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Re: dfs.datanode.socket.reuse.keepalive - HDFS - [mail # dev]
...+1 for dropping the client side expiry down to something like 1-2 seconds. I'd rather do that than up the server side, since the server side resource (DN threads) is likely to be more conten...
   Author: Todd Lipcon, 2013-06-10, 17:35
[HDFS-3447] StandbyException should not be logged at ERROR level on server - HDFS - [issue]
...Currently, the standby NN will log StandbyExceptions at ERROR level any time a client tries to connect to it. So, if the second NN in an HA pair is active, the first NN will spew a lot of th...
http://issues.apache.org/jira/browse/HDFS-3447    Author: Todd Lipcon, 2013-06-07, 08:31
[HDFS-3974] dfsadmin -metasave throws NPE when under-replicated blocks are recently deleted - HDFS - [issue]
...We currently have the following race: Block is underreplicated, hence it's present in neededReplications User deletes the block - its BlockInfo.blockCollection is set to null Admin runs meta...
http://issues.apache.org/jira/browse/HDFS-3974    Author: Todd Lipcon, 2013-06-04, 19:23
[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-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
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