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[HDFS-7501] TransactionsSinceLastCheckpoint can be negative on SBNs - HDFS - [issue]
...The metric TransactionsSinceLastCheckpoint is derived as FSEditLog.txid minus NNStorage.mostRecentCheckpointTxId.In Standby mode, the former does not increment beyond the loaded or last-when...
http://issues.apache.org/jira/browse/HDFS-7501    Author: Harsh J, 2015-03-27, 09:40
[YARN-3021] YARN's delegation-token handling disallows certain trust setups to operate properly over DistCp - YARN - [issue]
...Consider this scenario of 3 realms: A, B and COMMON, where A trusts COMMON, and B trusts COMMON (one way trusts both), and both A and B run HDFS + YARN clusters.Now if one logs in with a COM...
http://issues.apache.org/jira/browse/YARN-3021    Author: Harsh J, 2015-03-26, 22:13
Re: Linux Container Executor (LCE) vs Default Container Executor(DCE) - Hadoop - [mail # user]
...This is incorrect. The DCE executes as the NodeManager process user ('yarn'typically), and the LCE in non-secure mode by default runs only as 'nobody'(or arbitrary static user) unless asked ...
   Author: Harsh J, 2015-03-26, 18:33
Re: Swap requirements - Hadoop - [mail # user]
...The suggestion (regarding swappiness) is not for disabling swap as much asit is to 'not using swap (until really necessary)'. When you run a constantmemory-consuming service such as HBase yo...
   Author: Harsh J, 2015-03-25, 22:28
Re: namenode recovery - Hadoop - [mail # user]
...Not automatically. You'd need to copy over the VERSION and fsimage* filesfrom your SecondaryNN's checkpoint directory over to the new NameNode'sconfigured name directory to start it back up ...
   Author: Harsh J, 2015-03-25, 22:25
Re: Identifying new files on HDFS - Hadoop - [mail # user]
...Look at timestamps of the file? HDFS maintains both mtimes and atimes(latter's not exposed in -ls though).In ETL context, a simple workflow system also resolves this. You have anincoming dir...
   Author: Harsh J, 2015-03-25, 21:27
Re: Can block size for namenode be different from wdatanode block size? - Hadoop - [mail # user]
...does not use this parameterActually, as a configuration, its only relevant to the client. See alsohttp://www.quora.com/How-do-I-check-HDFS-blocksize-default-customOther points sound about ri...
   Author: Harsh J, 2015-03-25, 21:21
[HADOOP-9461] JobTracker and NameNode both grant delegation tokens to non-secure clients - Hadoop - [issue]
...If one looks at the MAPREDUCE-1516 added logic in JobTracker.java's isAllowedDelegationTokenOp() method, and apply non-secure states of UGI.isSecurityEnabled == false and authMethod == SIMPL...
http://issues.apache.org/jira/browse/HADOOP-9461    Author: Harsh J, 2015-03-25, 10:42
[MAPREDUCE-4931] Add user-APIs for classpath precedence control - MapReduce - [issue]
...The feature config from MAPREDUCE-1938 of allowing tasks to start with user-classes-first is fairly popular and can use its own API hooks in Job/JobConf classes, making it easier to discover...
http://issues.apache.org/jira/browse/MAPREDUCE-4931    Author: Harsh J, 2015-03-25, 06:50
Re: Tell which reduce task run which partition - Hadoop - [mail # user]
...Your example is the reality case. The reducer ID matches its partitioninteger.On Fri, Mar 20, 2015 at 5:14 PM, xeonmailinglist-gmail <[EMAIL PROTECTED]> wrote:Harsh J ...
   Author: Harsh J, 2015-03-24, 20:18
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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