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[HDFS-4828] Make QJM epoch-related errors more understandable - HDFS - [issue]
...Since we started running QJM on production clusters, we've found that users are very confused by some of the error messages that it produces. For example, when a failover occurs and an old N...
http://issues.apache.org/jira/browse/HDFS-4828    Author: Todd Lipcon, 2013-05-16, 19:14
[HDFS-4300] TransferFsImage.downloadEditsToStorage should use a tmp file for destination - HDFS - [issue]
...Currently, in TransferFsImage.downloadEditsToStorage, we download the edits file directly to its finalized path. So, if the transfer fails in the middle, a half-written file is left and cann...
http://issues.apache.org/jira/browse/HDFS-4300    Author: Todd Lipcon, 2013-05-14, 15:06
[HDFS-3653] 1.x: Add a retention period for purged edit logs - HDFS - [issue]
...Occasionally we have a bug which causes something to go wrong with edits files. Even more occasionally the bug is such that the namenode mistakenly deletes an edits file without merging it i...
http://issues.apache.org/jira/browse/HDFS-3653    Author: Todd Lipcon, 2013-05-14, 06:12
[HDFS-4799] Corrupt replica can be prematurely removed from corruptReplicas map - HDFS - [issue]
...We saw the following sequence of events in a cluster result in losing the most recent genstamp of a block: client is writing to a pipeline of 3 the pipeline had nodes fail over some period o...
http://issues.apache.org/jira/browse/HDFS-4799    Author: Todd Lipcon, 2013-05-11, 15:06
[HDFS-3962] NN should periodically check writability of 'required' journals - HDFS - [issue]
...Currently, our HA design ensures "write fencing" by having the failover controller call a fencing script before transitioning a new node to active. However, if the fencing script is based on...
http://issues.apache.org/jira/browse/HDFS-3962    Author: Todd Lipcon, 2013-05-03, 16:40
[HDFS-4485] HDFS-347: DN should chmod socket path a+w - HDFS - [issue]
...In cluster-testing HDFS-347, we found that in clusters where the MR job doesn't run as the same user as HDFS, clients wouldn't use short circuit read because of a 'permission denied' error c...
http://issues.apache.org/jira/browse/HDFS-4485    Author: Todd Lipcon, 2013-05-02, 07:44
[HDFS-2579] Starting delegation token manager during safemode fails - HDFS - [issue]
...I noticed this on the HA branch, but it seems to actually affect non-HA branch 0.23 if security is enabled. When the NN starts up, if security is enabled, we start the delegation token secre...
http://issues.apache.org/jira/browse/HDFS-2579    Author: Todd Lipcon, 2013-04-12, 14:58
[HDFS-1013] Miscellaneous improvements to HTML markup for web UIs - HDFS - [issue]
...The Web UIs have various bits of bad markup (eg missing <head> sections, some pages missing CSS links, inconsistent td vs th for table headings). We should fix this up....
http://issues.apache.org/jira/browse/HDFS-1013    Author: Todd Lipcon, 2013-04-11, 01:21
[HDFS-4643] Fix flakiness in TestQuorumJournalManager - HDFS - [issue]
...TestQuorumJournalManager can occasionally fail if two consecutive test cases pick the same port number for the JournalNodes. In this case, sometimes an IPC client can be cached from a previo...
http://issues.apache.org/jira/browse/HDFS-4643    Author: Todd Lipcon, 2013-04-10, 15:06
[HDFS-496] Use PureJavaCrc32 in HDFS - HDFS - [issue]
...Common now has a pure java CRC32 implementation which is more efficient than java.util.zip.CRC32. This issue is to make use of it....
http://issues.apache.org/jira/browse/HDFS-496    Author: Todd Lipcon, 2013-04-03, 00:59
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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