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[MAPREDUCE-3475] JT can't renew its own tokens - MapReduce - [issue]
...When external systems submit jobs whose tasks need to submit additional jobs (such as oozie/pig), they include their own MR token used to submit the job.  The token's renewer may not al...
http://issues.apache.org/jira/browse/MAPREDUCE-3475    Author: Daryn Sharp, 2015-03-10, 02:50
[MAPREDUCE-2764] Fix renewal of dfs delegation tokens - MapReduce - [issue]
...The JT may have issues renewing hftp tokens which disrupt long distcp jobs.  The problem is the JT's delegation token renewal code is built on brittle assumptions.  The token's ser...
http://issues.apache.org/jira/browse/MAPREDUCE-2764    Author: Daryn Sharp, 2015-01-09, 18:12
[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
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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