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[HDFS-7411] Refactor and improve decommissioning logic into DecommissionManager - HDFS - [issue]
...Would be nice to split out decommission logic from DatanodeManager to DecommissionManager....
http://issues.apache.org/jira/browse/HDFS-7411    Author: Andrew Wang, 2015-01-24, 01:39
Re: Understanding Network Utilization of TeraSort - HDFS - [mail # dev]
...Hi Eitan,Is it possible you have speculative execution enabled? Check to make surethe # of tasks being run matches up with your expectations.You could also try running the same measurements ...
   Author: Andrew Wang, 2015-01-13, 06:02
[HDFS-7426] Change nntop JMX format to be a JSON blob - HDFS - [issue]
...After discussion with Maysam Yabandeh, we think we can adjust the JMX output to instead be a richer JSON blob. This should be easier to parse and also be more informative....
http://issues.apache.org/jira/browse/HDFS-7426    Author: Andrew Wang, 2014-12-13, 15:25
[HDFS-6102] Lower the default maximum items per directory to fix PB fsimage loading - HDFS - [issue]
...Found by Stephen Chu during testing. We were creating a bunch of directories in a single directory to blow up the fsimage size, and it ends up we hit this error when trying to load a very la...
http://issues.apache.org/jira/browse/HDFS-6102    Author: Andrew Wang, 2014-12-05, 19:35
[HDFS-7047] Expose FileStatus#isEncrypted in libhdfs - HDFS - [issue]
http://issues.apache.org/jira/browse/HDFS-7047    Author: Andrew Wang, 2014-12-01, 03:12
[HDFS-7409] Allow dead nodes to finish decommissioning if all files are fully replicated - HDFS - [issue]
...As discussed on HDFS-7374, we can allow safely allow dead nodes in DECOMMISSION_IN_PROGRESS to progress to DECOMMISSIONED state if all files on the filesystem are fully-replicated....
http://issues.apache.org/jira/browse/HDFS-7409    Author: Andrew Wang, 2014-11-20, 15:25
[HDFS-7405] TestDatanodeBlockScanner#testDuplicateScans hangs - HDFS - [issue]
...Seen on some precommit runs, also observed locally....
http://issues.apache.org/jira/browse/HDFS-7405    Author: Andrew Wang, 2014-11-18, 22:56
Re: Why do reads take as long as replicated writes? - HDFS - [mail # dev]
...I would advise against using TestDFSIO, instead trying TeraGen andTeraValidate. IIRC TestDFSIO doesn't actually schedule for task locality,so it's not very good if you have a cluster bigger ...
   Author: Andrew Wang, 2014-11-04, 23:43
[HDFS-7318] Rename some of the policies in default StoragePolicySuite - HDFS - [issue]
...Right now we have default policies named based on temperature, e.g. HOT, COLD, but also the storage type like ONESSD, ALLSSD, MEMORY. This seems inconsistent, let's consider renaming....
http://issues.apache.org/jira/browse/HDFS-7318    Author: Andrew Wang, 2014-10-31, 21:44
[HDFS-7317] Rename StoragePolicy - HDFS - [issue]
...As discussed on HDFS-7285, StoragePolicy might not be the best name for what StoragePolicy currently is, which is a hardcoded mapping to replica StorageTypes with a fallback, and being able ...
http://issues.apache.org/jira/browse/HDFS-7317    Author: Andrew Wang, 2014-10-31, 21:34
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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