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[HDFS-5564] Refactor tests in TestCacheDirectives - HDFS - [issue]
...Some of the tests in TestCacheDirectives start their own MiniDFSCluster to get a new config, even though we already start a cluster in the @Before function. This contributes to longer test r...
http://issues.apache.org/jira/browse/HDFS-5564    Author: Andrew Wang, 2013-12-17, 21:09
[HDFS-5630] Hook up cache directive and pool usage statistics - HDFS - [issue]
...Right now we have stubs for bytes/files statistics for cache pools, but we need to hook them up so they're actually being tracked.This is a pre-requisite for enforcing per-pool quotas....
http://issues.apache.org/jira/browse/HDFS-5630    Author: Andrew Wang, 2013-12-06, 13:41
[HDFS-5551] Rename "path.based" caching configuration options - HDFS - [issue]
...Some configuration options still have the "path.based" moniker, missed during the big rename removing this naming convention....
http://issues.apache.org/jira/browse/HDFS-5551    Author: Andrew Wang, 2013-12-05, 21:03
[HDFS-5565] CacheAdmin help should match against non-dashed commands - HDFS - [issue]
...Using the shell, `hdfs dfsadmin -help refreshNamespace` returns help text, but for cacheadmin, you have to specify `hdfs cacheadmin -help -addDirective` with a dash before the command name. ...
http://issues.apache.org/jira/browse/HDFS-5565    Author: Andrew Wang, 2013-11-27, 13:27
[HDFS-5473] Consistent naming of user-visible caching classes and methods - HDFS - [issue]
...It's kind of warty that (after HDFS-5326 goes in) DistributedFileSystem has *CachePool methods take a CachePoolInfo and *PathBasedCacheDirective methods that thake a PathBasedCacheDirective....
http://issues.apache.org/jira/browse/HDFS-5473    Author: Andrew Wang, 2013-11-22, 13:27
[expand - 1 more] - Re: Metrics2 code - HDFS - [mail # dev]
...I'm not sure how Ganglia works, but I suspect that it's polling the metric every 10 seconds and taking the difference to give you the bytes written in the last 10 seconds, and divide that by...
   Author: Andrew Wang, 2013-11-21, 18:49
Re: issue about rpc activity metrics - HDFS - [mail # dev]
...The metrics system generates a number of different entries per in-code metrics object. For instance, the "SendHeartbeat"  MutableRate will generate both "NumOps" and "AvgTime". Look in ...
   Author: Andrew Wang, 2013-11-20, 17:00
Re: when datanode will delete these invalidate blocks? - HDFS - [mail # dev]
...Try looking in the heartbeat code on the NN and DN, it should clear things up. The namenode sends these block invalidations to the DN on the DN heartbeat response. The DN then deletes the bl...
   Author: Andrew Wang, 2013-11-19, 05:46
[HDFS-5524] NPE during Namenode startup in Server#getNumConnections - HDFS - [issue]
...Saw this stacktrace while starting up a trunk namenode, maybe a race between starting the RPC server and the metrics system?13/11/18 14:49:32 ERROR lib.MethodMetric: Error invoking method nu...
http://issues.apache.org/jira/browse/HDFS-5524    Author: Andrew Wang, 2013-11-19, 00:57
[expand - 3 more] - Re: HDFS read/write data throttling - HDFS - [mail # dev]
...https://issues.apache.org/jira/browse/HDFS-5499   On Mon, Nov 18, 2013 at 10:46 AM, Jay Vyas  wrote:  ...
   Author: Andrew Wang, 2013-11-18, 21:25
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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