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Re: secondary sort - number of reducers - MapReduce - [mail # user]
...If you don't specify the number of Reducers, Hadoop will use the default -- which, unless you've changed it, is 1.  Regards  Ian.  On Aug 29, 2013, at 4:23 PM, Adeel Qureshi &...
   Author: Ian Wrigley, 2013-08-29, 23:38
Re: hadoop datanode capacity issue - HDFS - [mail # user]
...You're correct: each directory is assumed to be a different storage device. There's really no reason to specify two directories on the same physical disk in dfs.data.dir -- just use one dire...
   Author: Ian Wrigley, 2013-07-06, 15:38
Re: Two Datanodes - Incompatible Cluster IDs - Hadoop - [mail # user]
...If you just blow away the contents of the dfs.data.dir directories then start the DataNode daemon again you should be fine. (That's where the ClusterID is stored. When they next connect to t...
   Author: Ian Wrigley, 2013-06-11, 15:43
Re: Shuffle phase replication factor - HDFS - [mail # user]
...Intermediate data is written to local disk, not to HDFS.  Ian.  On May 21, 2013, at 1:57 PM, John Lilley  wrote:    Ian Wrigley Sr. Curriculum Manager Cloudera, Inc ...
   Author: Ian Wrigley, 2013-05-21, 18:59
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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