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[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-7430] Refactor the BlockScanner to use O(1) memory and use multiple threads - HDFS - [issue]
...We should update the BlockScanner to use a constant amount of memory by keeping track of what block was scanned last, rather than by tracking the scan status of all blocks in memory.  A...
http://issues.apache.org/jira/browse/HDFS-7430    Author: Colin Patrick McCabe, 2014-12-17, 23:48
[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-7496] Fix FsVolume removal race conditions on the DataNode - HDFS - [issue]
...We discussed a few FsVolume removal race conditions on the DataNode in HDFS-7489.  We should figure out a way to make removing an FsVolume safe....
http://issues.apache.org/jira/browse/HDFS-7496    Author: Colin Patrick McCabe, 2014-12-16, 04:48
[HDFS-7520] checknative should display a nicer error message when openssl support is not compiled in - HDFS - [issue]
...checknative should display a nicer error message when openssl support is not compiled in.  Currently, it displays this:[cmccabe@keter hadoop]$ hadoop checknative14/12/12 14:08:43 INFO b...
http://issues.apache.org/jira/browse/HDFS-7520    Author: Colin Patrick McCabe, 2014-12-13, 02:00
[HDFS-7492] If multiple threads call FsVolumeList#checkDirs at the same time, we should only do checkDirs once and give the results to all waiting threads - HDFS - [issue]
...checkDirs is called when we encounter certain I/O errors.  It's rare to get just a single I/O error... normally you start getting many errors when a disk is going bad.  For this re...
http://issues.apache.org/jira/browse/HDFS-7492    Author: Colin Patrick McCabe, 2014-12-08, 22:18
[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, 2014-12-03, 15:50
[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-7341] Add initial snapshot support based on pipeline recovery - HDFS - [issue]
...Add initial snapshot support based on pipeline recovery.  This iteration does not support snapshots or rollback.  This support will be added in the HDFS-3107 branch by later subtas...
http://issues.apache.org/jira/browse/HDFS-7341    Author: Colin Patrick McCabe, 2014-11-04, 02:32
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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