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[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-3519] Checkpoint upload may interfere with a concurrent saveNamespace - HDFS - [issue]
...TestStandbyCheckpoints failed in precommit build 2620 due to the following issue: both nodes were in Standby state, and configured to checkpoint "as fast as possible" NN1 starts to save its ...
http://issues.apache.org/jira/browse/HDFS-3519    Author: Todd Lipcon, 2013-05-09, 23:44
[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
Re: DistributedFileSystem.listStatus() - Why does it do partial listings then assemble? - HDFS - [mail # dev]
...Hi Brad,  The reasoning is that the NameNode locking is somewhat coarse grained. In older versions of Hadoop, before it worked this way, we found that listing large directories (eg with...
   Author: Todd Lipcon, 2013-05-02, 16:28
[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
Re: Heads up - Snapshots feature merge into trunk - HDFS - [mail # dev]
...On Fri, Apr 19, 2013 at 3:36 AM, Aaron T. Myers  wrote:  Agreed. The cases of WAFL/ZFS were brought up -- in those file systems, even if users may take snapshots, they're done usin...
   Author: Todd Lipcon, 2013-04-24, 20:25
[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
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