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[HDFS-5383] fix broken caching unit tests - HDFS - [issue]
...Looks like some recent changes are causing some PB/edit/fsimage type failures:https://builds.apache.org/job/HDFS-4949_nightly/87/testReport/...
http://issues.apache.org/jira/browse/HDFS-5383    Author: Andrew Wang, 2013-10-17, 21:31
Re: About Block related classes in hdfs package - HDFS - [mail # dev]
...Hey Yoonmin,  Unfortunately I agree it's a bit complex, especially because "Block" is sometimes used where "Replica" might be more accurate. If you find any ambiguities like this, I thi...
   Author: Andrew Wang, 2013-10-16, 07:11
[HDFS-5224] Refactor PathBasedCache* methods to use a Path rather than a String - HDFS - [issue]
...As discussed in HDFS-5213, we should refactor PathBasedCacheDirective and related methods in DistributedFileSystem to use a Path to represent paths to cache, rather than a String....
http://issues.apache.org/jira/browse/HDFS-5224    Author: Andrew Wang, 2013-10-11, 20:44
[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
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