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[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
[HDFS-5509] TestPathBasedCacheRequests#testReplicationFactor is flaky - HDFS - [issue]
...Test flakes out sometimes with the following:Running org.apache.hadoop.hdfs.server.namenode.TestPathBasedCacheRequestsTests run: 9, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 72.191 s...
http://issues.apache.org/jira/browse/HDFS-5509    Author: Andrew Wang, 2013-11-15, 19:10
[HDFS-5320] Add datanode caching metrics - HDFS - [issue]
...It'd be good to hook up datanode metrics for # (blocks/bytes) (cached/uncached/failed to cache) over different time windows (eternity/1hr/10min/1min)....
http://issues.apache.org/jira/browse/HDFS-5320    Author: Andrew Wang, 2013-11-13, 13:47
[HDFS-5495] Remove further JUnit3 usages from HDFS - HDFS - [issue]
...We're trying to move away from junit3 in hadoop to junit4. One easy way of testing for this is something like the following:-> % ack junit.framework -lhadoop-hdfs/src/test/java/org/apache...
http://issues.apache.org/jira/browse/HDFS-5495    Author: Andrew Wang, 2013-11-13, 13:47
[HDFS-5467] Remove tab characters in hdfs-default.xml - HDFS - [issue]
...The retrycache parameters are indented with tabs rather than the normal 2 spaces....
http://issues.apache.org/jira/browse/HDFS-5467    Author: Andrew Wang, 2013-11-13, 13:47
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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