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[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, 2014-08-25, 22:20
[HDFS-6800] Determine how Datanode layout changes should interact 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, 2014-08-25, 21:51
[HDFS-6867] For DFSOutputStream, do pipeline recovery for a single block in the background - HDFS - [issue]
...For DFSOutputStream, we should be able to do pipeline recovery in the background, while the user is continuing to write to the file.  This is especially useful for long-lived clients th...
http://issues.apache.org/jira/browse/HDFS-6867    Author: Colin Patrick McCabe, 2014-08-25, 21:26
[HDFS-3592] libhdfs should use ClientProtocol::rename2 - HDFS - [issue]
...It would be nice if libhdfs exposed rename2.  This version of rename is much more verbose about any errors that occur-- it throws AccessControlException, FileAlreadyExists, FileNotFound...
http://issues.apache.org/jira/browse/HDFS-3592    Author: Colin Patrick McCabe, 2014-08-19, 09:21
[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, 2014-07-29, 06:08
[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
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