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[HDFS-5950] The DFSClient and DataNode should use shared memory segments to communicate short-circuit information - HDFS - [issue]
...The DFSClient and DataNode should use the shared memory segments and unified cache added in the other HDFS-5182 subtasks to communicate short-circuit information....
http://issues.apache.org/jira/browse/HDFS-5950    Author: Colin Patrick McCabe, 2014-03-27, 21:33
[HDFS-6161] fix HDFS protobuf namespace conflicts - HDFS - [issue]
...HDFS currently puts multiple protobuf definitions with the same name in the same protobuf namespace.For example, QJournalProtocol defines HeartbeatRequestProto in package hadoop.hdfs, but Da...
http://issues.apache.org/jira/browse/HDFS-6161    Author: Colin Patrick McCabe, 2014-03-27, 19:06
[HDFS-6107] When a block can't be cached due to limited space on the DataNode, that block becomes uncacheable - HDFS - [issue]
...When a block can't be cached due to limited space on the DataNode, that block becomes uncacheable.  This is because the CachingTask fails to reset the block state in this error handling...
http://issues.apache.org/jira/browse/HDFS-6107    Author: Colin Patrick McCabe, 2014-03-18, 15:02
[HDFS-6106] Reduce default for dfs.namenode.path.based.cache.refresh.interval.ms - HDFS - [issue]
...Reduce the default for dfs.namenode.path.based.cache.refresh.interval.ms to improve the responsiveness of caching....
http://issues.apache.org/jira/browse/HDFS-6106    Author: Colin Patrick McCabe, 2014-03-15, 14:58
[HDFS-6097] zero-copy reads are incorrectly disabled on file offsets above 2GB - HDFS - [issue]
...Zero-copy reads are incorrectly disabled on file offsets above 2GB due to some code that is supposed to disable zero-copy reads on offsets in block files greater than 2GB (because MappedByte...
http://issues.apache.org/jira/browse/HDFS-6097    Author: Colin Patrick McCabe, 2014-03-14, 14:56
[HDFS-6086] Fix a case where zero-copy or no-checksum reads were not allowed even when the block was cached - HDFS - [issue]
...We need to fix a case where zero-copy or no-checksum reads are not allowed even when the block is cached.  The case is when the block is cached before the REQUEST_SHORT_CIRCUIT_FDS oper...
http://issues.apache.org/jira/browse/HDFS-6086    Author: Colin Patrick McCabe, 2014-03-12, 14:59
[HDFS-4461] DirectoryScanner: volume path prefix takes up memory for every block that is scanned - HDFS - [issue]
...In the DirectoryScanner, we create a class ScanInfo for every block.  This object contains two File objects-- one for the metadata file, and one for the block file.  Since those Fi...
http://issues.apache.org/jira/browse/HDFS-4461    Author: Colin Patrick McCabe, 2014-03-11, 21:16
[HDFS-6085] Improve CacheReplicationMonitor log messages a bit - HDFS - [issue]
...It would be nice if the CacheReplicationMonitor logs would print out information about blocks when at TRACE level.  We also could be a bit more organized about logs and include the dire...
http://issues.apache.org/jira/browse/HDFS-6085    Author: Colin Patrick McCabe, 2014-03-11, 14:59
[HDFS-6071] BlockReaderLocal doesn't return -1 on EOF when doing a zero-length read on a short file - HDFS - [issue]
...BlockReaderLocal doesn't return -1 on EOF when doing a zero-length read on a short file.  Specifically, if the file is shorter than the readahead buffer, or if the position is nearer to...
http://issues.apache.org/jira/browse/HDFS-6071    Author: Colin Patrick McCabe, 2014-03-10, 14:53
[HDFS-6065] HDFS zero-copy reads should return null on EOF when doing ZCR - HDFS - [issue]
...It would be nice if the HDFS zero-copy reads mechanism returned an empty buffer on EOF.  Currently, it throws UnsupportedOperationException on EOF when using zero-copy reads, which seem...
http://issues.apache.org/jira/browse/HDFS-6065    Author: Colin Patrick McCabe, 2014-03-07, 01:37
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