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[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
[HDFS-6067] TestPread.testMaxOutHedgedReadPool is flaky - HDFS - [issue]
...TestPread.testMaxOutHedgedReadPool is flaky, giving assertions like this:java.lang.AssertionError: null at org.junit.Assert.fail(Assert.java:92) at org.junit.Assert.assertTrue(Assert.java:43...
http://issues.apache.org/jira/browse/HDFS-6067    Author: Colin Patrick McCabe, 2014-03-07, 00:28
[HDFS-5762] BlockReaderLocal doesn't return -1 on EOF when doing zero-length reads - HDFS - [issue]
...Unlike the other block readers, BlockReaderLocal currently doesn't return -1 on EOF when doing zero-length reads.  This behavior, in turn, propagates to the DFSInputStream.  BlockR...
http://issues.apache.org/jira/browse/HDFS-5762    Author: Colin Patrick McCabe, 2014-03-06, 23:33
[HDFS-6061] Allow dfs.datanode.shared.file.descriptor.path to contain multiple entries and fall back when needed - HDFS - [issue]
...In SharedFileDescriptorFactory, it would be nice if dfs.datanode.shared.file.descriptor.path could contain multiple entries and allow fallback between them.  That way, if a user doesn't...
http://issues.apache.org/jira/browse/HDFS-6061    Author: Colin Patrick McCabe, 2014-03-06, 14:53
[HDFS-6036] Forcibly timeout misbehaving DFSClients that try to do no-checksum reads that extend too long - HDFS - [issue]
...We should forcibly timeout misbehaving DFSClients that try to do no-checksum reads that extend too long....
http://issues.apache.org/jira/browse/HDFS-6036    Author: Colin Patrick McCabe, 2014-03-05, 23:44
[HDFS-6040] fix DFSClient issue without libhadoop.so and some other ShortCircuitShm cleanups - HDFS - [issue]
...clean up some extra imports in ShortCircuitShm fix or suppress bogus findbugs warnings throw an IOException rather than RuntimeException when the client asks the server for a bogus slot inde...
http://issues.apache.org/jira/browse/HDFS-6040    Author: Colin Patrick McCabe, 2014-03-04, 20:24
[HDFS-6046] add dfs.client.mmap.enabled - HDFS - [issue]
...It would be nice to have a configuration variable, dfs.client.mmap.enabled. which would disable mmap reads in the client.  This could come in handy for debugging or performance benchmar...
http://issues.apache.org/jira/browse/HDFS-6046    Author: Colin Patrick McCabe, 2014-03-04, 14:53
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