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[HDFS-5223] Allow edit log/fsimage format changes without changing layout version - HDFS - [issue]
...Currently all HDFS on-disk formats are version by the single layout version. This means that even for changes which might be backward compatible, like the addition of a new edit log op code,...
http://issues.apache.org/jira/browse/HDFS-5223    Author: Aaron T. Myers, 2014-01-15, 23:14
[HDFS-4376]  Fix several race conditions in Balancer and resolve intermittent timeout of TestBalancerWithNodeGroup - HDFS - [issue]
...HDFS-4261 fixed several issues with the balancer and balancer tests, and reduced the frequency with which TestBalancerWithNodeGroup times out. Despite this, occasional timeouts still occur i...
http://issues.apache.org/jira/browse/HDFS-4376    Author: Aaron T. Myers, 2013-11-28, 14:43
[HDFS-5517] Lower the default maximum number of blocks per file - HDFS - [issue]
...We introduced the maximum number of blocks per file in HDFS-4305, but we set the default to 1MM. In practice this limit is so high as to never be hit, whereas we know that an individual file...
http://issues.apache.org/jira/browse/HDFS-5517    Author: Aaron T. Myers, 2013-11-17, 14:11
[HDFS-5027] On startup, DN should scan volumes in parallel - HDFS - [issue]
...On startup the DN must scan all replicas on all configured volumes before the initial block report to the NN. This is currently done serially, but can be done in parallel to improve startup ...
http://issues.apache.org/jira/browse/HDFS-5027    Author: Aaron T. Myers, 2013-11-11, 21:29
[HDFS-5403] WebHdfs client cannot communicate with older WebHdfs servers post HDFS-5306 - HDFS - [issue]
...HDFS-5306 introduced the field infoSecurePort to the DatanodeIDProto PB definition and made it optional for compatibility purposes. However, we don't correctly the handle the case when this ...
http://issues.apache.org/jira/browse/HDFS-5403    Author: Aaron T. Myers, 2013-11-01, 21:59
[HDFS-5433] When reloading fsimage during checkpointing, we should clear existing snapshottable directories - HDFS - [issue]
...The complete set of snapshottable directories are referenced both via the file system tree and in the SnapshotManager class. It's possible that when the 2NN performs a checkpoint, it will re...
http://issues.apache.org/jira/browse/HDFS-5433    Author: Aaron T. Myers, 2013-10-31, 15:20
[HDFS-4657] Limit the number of blocks logged by the NN after a block report to a configurable value. - HDFS - [issue]
...If incremental BR is received before first full BR NN will log a line for every block on a DN.This can impact restart times pretty substantially if the DNs have a lot of blocks, and since th...
http://issues.apache.org/jira/browse/HDFS-4657    Author: Aaron T. Myers, 2013-10-30, 13:03
[HDFS-5408] Optional fields in PB definitions should be optional in HTTP deserialization as well - HDFS - [issue]
...As was pointed out by Andrew Wang in HDFS-5403, there are a few fields which are marked as optional in PB definitions but then assumed to always exist in the JSON deserialization of the WebH...
http://issues.apache.org/jira/browse/HDFS-5408    Author: Aaron T. Myers, 2013-10-25, 02:57
[HDFS-5289] Race condition in TestRetryCacheWithHA#testCreateSymlink causes spurious test failure - HDFS - [issue]
...The code to check if the operation has been completed on the active NN can potentially execute before the thread actually doing the operation has run. In this case the checking code will ret...
http://issues.apache.org/jira/browse/HDFS-5289    Author: Aaron T. Myers, 2013-10-03, 15:00
[HDFS-3133] Add support for DFS upgrade with HA enabled - HDFS - [issue]
...For the first implementation of HA NameNode, we punted on allowing DFS upgrade with HA enabled, which makes doing a DFS upgrade on an HA-enabled cluster quite cumbersome and error-prone. We ...
http://issues.apache.org/jira/browse/HDFS-3133    Author: Aaron T. Myers, 2013-10-02, 23:14
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