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[HDFS-5746] add ShortCircuitSharedMemorySegment - HDFS - [issue]
...Add ShortCircuitSharedMemorySegment, which will be used to communicate information between the datanode and the client about whether a replica is mlocked....
http://issues.apache.org/jira/browse/HDFS-5746    Author: Colin Patrick McCabe, 2014-02-07, 14:52
[HDFS-5182] BlockReaderLocal must allow zero-copy  reads only when the DN believes it's valid - HDFS - [issue]
...BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid.  This implies adding a new field to the response to REQUEST_SHORT_CIRCUIT_FDS.  We also need some ...
http://issues.apache.org/jira/browse/HDFS-5182    Author: Colin Patrick McCabe, 2014-02-05, 22:37
[HDFS-5164] deleteSnapshot should check if OperationCategory.WRITE is possible before taking write lock - HDFS - [issue]
...deleteSnapshot should check if OperationCategory.WRITE is possible before taking the write lock, to help avoid lock contention...
http://issues.apache.org/jira/browse/HDFS-5164    Author: Colin Patrick McCabe, 2014-01-28, 23:36
[HDFS-5666] Fix inconsistent synchronization in BPOfferService - HDFS - [issue]
...TestBPOfferService#testBPInitErrorHandling fails intermittently.  We believe it's because of inconsistent synchronization in BPOfferService.stack trace:Regressionorg.apache.hadoop.hdfs....
http://issues.apache.org/jira/browse/HDFS-5666    Author: Colin Patrick McCabe, 2014-01-28, 23:36
[HDFS-5534] change testUncachingBlocksBeforeCachingFinishes to use explicit synchronization rather than a delay - HDFS - [issue]
...It would be nice for testUncachingBlocksBeforeCachingFinishes to use explicit synchronization rather than a delay, to ensure that we are testing the try-to-cache-but-uncache-before-it-finish...
http://issues.apache.org/jira/browse/HDFS-5534    Author: Colin Patrick McCabe, 2014-01-22, 21:58
[HDFS-5092] Add support for incremental cache reports - HDFS - [issue]
...The initial cacheReport patch at HDFS-5051 does frequent full reports of DN cache state. Better would be a scheme similar to how block reports are currently done: send incremental cache repo...
http://issues.apache.org/jira/browse/HDFS-5092    Author: Colin Patrick McCabe, 2014-01-22, 21:56
[HDFS-4019] FSShell should support creating symlinks - HDFS - [issue]
...FSShell should support creating symlinks.  This would allow users to create symlinks from the shell without having to write a Java program.One thing that makes this complicated is that ...
http://issues.apache.org/jira/browse/HDFS-4019    Author: Colin Patrick McCabe, 2014-01-22, 03:38
[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
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