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RE: safemode: org.apache.hadoop.security.AccessControlException: Access denied for user root. Superuser privilege is required - Hadoop - [mail # user]
...Try running this as user hadoop or hdfs. (Depending on which version you ar e running.)  You need to do this on the name node.  If you're root ... # sudo -u hdfs /bin/ksh   An...
   Author: Michael Segel, 2010-11-06, 20:42
[expand - 1 more] - RE: namenode and jobtracker remote access problem - Hadoop - [mail # user]
...Well...  0.0.0.0 means that its listening on all networks and in your case... eth0 a nd 127.0.0.1.  I'd try adding your client to the /etc/hosts on the machines.    me r ...
   Author: Michael Segel, 2010-11-05, 12:13
RE: Loading conf file sitting in HDFS - Hadoop - [mail # general]
...Well the reason I kind of felt that it was added as an after thought is tha t you kind of have a chicken/egg situation.  I mean if you want to read a config file from HDFS, your applica...
   Author: Michael Segel, 2010-10-30, 01:39
RE: Running jar files inside map task - Hadoop - [mail # general]
...Uhm... just to take this in a different direction ...  Yes, you can run a jar file within your hadoop m/r job.  You may end up with class loader problems though, depending on what'...
   Author: Michael Segel, 2010-10-27, 14:20
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
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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