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[MAPREDUCE-4202] TestYarnClientProtocolProvider is broken - MapReduce - [issue]
...The test fails because a cluster is unexpectedly created with an empty conf....
http://issues.apache.org/jira/browse/MAPREDUCE-4202    Author: Daryn Sharp, 2014-09-04, 02:05
[MAPREDUCE-4921] JobClient should acquire HS token with RM principal - MapReduce - [issue]
...The job client may acquire a history server token during job submission.  The renewer is specified in a config value that the user must supply (for new api, a bit different for old api)...
http://issues.apache.org/jira/browse/MAPREDUCE-4921    Author: Daryn Sharp, 2014-09-04, 00:25
[MAPREDUCE-4877] AM doesn't properly support multiple NNs - MapReduce - [issue]
...Yarn/MR clusters assume there's a 1-to-1 correspondence between itself and a NN.  Certain internal paths like the staging dir, job history, intermediate/intermediate-done dirs are resol...
http://issues.apache.org/jira/browse/MAPREDUCE-4877    Author: Daryn Sharp, 2014-07-03, 06:33
[MAPREDUCE-3825] MR should not be getting duplicate tokens for a MR Job. - MapReduce - [issue]
...This is the counterpart to HADOOP-7967.  MR gets tokens for all input, output and the default filesystem when a MR job is submitted. The APIs in FileSystem make it challenging to avoid ...
http://issues.apache.org/jira/browse/MAPREDUCE-3825    Author: Daryn Sharp, 2014-04-16, 23:04
[MAPREDUCE-3704] Yarn client goes into tight loop upon connection failure - MapReduce - [issue]
...If the client fails to connect to the AM or HS, it will go into a tight loop retrying the connection.  The log rapidly grows with multiple log lines per attempt.  Based one of the ...
http://issues.apache.org/jira/browse/MAPREDUCE-3704    Author: Daryn Sharp, 2014-04-16, 22:22
Re: Name node and data node replacement - MapReduce - [mail # user]
...To recover a NN, you probably want to use the HA feature.  If not, try writing your edits to a nfs volume in additional to the local fs.  There is no need to recover a DN.  Th...
   Author: Daryn Sharp, 2013-12-09, 14:48
Re: Client mapred tries to renew a token with renewer specified as nobody - MapReduce - [mail # user]
...We encountered the same issue in yarn's RM so I made the RM recognize it's own tokens and renew them regardless of the renewer.  In part because older versions of oozie hardcode the ren...
   Author: Daryn Sharp, 2013-12-09, 14:39
Re: Problem with RPC encryption over wire - MapReduce - [mail # user]
..."No common protection layer between server and client " likely means the host for job submission does not have hadoop.rpc.protection=privacy.  In order for QOP to work, all client hosts...
   Author: Daryn Sharp, 2013-11-13, 14:40
Re: hdfs -copyToLocal file permission - MapReduce - [mail # user]
...No, permissions are not preserved.  FsShell copy commands match *nix's cp behavior by using the current umask (the conf setting you cited) for the permissions of new file.  Perhaps...
   Author: Daryn Sharp, 2013-06-10, 14:11
Re: ALL HDFS Blocks on the Same Machine if Replication factor = 1 - MapReduce - [mail # user]
...It's normal.  The default placement strategy stores the first block on the same node for performance, then choses a second random node on another rack, then a third node on the same rac...
   Author: Daryn Sharp, 2013-06-10, 13:53
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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