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[HDFS-5784] reserve space in edit log header and fsimage header for feature flag section - HDFS - [issue]
...We should reserve space in the edit log header and fsimage header so that we can add layout feature flags later in a compatible manner....
http://issues.apache.org/jira/browse/HDFS-5784    Author: Colin Patrick McCabe, 2014-01-18, 00:19
[HDFS-5756] hadoopRzOptionsSetByteBufferPool does not accept NULL argument, contrary to docs - HDFS - [issue]
...hadoopRzOptionsSetByteBufferPool does not accept a NULL argument, contrary to the documentation in hdfs.h.  It should clear the existing ByteBufferPool class when a NULL is passed....
http://issues.apache.org/jira/browse/HDFS-5756    Author: Colin Patrick McCabe, 2014-01-11, 13:42
[HDFS-5651] Remove dfs.namenode.caching.enabled and improve CRM locking - HDFS - [issue]
...We can remove dfs.namenode.caching.enabled and simply always enable caching, similar to how we do with snapshots and other features.  The main overhead is the size of the cachedBlocks G...
http://issues.apache.org/jira/browse/HDFS-5651    Author: Colin Patrick McCabe, 2014-01-09, 10:46
[HDFS-5507] Consider maximum DN memory, stale status when scheduling recaching - HDFS - [issue]
...We should consider the maximum available DN memory and the stale status of the DN when scheduling recaching work....
http://issues.apache.org/jira/browse/HDFS-5507    Author: Colin Patrick McCabe, 2014-01-03, 19:19
[HDFS-5708] The CacheManager throws a NPE in the DataNode logs when processing cache reports that refer to a block not known to the BlockManager - HDFS - [issue]
...The CacheManager throws a NPE in the DataNode logs when processing cache reports that refer to a block we haven't learned about yet....
http://issues.apache.org/jira/browse/HDFS-5708    Author: Colin Patrick McCabe, 2014-01-01, 14:50
[HDFS-5694] remove duplicate PBHelper#convertDatanodeInfo method - HDFS - [issue]
...We currently have both a PBHelper#convertDatanodeInfo and a PBHelper#convert(DatanodeInfo) method.  The duplication causes maintenance overhead, and bugs when someone updates one method...
http://issues.apache.org/jira/browse/HDFS-5694    Author: Colin Patrick McCabe, 2013-12-21, 00:16
[HDFS-5634] allow BlockReaderLocal to switch between checksumming and not - HDFS - [issue]
...BlockReaderLocal should be able to switch between checksumming and non-checksumming, so that when we get notifications that something is mlocked (see HDFS-5182), we can avoid checksumming wh...
http://issues.apache.org/jira/browse/HDFS-5634    Author: Colin Patrick McCabe, 2013-12-20, 22:19
[HDFS-5676] fix inconsistent synchronization of CachingStrategy - HDFS - [issue]
...Currently, the synchronization for CachingStrategy is a little inconsistent.  DFSOutputStream#setDropBehind modifies the strategy object, but there's nothing protecting that object agai...
http://issues.apache.org/jira/browse/HDFS-5676    Author: Colin Patrick McCabe, 2013-12-19, 19:54
[HDFS-5431] support cachepool-based limit management in path-based caching - HDFS - [issue]
...We should support cachepool-based limit management in path-based caching....
http://issues.apache.org/jira/browse/HDFS-5431    Author: Colin Patrick McCabe, 2013-12-18, 14:58
[HDFS-4839] add NativeIO#mkdirs, that provides an error message on failure - HDFS - [issue]
...It would be nice to have a variant of mkdirs that provided an error message explaining why it failed.  This would make it easier to debug certain failing unit tests that rely on mkdir /...
http://issues.apache.org/jira/browse/HDFS-4839    Author: Colin Patrick McCabe, 2013-12-16, 01:48
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