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[HDFS-5841] Update HDFS caching documentation with new changes - HDFS - [issue]
...The caching documentation is a little out of date, since it's missing description of features like TTL and expiration....
http://issues.apache.org/jira/browse/HDFS-5841    Author: Andrew Wang, 2014-01-28, 23:36
[HDFS-4949] Centralized cache management in HDFS - HDFS - [issue]
...HDFS currently has no support for managing or exposing in-memory caches at datanodes. This makes it harder for higher level application frameworks like Hive, Pig, and Impala to effectively u...
http://issues.apache.org/jira/browse/HDFS-4949    Author: Andrew Wang, 2014-01-25, 13:38
[HDFS-5149] Support for federated cache pools - HDFS - [issue]
...The federation concept of a "blockpool" has not pervaded the caching implementation thus far, e.g. datanodes do not track and report usage by block pool, some namenode operations are not blo...
http://issues.apache.org/jira/browse/HDFS-5149    Author: Andrew Wang, 2014-01-22, 22:02
[HDFS-5253] Add requesting user's name to PathBasedCacheEntry - HDFS - [issue]
...It'll be useful to have the requesting user's name in PathBasedCacheEntry for tracking per-user statistics (e.g. amount of data cached by a user)....
http://issues.apache.org/jira/browse/HDFS-5253    Author: Andrew Wang, 2014-01-22, 22:00
[HDFS-5490] Add libhdfs support for getting cached block replica locations - HDFS - [issue]
...As Colin brought up in HDFS-5450, we should add support for getting cached block locations to libhdfs....
http://issues.apache.org/jira/browse/HDFS-5490    Author: Andrew Wang, 2014-01-22, 21:59
[HDFS-5589] Namenode loops caching and uncaching when data should be uncached - HDFS - [issue]
...This was reported by Chris Nauroth and Brandon Li, and Stephen Chu repro'd it too.If you add a new caching directive then remove it, the Namenode will sometimes get stuck in a loop where it ...
http://issues.apache.org/jira/browse/HDFS-5589    Author: Andrew Wang, 2014-01-10, 01:17
Re: persistent under-replicated blocks - HDFS - [mail # dev]
...Hi Chris,  BCC'ing hdfs-dev@ since you're using CDH, moving us to cdh-user@.  You should be able to manually copy the under-replicated blocks and md5 files to a different datanode ...
   Author: Andrew Wang, 2014-01-09, 21:56
[HDFS-5636] Enforce a max TTL per cache pool - HDFS - [issue]
...It'd be nice for administrators to be able to specify a maximum TTL for directives in a cache pool. This forces all directives to eventually age out....
http://issues.apache.org/jira/browse/HDFS-5636    Author: Andrew Wang, 2013-12-31, 14:45
[HDFS-5564] Refactor tests in TestCacheDirectives - HDFS - [issue]
...Some of the tests in TestCacheDirectives start their own MiniDFSCluster to get a new config, even though we already start a cluster in the @Before function. This contributes to longer test r...
http://issues.apache.org/jira/browse/HDFS-5564    Author: Andrew Wang, 2013-12-17, 21:09
[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, 2013-12-06, 13:41
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