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[HDFS-6709] Implement off-heap data structures for NameNode and other HDFS memory optimization - HDFS - [issue]
...We should investigate implementing off-heap data structures for NameNode and other HDFS memory optimization.  These data structures could reduce latency by avoiding the long GC times th...
http://issues.apache.org/jira/browse/HDFS-6709    Author: Colin Patrick McCabe, 2014-07-28, 15:55
[HDFS-6750] The DataNode should use its shared memory segment to mark short-circuit replicas that have been unlinked as stale - HDFS - [issue]
...The DataNode should mark short-circuit replicas that have been unlinked as stale.  This would prevent replicas that had been deleted from lingering in the DFSClient cache.  (At lea...
http://issues.apache.org/jira/browse/HDFS-6750    Author: Colin Patrick McCabe, 2014-07-26, 15:59
[HDFS-3607] log a message when fuse_dfs is not built - HDFS - [issue]
...We should log a message when fuse_dfs is not built explaining why...
http://issues.apache.org/jira/browse/HDFS-3607    Author: Colin Patrick McCabe, 2014-07-25, 23:31
[HDFS-6450] Support non-positional hedged reads in HDFS - HDFS - [issue]
...HDFS-5776 added support for hedged positional reads.  We should also support hedged non-position reads (aka regular reads)....
http://issues.apache.org/jira/browse/HDFS-6450    Author: Colin Patrick McCabe, 2014-07-21, 21:03
[HDFS-6695] Investigate using Java 7's nonblocking file I/O in BlockReaderLocal to implement read timeouts - HDFS - [issue]
...In BlockReaderLocal, the "read" system call could block for a long time if the disk drive is having problems, or there is a huge amount of I/O contention.  This might cause poor latency...
http://issues.apache.org/jira/browse/HDFS-6695    Author: Colin Patrick McCabe, 2014-07-17, 19:20
[HDFS-5202] Support Centralized Cache Management on Windows. - HDFS - [issue]
...HDFS caching currently is implemented using POSIX syscalls for checking ulimit and locking pages of memory into the process's address space.  These POSIX syscalls do not exist on Window...
http://issues.apache.org/jira/browse/HDFS-5202    Author: Colin Patrick McCabe, 2014-07-11, 14:56
[HDFS-5049] Add JNI mlock support - HDFS - [issue]
...Add support for mlock and munlock, for use in caching....
http://issues.apache.org/jira/browse/HDFS-5049    Author: Colin Patrick McCabe, 2014-07-10, 20:12
[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, 2014-07-10, 01:21
[HDFS-5546] race condition crashes "hadoop ls -R" when directories are moved/removed - HDFS - [issue]
...This seems to be a rare race condition where we have a sequence of events like this:1. org.apache.hadoop.shell.Ls calls DFS#getFileStatus on directory D.2. someone deletes or moves directory...
http://issues.apache.org/jira/browse/HDFS-5546    Author: Colin Patrick McCabe, 2014-06-25, 20:40
[HDFS-6497] Make TestAvailableSpaceVolumeChoosingPolicy deterministic - HDFS - [issue]
...We should make TestAvailableSpaceVolumeChoosingPolicy deterministic to avoid random failures.  We can do this by setting the seed for the random number generator explicitly in the test....
http://issues.apache.org/jira/browse/HDFS-6497    Author: Colin Patrick McCabe, 2014-06-07, 16:15
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