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[HDFS-3672] Expose disk-location information for blocks to enable better scheduling - HDFS - [issue]
...Currently, HDFS exposes on which datanodes a block resides, which allows clients to make scheduling decisions for locality and load balancing. Extending this to also expose on which disk on ...
http://issues.apache.org/jira/browse/HDFS-3672    Author: Andrew Wang, 2013-10-09, 22:45
[HDFS-5304] Expose if a block replica is cached in getFileBlockLocations - HDFS - [issue]
...We need to expose which replicas of a block are cached so applications can place their tasks for memory-locality....
http://issues.apache.org/jira/browse/HDFS-5304    Author: Andrew Wang, 2013-10-09, 22:30
[HDFS-5309] Fix failing caching unit tests - HDFS - [issue]
...Couple failing units because of slightly-bad commits on the HDFS-4949 branch...
http://issues.apache.org/jira/browse/HDFS-5309    Author: Andrew Wang, 2013-10-06, 18:06
[HDFS-3650] Use MutableQuantiles to provide latency histograms for various operations - HDFS - [issue]
...MutableQuantiles provide accurate estimation of various percentiles for a stream of data. Many existing metrics reported by a MutableRate would also benefit from having these percentiles; le...
http://issues.apache.org/jira/browse/HDFS-3650    Author: Andrew Wang, 2013-10-02, 19:03
[HDFS-5236] Change PathBasedCacheDirective APIs to be a single value rather than batch - HDFS - [issue]
...It's kind of awkward that APIs like addPathBasedCacheDirective take a list of Directives and return a list of Fallibles, since end users don't see a checked exception and need to check each ...
http://issues.apache.org/jira/browse/HDFS-5236    Author: Andrew Wang, 2013-09-27, 23:11
[HDFS-4680] Audit logging of delegation tokens for MR tracing - HDFS - [issue]
...HDFS audit logging tracks HDFS operations made by different users, e.g. creation and deletion of files. This is useful for after-the-fact root cause analysis and security. However, logging m...
http://issues.apache.org/jira/browse/HDFS-4680    Author: Andrew Wang, 2013-09-25, 00:33
Re: symlink support in Hadoop 2 GA - HDFS - [mail # dev]
...It's an incompatible change. Existing APIs like listStatus and globStatus need to be symlink aware now, which can break assumptions of user code. We've had FileStatus#isSymlink() since the e...
   Author: Andrew Wang, 2013-09-18, 19:13
[HDFS-5210] Fix some failing unit tests on HDFS-4949 branch - HDFS - [issue]
...Looking at the nightly build, looks like there are a few small errors leading to unit test failures....
http://issues.apache.org/jira/browse/HDFS-5210    Author: Andrew Wang, 2013-09-16, 19:42
[HDFS-5174] Convert DFSAdmin to use a standard library for parsing arguments - HDFS - [issue]
...Right now, DFSAdmin uses an array of different techniques to do parsing of command line arguments and displaying help text. It'd be better to unify everything to use a standard library like ...
http://issues.apache.org/jira/browse/HDFS-5174    Author: Andrew Wang, 2013-09-10, 20:35
[HDFS-5170] BlockPlacementPolicyDefault uses the wrong classname when alerting to enable debug logging - HDFS - [issue]
...  private static final String enableDebugLogging =    "For more information, please enable DEBUG log level on "    + LOG.getClass().getName();This ins...
http://issues.apache.org/jira/browse/HDFS-5170    Author: Andrew Wang, 2013-09-09, 15:04
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