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[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
[HDFS-4504] DFSOutputStream#close doesn't always release resources (such as leases) - HDFS - [issue]
...DFSOutputStream#close can throw an IOException in some cases.  One example is if there is a pipeline error and then pipeline recovery fails.  Unfortunately, in this case, some of t...
http://issues.apache.org/jira/browse/HDFS-4504    Author: Colin Patrick McCabe, 2014-02-26, 03:36
[HDFS-5938] Make BlockReaderFactory#BlockReaderPeer a static class - HDFS - [issue]
...Make BlockReaderFactory#BlockReaderPeer a static class to avoid a findbugs warning....
http://issues.apache.org/jira/browse/HDFS-5938    Author: Colin Patrick McCabe, 2014-02-13, 14:53
[HDFS-5940] Minor cleanups to ShortCircuitReplica, FsDatasetCache, and DomainSocketWatcher - HDFS - [issue]
...ShortCircuitReplica#Key and FsDatasetCache#Key are pretty much identical code and should be factored out to an external class.  (There will soon be a need for a third user of such an id...
http://issues.apache.org/jira/browse/HDFS-5940    Author: Colin Patrick McCabe, 2014-02-13, 14:53
[HDFS-4911] Reduce PeerCache timeout to be commensurate with dfs.datanode.socket.reuse.keepalive - HDFS - [issue]
...The default timeout for the client's PeerCache is much longer than the DataNode would possibly keep the socket open.  Specifically, dfs.client.socketcache.expiryMsec defaults to 2 *60 *...
http://issues.apache.org/jira/browse/HDFS-4911    Author: Colin Patrick McCabe, 2014-02-07, 14:52
[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
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