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[HDFS-4298] StorageRetentionManager spews warnings when used with QJM - HDFS - [issue]
...When the NN is configured with a QJM, we see the following warning message every time a checkpoint is made or uploaded:12/12/10 16:07:52 WARN namenode.FSEditLog: Unable to determine input st...
http://issues.apache.org/jira/browse/HDFS-4298    Author: Todd Lipcon, 2013-05-25, 16:11
[HDFS-4833] Corrupt blocks are not invalidated when first processing repl queues - HDFS - [issue]
...When the NN processes misreplicated blocks in processMisReplicatedBlock (eg during initial startup when first processing repl queues), it does not invalidate corrupt replicas unless the bloc...
http://issues.apache.org/jira/browse/HDFS-4833    Author: Todd Lipcon, 2013-05-16, 22:05
[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
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
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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