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[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-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, 2015-01-22, 15:23
[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
[HDFS-7646] HDFS truncate may remove data from the supposedly read-only previous/ directory during an upgrade - HDFS - [issue]
...During a DataNode layout version upgrade, HDFS creates hardlinks.  These hardlinks allow the same block to be accessible from both the current/ and previous/ directories.  Rollback...
http://issues.apache.org/jira/browse/HDFS-7646    Author: Colin Patrick McCabe, 2015-01-21, 04:05
[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
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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