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[HDFS-1139] Forward-port TestFileAppend4 tests from 20-append branch - HDFS - [issue]
...In working on the append fixes for branch 20 we've added a number of test, several of which expose bugs in the trunk append as well. This issue is to forward port all of the tests - it's eas...
http://issues.apache.org/jira/browse/HDFS-1139    Author: Todd Lipcon, 2014-07-30, 20:29
[HDFS-1060] Append/flush should support concurrent "tailer" use case - HDFS - [issue]
...Several people have a usecase for a writer logging edits and using hflush() while one or more readers "tails" the file by periodically reopening and seeking to get the latest bytes. Currentl...
http://issues.apache.org/jira/browse/HDFS-1060    Author: Todd Lipcon, 2014-07-30, 17:58
[HDFS-1059] completeFile loops forever if the block's only replica has become corrupt - HDFS - [issue]
...If a writer is appending to a block with replication factor 1, and that block has become corrupt, a reader will report the corruption to the NN. Then when the writer tries to complete the fi...
http://issues.apache.org/jira/browse/HDFS-1059    Author: Todd Lipcon, 2014-07-30, 17:57
[HDFS-1056] Multi-node RPC deadlocks during block recovery - HDFS - [issue]
...Believe it or not, I'm seeing HADOOP-3657 / HADOOP-3673 in a 5-node 0.20 cluster. I have many concurrent writes on the cluster, and when I kill a DN, some percentage of the time I get one of...
http://issues.apache.org/jira/browse/HDFS-1056    Author: Todd Lipcon, 2014-07-30, 17:42
[HDFS-788] Datanode behaves badly when one disk is very low on space - HDFS - [issue]
...FSDataset.getNextVolume() uses FSVolume.getAvailable() to determine whether to allocate a block on a volume. This doesn't factor in other in-flight blocks that have been "promised" space on ...
http://issues.apache.org/jira/browse/HDFS-788    Author: Todd Lipcon, 2014-07-30, 01:00
[HDFS-864] Potential deadlock rolling edit logs - HDFS - [issue]
...FSEditLog.rollEditLog locks the log, then the FSImage. FSImage.close locks the image, then the log....
http://issues.apache.org/jira/browse/HDFS-864    Author: Todd Lipcon, 2014-07-29, 22:41
[HDFS-862] Potential NN deadlock in processDistributedUpgradeCommand - HDFS - [issue]
...Haven't seen this in practice, but the lock order is inconsistent. processReport locks FSNamesystem, then calls UpgradeManager.startUpgrade, getUpgradeState, and getUpgradeStatus (each of wh...
http://issues.apache.org/jira/browse/HDFS-862    Author: Todd Lipcon, 2014-07-29, 22:41
[HDFS-842] Serialize NN edits log as avro records - HDFS - [issue]
...Right now, the edits log is a mishmash of ad-hoc serialization and Writables. Switching it over to Avro records would be really useful for operator tools - an "offline edits viewer" would be...
http://issues.apache.org/jira/browse/HDFS-842    Author: Todd Lipcon, 2014-07-29, 22:17
[HDFS-460] Expose NN and DN hooks to service plugins - HDFS - [issue]
...This is the other half of the old HADOOP-5640 (Allow ServicePlugins to hook callbacks into key service events). It adds hooks to the NN and DN to expose certain events to plugins....
http://issues.apache.org/jira/browse/HDFS-460    Author: Todd Lipcon, 2014-07-23, 19:39
[HDFS-4324] Track and report out-of-date blocks separately from corrupt blocks - HDFS - [issue]
...Currently in various places (metrics, dfsadmin -report, fsck, logs) we use the term "corrupt" to refer to blocks which have an out-of-date generation stamp. Since out-of-date blocks are a fa...
http://issues.apache.org/jira/browse/HDFS-4324    Author: Todd Lipcon, 2014-07-10, 17:18
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