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[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, 2014-09-03, 21:50
[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, 2014-09-03, 20:28
[HDFS-6956] Allow dynamically changing the tracing level in Hadoop servers - HDFS - [issue]
...We should allow users to dynamically change the tracing level in Hadoop servers.  The easiest way to do this is probably to have an RPC accessible only to the superuser that changes tra...
http://issues.apache.org/jira/browse/HDFS-6956    Author: Colin Patrick McCabe, 2014-09-03, 00:37
[HDFS-6985] Add final keywords, documentation, etc. to ReplaceDatanodeOnFailure - HDFS - [issue]
...use final qualifier and variable names consistently in ReplaceDatanodeOnFailure#Condition classes add a debug log message in the DFSClient explaining which pipeline failure policy is being u...
http://issues.apache.org/jira/browse/HDFS-6985    Author: Colin Patrick McCabe, 2014-09-02, 23:46
[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-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
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB