ld. ...
   Author: Allen Wittenauer, 2010-08-16, 06:44
Re: distcp questions - Hadoop - [mail # user]
...On Aug 15, 2010, at 10:34 AM, Kris Jirapinyo wrote: ered, it seems to allocate 4 mappers per machine.  Is this normal? The issu e here is that say distcp only needs 8 mappers, I would t...
   Author: Allen Wittenauer, 2010-08-16, 06:43
Re: namenode crash in centos. can anybody recommend jdk ? - Hadoop - [mail # user]
...On Aug 13, 2010, at 11:41 AM, Jinsong Hu wrote:  plicitGC -XX:+HeapDumpOnOutOfMemoryError -XX:+UseCompressedOops -XX:+DoEsca peAnalysis -XX:+AggressiveOpts  -Xmx2G  Only 2g he...
   Author: Allen Wittenauer, 2010-08-13, 21:24
Re: Scheduler recommendation - Hadoop - [mail # user]
...On Aug 11, 2010, at 3:05 PM, Bobby Dennett wrote:  We've been running Capacity for about 8 months now on all of our grids.  In  order to make it usable, we did apply two (all ...
   Author: Allen Wittenauer, 2010-08-11, 22:38
Re: Changing hostnames of tasktracker/datanode nodes - any problems? - Hadoop - [mail # user]
...On Aug 10, 2010, at 10:54 AM, Bill Graham wrote: tor  It should work fine.  But yes, highly inefficient.   If you can keep both grids up at the same time, use distcp to do the...
   Author: Allen Wittenauer, 2010-08-10, 18:01
Re: Best practices - Large Hadoop Cluster - Hadoop - [mail # user]
...On Aug 10, 2010, at 6:46 AM, Raj V wrote:  gest  ing ssh  teer to   For hosts? DNS SSHFP records  For users?  Use Kerberos + SSH with GSSAPI enabled...
   Author: Allen Wittenauer, 2010-08-10, 13:54
Re: Best way to reduce a 8-node cluster in half and get hdfs to come out of safe mode - Hadoop - [mail # user]
...On Aug 6, 2010, at 8:35 AM, He Chen wrote:   No need to refresh nodes.  It only re-reads the dfs.hosts.* files.    Depending upon what the bandwidth param is, this should...
   Author: Allen Wittenauer, 2010-08-06, 15:53
Re: Automatic tool for QA checks - Hadoop - [mail # dev]
...  On Jul 26, 2010, at 5:13 AM, Jorge Rodrigez wrote:  I think hudson is subscribed to the various jira mailing lists.  The mail i s piped via stdin to a script that parses it ...
   Author: Allen Wittenauer, 2010-07-26, 23:03
Re: Is it safe to set default/minimum replication to 2? - Hadoop - [mail # user]
...On Jul 21, 2010, at 6:29 PM, Bobby Dennett wrote:   I'm trying to understand 'potential of reduced write operations'.    Does t his mean you want to reduce the amount of wear ...
   Author: Allen Wittenauer, 2010-07-22, 18:30
Re: How to control the number of map tasks for each nodes? - Hadoop - [mail # user]
...On Jul 22, 2010, at 4:40 AM, Vitaliy Semochkin wrote:  Woops, I misspoke.  I meant process switching (which I guess is a form of c ontext switching).  More on that later. &nbs...
   Author: Allen Wittenauer, 2010-07-22, 17:23
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