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[HDFS-5060] NN should proactively perform a saveNamespace if it has a huge number of outstanding uncheckpointed transactions - HDFS - [issue]
...In a properly-functioning HDFS system, checkpoints will be triggered either by the secondary NN or standby NN regularly, by default every hour or 1MM outstanding edits transactions, whicheve...
http://issues.apache.org/jira/browse/HDFS-5060    Author: Aaron T. Myers, 2013-08-05, 18:35
Re: Question for edit log retain - HDFS - [mail # dev]
...Hi Azuryy,  On Wed, Jun 26, 2013 at 6:12 PM, Azuryy Yu  wrote:   Here, "checkpoint" is referring to the fsimage files on the NN.    This is the number of old fsimage...
   Author: Aaron T. Myers, 2013-07-01, 23:02
[HDFS-4830] Typo in config settings for AvailableSpaceVolumeChoosingPolicy in hdfs-default.xml - HDFS - [issue]
...In hdfs-default.xml we have these two settings:dfs.datanode.fsdataset.volume.choosing.balanced-space-thresholddfs.datanode.fsdataset.volume.choosing.balanced-space-preference-percentBut in f...
http://issues.apache.org/jira/browse/HDFS-4830    Author: Aaron T. Myers, 2013-05-25, 16:10
[HDFS-2393] Mark appropriate methods of ClientProtocol with the idempotent annotation - HDFS - [issue]
...HDFS-1973 will make the DFSClient take advantage of the annotation. This JIRA is to identify which methods can be marked as idempotent....
http://issues.apache.org/jira/browse/HDFS-2393    Author: Aaron T. Myers, 2013-05-25, 00:04
Re: [VOTE] Merge HDFS-2802 snapshot feature to trunk - HDFS - [mail # dev]
...I'm +1 as well on merging this branch to trunk. I've thoroughly reviewed/discussed the design and have personally reviewed much of the code as well. Good stuff.  I would have preferred ...
   Author: Aaron T. Myers, 2013-05-08, 00:29
[HDFS-4739] NN can miscalculate the number of extra edit log segments to retain - HDFS - [issue]
...The code in NNStorageRetentionManager#purgeOldStorage is intended to place a cap on the number of extra edit log segments retained beyond what is strictly required to replay the FS history s...
http://issues.apache.org/jira/browse/HDFS-4739    Author: Aaron T. Myers, 2013-04-25, 15:07
Re: Cannot communicate - HDFS - [mail # dev]
...Hi Kevin,  Since it seems like this is a CDH-specific question, I recommend you email [EMAIL PROTECTED] where you should be able to get some help with this.   Aaron T. Myers Softwa...
   Author: Aaron T. Myers, 2013-04-24, 02:19
[expand - 1 more] - Re: Convention question for using DFSConfigKey constants : are zeros magic? - HDFS - [mail # dev]
...On Fri, Apr 19, 2013 at 3:40 PM, Jay Vyas  wrote:   There's certainly no "enforcement" of it, no. We try to use consistent prefixes, append units like "millis" or "seconds" to conf...
   Author: Aaron T. Myers, 2013-04-24, 02:15
[expand - 2 more] - Re: Heads up - Snapshots feature merge into trunk - HDFS - [mail # dev]
...On Fri, Apr 19, 2013 at 6:53 AM, Tsz Wo Sze  wrote:   I agree that they're not administrative operations in the sense that they don't strictly require super user privilege, but the...
   Author: Aaron T. Myers, 2013-04-18, 22:06
[expand - 3 more] - Re: VOTE: HDFS-347 merge - HDFS - [mail # dev]
...Since the merge vote passed, I have merged the HDFS-347 branch to trunk. Leaving the JIRA open for now until we also do the merge to branch-2.  Colin, thanks a ton for the monster contr...
   Author: Aaron T. Myers, 2013-04-13, 02:16
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