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[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-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
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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