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RE: Large amount of corruption after balancer - Hadoop - [mail # user]
...Uhm...  I see that you're still running CDH2. You may want to go to CDH3b3.  We tended to see corruption too, albeit in our HBase files.  What happens if you bounce your cloud...
   Author: Michael Segel, 2010-10-27, 14:17
RE: CDH3 beta 3 - Hadoop - [mail # user]
...Even still...  What did you see in your log files?  That's probably the best way to find your permission issues.    irst time      ...
   Author: Michael Segel, 2010-10-25, 23:57
RE: Upgrading Hadoop from CDH3b3 to CDH3 - Hadoop - [mail # user]
...CDH3B3 is the latest.  My suggestion is that you get a large bottle of your favorite alcoholic bev erage and enjoy it while you're doing this upgrade.  In B3 you have user hadoop g...
   Author: Michael Segel, 2010-10-20, 16:23
RE: BUG: Anyone use block size more than 2GB before? - Hadoop - [mail # user]
...Ok, I'll bite. Why would you want to use a block size of > 2GB?    rcCode/src%3Chdfs.org.apache.hadoop.hdfs%7BDFSClient.java%E2%98%83DFSClient .apache.hadoop.hdfs%7BDFSClient.ja...
   Author: Michael Segel, 2010-10-18, 22:07
RE: how to set diffent VM parameters for mappers and reducers? - Hadoop - [mail # user]
...Hi,  You don't say which version of Hadoop you are using.  Going from memory, I believe in the CDH3 release from Cloudera, there a re some specific OPTs you can set in hadoop-env.s...
   Author: Michael Segel, 2010-10-05, 13:02
RE: Xcievers Load - Hadoop - [mail # user]
... 4000 xcievers is a lot.  I'm wondering if there's a correlation between the number of xcievers and u limit -n. Should they be configured on a 1 to 1 ratio?  -Mike   &nbs...
   Author: Michael Segel, 2010-09-23, 14:05
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
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
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