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[HDFS-7189] Add trace spans for DFSClient metadata operations - HDFS - [issue]
...We should add trace spans for DFSClient metadata operations.  For example, DFSClient#rename should have a trace span, etc. etc....
http://issues.apache.org/jira/browse/HDFS-7189    Author: Colin Patrick McCabe, 2015-01-16, 15:41
[HDFS-7326] Add documentation for hdfs debug commands - HDFS - [issue]
...We should add documentation for hdfs debug commands....
http://issues.apache.org/jira/browse/HDFS-7326    Author: Colin Patrick McCabe, 2015-01-13, 15:34
[HDFS-7446] HDFS inotify should have the ability to determine what txid it has read up to - HDFS - [issue]
...HDFS inotify should have the ability to determine what txid it has read up to.  This will allow users who want to avoid missing any events to record this txid and use it to resume readi...
http://issues.apache.org/jira/browse/HDFS-7446    Author: Colin Patrick McCabe, 2015-01-09, 03:10
[HDFS-7556] HardLink.java should use the jdk7 createLink method - HDFS - [issue]
...Now that we are using jdk7, HardLink.java should use the jdk7 createLink method rather than our shell commands or JNI methods.Note that we cannot remove all of the JNI / shell commands unles...
http://issues.apache.org/jira/browse/HDFS-7556    Author: Colin Patrick McCabe, 2014-12-29, 20:37
[HDFS-7557] Fix spacing for a few keys in DFSConfigKeys.java - HDFS - [issue]
...A few configuration keys in DFSConfigKeys.java are spaced with 3 spaces rather than 2; let's fix this...
http://issues.apache.org/jira/browse/HDFS-7557    Author: Colin Patrick McCabe, 2014-12-22, 15:31
[HDFS-7544] ChunkedArrayList: fix removal via iterator and implement get - HDFS - [issue]
...ChunkedArrayList: implement removal via iterator and get.  Previously, calling remove on a ChunkedArrayList iterator would cause the returned size to be incorrect later....
http://issues.apache.org/jira/browse/HDFS-7544    Author: Colin Patrick McCabe, 2014-12-18, 01:39
[HDFS-7540] Add IOUtils#listDirectory - HDFS - [issue]
...We should have a drop-in replacement for File#listDir that doesn't hide IOExceptions, and which returns a ChunkedArrayList rather than a single large array....
http://issues.apache.org/jira/browse/HDFS-7540    Author: Colin Patrick McCabe, 2014-12-17, 20:21
[HDFS-7513] HDFS inotify: add defaultBlockSize to CreateEvent - HDFS - [issue]
...HDFS inotify: add defaultBlockSize to CreateEvent...
http://issues.apache.org/jira/browse/HDFS-7513    Author: Colin Patrick McCabe, 2014-12-16, 15:10
[HDFS-7325] Prevent thundering herd problem in ByteArrayManager by using notify not notifyAll - HDFS - [issue]
...Currently ByteArrayManager wakes all waiting threads whenever a byte array is released and count == limit.  However, only one thread can proceed.    With a large number of wai...
http://issues.apache.org/jira/browse/HDFS-7325    Author: Colin Patrick McCabe, 2014-11-05, 19:17
[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, 2014-11-03, 19:13
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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