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[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
Re: VOTE: HDFS-347 merge - HDFS - [mail # dev]
...+1 for the branch merge. I've reviewed all of the code in the branch, and we have people now running this code in production scenarios. It is as functional as the old version and way easier ...
   Author: Todd Lipcon, 2013-04-08, 20:19
[HDFS-3918] EditLogTailer shouldn't log WARN when other node is in standby mode - HDFS - [issue]
...If both nodes are in standby mode, each will be trying to roll the others' logs, which results in errors like:Unable to trigger a roll of the active NN org.apache.hadoop.ipc.StandbyException...
http://issues.apache.org/jira/browse/HDFS-3918    Author: Todd Lipcon, 2013-04-06, 04:04
[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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