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[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-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
[HDFS-4538] allow use of legacy blockreader - HDFS - [issue]
...Some users might want to use the legacy block reader, because it is available on Windows, whereas the secure solution has not yet been implemented there.  As described in the mailing li...
http://issues.apache.org/jira/browse/HDFS-4538    Author: Colin Patrick McCabe, 2014-03-04, 02:35
[HDFS-4953] enable HDFS local reads via mmap - HDFS - [issue]
...Currently, the short-circuit local read pathway allows HDFS clients to access files directly without going through the DataNode.  However, all of these reads involve a copy at the opera...
http://issues.apache.org/jira/browse/HDFS-4953    Author: Colin Patrick McCabe, 2014-03-04, 02:35
[HDFS-3440] should more effectively limit stream memory consumption when reading corrupt edit logs - HDFS - [issue]
...Currently, we do in.mark(100MB) before reading an opcode out of the edit log.  However, this could result in us usin all of those 100 MB when reading bogus data, which is not what we wa...
http://issues.apache.org/jira/browse/HDFS-3440    Author: Colin Patrick McCabe, 2014-03-03, 19:16
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