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[HDFS-7430] Rewrite 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, 2015-01-31, 01:22
[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, 2015-01-31, 00:46
[HDFS-7693] libhdfs: add hdfsFile cache - HDFS - [issue]
...Add an hdfsFile cache inside libhdfs....
http://issues.apache.org/jira/browse/HDFS-7693    Author: Colin Patrick McCabe, 2015-01-29, 19:56
[HDFS-7698] Fix locking on HDFS read statistics and add a method for clearing them. - HDFS - [issue]
...Fix locking on HDFS read statistics and add a method for clearing them....
http://issues.apache.org/jira/browse/HDFS-7698    Author: Colin Patrick McCabe, 2015-01-29, 06:32
[HDFS-7694] FSDataInputStream should support "unbuffer" - HDFS - [issue]
...For applications that have many open HDFS (or other Hadoop filesystem) files, it would be useful to have an API to clear readahead buffers and sockets.  This could be added to the exist...
http://issues.apache.org/jira/browse/HDFS-7694    Author: Colin Patrick McCabe, 2015-01-29, 02:00
[HDFS-7654] TestFileTruncate#testTruncateEditLogLoad fails intermittently - HDFS - [issue]
...TestFileTruncate#testTruncateEditLogLoad fails intermittently with an error message like this: java.io.IOException: Timed out waiting for Mini HDFS Cluster to start at org.apache.hadoop.hdfs...
http://issues.apache.org/jira/browse/HDFS-7654    Author: Colin Patrick McCabe, 2015-01-26, 21:34
[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, 2015-01-26, 21:05
[HDFS-7055] Add tracing to DFSInputStream - HDFS - [issue]
...Add tracing to DFSInputStream....
http://issues.apache.org/jira/browse/HDFS-7055    Author: Colin Patrick McCabe, 2015-01-25, 00:07
[HDFS-7496] Fix FsVolume removal race conditions on the DataNode by reference-counting the volume instances - 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, 2015-01-22, 19:29
[HDFS-4173] If the NameNode has already been formatted, but a QuroumJournal has not, auto-format it on startup - HDFS - [issue]
...If we have multiple edit log directories, and some of them are formatted, but others are not, we format the unformatted ones.  However, when we implemented QuorumJournalManager, we did ...
http://issues.apache.org/jira/browse/HDFS-4173    Author: Colin Patrick McCabe, 2015-01-22, 01:20
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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