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RE: how to revert from a new version to an older one (CDH3)? - Hadoop - [mail # user]
...Not sure if you got your question answered...   You need to delete the current version (via yum) and then specifically re-i nstall the version you want by specifying the full name inclu...
   Author: Michael Segel, 2010-08-24, 11:21
RE: Control the file splits size - Hadoop - [mail # user]
... Uhm...  There may be more to the initial question.  The OP indicated that this was a 'binary file' and that the records may not  be based on an end-of-line. So he may wa...
   Author: Michael Segel, 2010-08-23, 19:14
RE: what will happen if a backup name node folder becomes unaccessible? - Hadoop - [mail # user]
...Ok...   Now you have me confused. Everything we've seen says that writing to both a local disk and to an NFS  mounted disk would be the best way to prevent a problem.  Now you...
   Author: Michael Segel, 2010-08-23, 19:05
[expand - 1 more] - RE: Best practices - Large Hadoop Cluster - Hadoop - [mail # user]
...Raj...  Ok, one of the things we have at one of my clients is the hadoop user's a ccount is actually a centralized account. (User's accounts are mounted as t hey log in to the machine.)...
   Author: Michael Segel, 2010-08-10, 23:55
[expand - 1 more] - RE: Backing up HDFS - Hadoop - [mail # user]
...    And that would be a waste. (Why build a cloud just to store data and not do  any processing?)  You're not building your cloud in a vacuum. There are going to be SAN(s...
   Author: Michael Segel, 2010-08-03, 15:46
[expand - 1 more] - RE: Fair Scheduler documentation? - Hadoop - [mail # general]
... wer points... the allocations.xml file?  find it. Not sure if its a valid [SNIP]     https://issues.apache.org/jira/browse/MAPREDUCE-698 (Found using Yahoo! as my search...
   Author: Michael Segel, 2010-07-26, 16:13
RE: manipulate counters in new api - Hadoop - [mail # user]
...  ,  add and   This is pretty similar to my post to general-hadoop.  The idea is how to create dynamic counters vs enum counters.  To answer Gang's question ... if y...
   Author: Michael Segel, 2010-07-19, 20:00
Dynamic counters in Hadoop M/R jobs... - Hadoop - [mail # general]
...Hi,  In looking at "The Definitive Guide"  pgs 211-218 looking at the documentat ion for counters have a question about how to use the  dynamic (String, String) methods to cre...
   Author: Michael Segel, 2010-07-19, 18:22
RE: Single Node with multiple mappers? - Hadoop - [mail # user]
... Moritz,  I'm not sure what you're doing, but raising the number of mapers in your  configuration isn't a 'hint'.  The number of mapers that you can run will depend on yo...
   Author: Michael Segel, 2010-07-16, 09:59
RE: Please help! Corrupt fsimage? - Hadoop - [mail # user]
...I know this is a little late in the game...  You could have forced the cluster out of safe mode and then use fsck to cop y the bad blocks out to the file system. (See the help on fsck) ...
   Author: Michael Segel, 2010-07-09, 14:35
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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