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[HDFS-6800] Support Datanode layout changes with rolling upgrade - HDFS - [issue]
...We need to handle attempts to rolling-upgrade the DataNode to a new storage directory layout.One approach is to disallow such upgrades.  If we choose this approach, we should make sure ...
http://issues.apache.org/jira/browse/HDFS-6800    Author: Colin Patrick McCabe, 2014-09-01, 22:44
[HDFS-6917] Add an hdfs debug command to validate blocks, call recoverlease, etc. - HDFS - [issue]
...HDFS should have a debug command which could validate HDFS block files, call recoverLease, and have some other functionality.  These commands would be purely for debugging and would app...
http://issues.apache.org/jira/browse/HDFS-6917    Author: Colin Patrick McCabe, 2014-08-28, 06:23
[HDFS-6957] Allow DFSClient to manually specify that a request should be traced - HDFS - [issue]
...Allow the DFSClient to manually specify that a request should be traced.  One easy way to do this might be to have a configuration property that the DFSClient reads which causes it to m...
http://issues.apache.org/jira/browse/HDFS-6957    Author: Colin Patrick McCabe, 2014-08-27, 22:04
[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
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