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[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, 2014-11-21, 19:43
[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-7411] Refactor 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, 2014-11-20, 05:36
[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
[HDFS-7165] Separate block metrics for files with replication count 1 - HDFS - [issue]
...We see a lot of escalations because someone has written teragen output with a replication factor of 1, a DN goes down, and a bunch of missing blocks show up. These are normally false positiv...
http://issues.apache.org/jira/browse/HDFS-7165    Author: Andrew Wang, 2014-10-30, 17:21
[HDFS-6824] Additional user documentation for HDFS encryption. - HDFS - [issue]
...We'd like to better document additional things about HDFS encryption: setup and configuration, using alternate access methods (namely WebHDFS and HttpFS), other misc improvements....
http://issues.apache.org/jira/browse/HDFS-6824    Author: Andrew Wang, 2014-10-22, 22:43
[expand - 1 more] - Re: HDFS Snapshots - HDFS - [mail # dev]
...Why would the state go backwards? Let me try to restate your scenario:t1: snapshot a file with length 5t2: append to the file, now length 6t3: delete the snapshotAfter this, since we deleted...
   Author: Andrew Wang, 2014-10-21, 15:19
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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