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in MR on YARN, can I change my applicationMaster code? - Hadoop - [mail # user]
...we are hit with this bug https://issues.apache.org/jira/browse/YARN-2175I could either change the NodeManager, or ApplicationMaster, but NM is partof the infrastructure installation and owne...
   Author: Yang, 2014-11-07, 00:10
[expand - 1 more] - Re: run arbitrary job (non-MR) on YARN ? - Hadoop - [mail # user]
...thanks!On Wed, Oct 29, 2014 at 2:38 PM, Kevin  wrote: ...
   Author: Yang, 2014-10-30, 22:07
[expand - 1 more] - Re: why does hadoop creates /tmp/hadoop-user/hadoop-unjar-xxxx/ dir and unjar my fat jar? - Hadoop - [mail # user]
...I thought this might be because that hadoop wants to pack everything(including the -files dfs cache files) into one single jar, so I removedthe -files commands I have.but it still extracts t...
   Author: Yang, 2014-10-25, 09:48
[expand - 1 more] - Re: where do I get the info in the task attempt report page for "Status" ? - Hadoop - [mail # user]
...attached a screen shotOn Wed, Oct 15, 2014 at 11:45 AM, Yang  wrote:  ...
   Author: Yang, 2014-10-15, 19:10
error in escaping "/" and "+" in hadoop s3://key:secret@bucket/ - Hadoop - [mail # user]
...previously this does work, by escaping "/" with "%2F" (not sure about the "+" case)   now hadoop gives me error saying that signature is wrong.  I went back and generated a new key...
   Author: Yang, 2013-01-18, 23:35
out of memory for Reducer possible? - Hadoop - [mail # user]
...if I do a  X = GROUP ALL my_relation;  in pig.  and let's say X is very big, and contains 1billion records, in the reducer,would it be possible for the reducer to get OOM or s...
   Author: Yang, 2012-08-24, 01:43
[expand - 3 more] - Re: can't disable speculative execution? - Hadoop - [mail # user]
...Thanks Harsh  I did set mapred.map.tasks = 1  but still I can consistently see 3 mappers being invoked  and the order is always like this:  ****_00002_0 ***_00000_0 ***_0...
   Author: Yang, 2012-07-12, 06:39
force minimum number of nodes to run a job? - Hadoop - [mail # user]
...let's say my job can run on 4 mapper slots, but if there is only 1 slot available, I don't want them to run one by one, and have to wait till the time that at least 4 slots are available. &n...
   Author: Yang, 2012-07-03, 00:18
bug in streaming? - Hadoop - [mail # user]
...if I set input to a file that contains just 1 line (which does not even contain "\n")  and the mapper is  -mapper " bash -c './a.sh' "  and a.sh is  echo -n "|" cat echo ...
   Author: Yang, 2012-07-02, 21:16
S3-->HDFS -->MR or S3-->MR ? - Hadoop - [mail # user]
...our raw data is in S3, and we need to process them, and dump the output to S3.  so there is no need to store the raw data or output on HDFS.  but since MR works on hdfs,  we n...
   Author: Yang, 2012-06-20, 04:56
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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