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[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, 2015-07-09, 20:19
[HDFS-8681] BlockScanner is incorrectly disabled by default - HDFS - [issue]
...This code is used to check whether the block scanner is enabled:  public boolean isEnabled() {    return (conf.scanPeriodMs) > 0 && (conf.targetBytesPerSec > 0);...
http://issues.apache.org/jira/browse/HDFS-8681    Author: Andrew Wang, 2015-07-07, 22:47
[HDFS-8709] Clarify automatic sync in FSEditLog#logEdit - HDFS - [issue]
...The code flow and comments regarding the logSync() in logEdit() is a little messy, could be improved....
http://issues.apache.org/jira/browse/HDFS-8709    Author: Andrew Wang, 2015-07-04, 17:37
[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, 2015-06-30, 08:25
[HDFS-8546] Use try with resources in DataStorage and Storage - HDFS - [issue]
...We have some old-style try/finally to close files in DataStorage and Storage, let's update them.Also a few small cleanups: Actually check that tryLock returns a FileLock in isPreUpgradableLa...
http://issues.apache.org/jira/browse/HDFS-8546    Author: Andrew Wang, 2015-06-26, 15:35
[HDFS-8646] Prune cached replicas from DatanodeDescriptor state on replica invalidation - HDFS - [issue]
...Currently we remove blocks from the DD's CachedBlockLists on node failure and on cache report, but not on replica invalidation. This can lead to an invalid situation where we return a Locate...
http://issues.apache.org/jira/browse/HDFS-8646    Author: Andrew Wang, 2015-06-24, 00:18
[HDFS-8591] Remove support for deprecated configuration key dfs.namenode.decommission.nodes.per.interval - HDFS - [issue]
...dfs.namenode.decommission.nodes.per.interval is deprecated in branch-2 and can be removed in trunk....
http://issues.apache.org/jira/browse/HDFS-8591    Author: Andrew Wang, 2015-06-17, 20:09
[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, 2015-06-16, 18:05
[HDFS-7048] Incorrect Balancer#Source wait/notify leads to early termination - HDFS - [issue]
...Split off from HDFS-6621. The Balancer attempts to wake up scheduler threads early as sources finish, but the synchronization with wait and notify is incorrect. This ticks the failure count,...
http://issues.apache.org/jira/browse/HDFS-7048    Author: Andrew Wang, 2015-06-16, 11:19
Re: Key Rotation in Data-at-Rest Encryption - HDFS - [mail # dev]
...Hi Sitaraman,A key name can have multiple versions. When you roll a key (via its name),a new version is created. When you fetch a key via name, you get thecurrent version. You can also expli...
   Author: Andrew Wang, 2015-06-15, 21:57
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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