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[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[HDFS-4324] Track and report out-of-date blocks separately from corrupt blocks - HDFS - [issue]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in various places (metrics, dfsadmin -report, fsck, logs) we use the term "corrupt" to refer to blocks which have an out-of-date generation stamp. Since out-of-date blocks are a fa...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
[HDFS-3528] Use native CRC32 in DFS write path - HDFS - [issue]
...HDFS-2080 improved the CPU efficiency of the read path by using native SSE-enabled code for CRC verification. Benchmarks of the write path show that it's often CPU bound by checksums as well...
http://issues.apache.org/jira/browse/HDFS-3528    Author: Todd Lipcon, 2014-07-07, 18:01
[HDFS-3862] QJM: don't require a fencer to be configured if shared storage has built-in single-writer semantics - HDFS - [issue]
...Currently, NN HA requires that the administrator configure a fencing method to ensure that only a single NameNode may write to the shared storage at a time. Some shared edits storage impleme...
http://issues.apache.org/jira/browse/HDFS-3862    Author: Todd Lipcon, 2014-07-01, 14:23
[HDFS-2882] DN continues to start up, even if block pool fails to initialize - HDFS - [issue]
...I started a DN on a machine that was completely out of space on one of its drives. I saw the following:2012-02-02 09:56:50,499 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initiali...
http://issues.apache.org/jira/browse/HDFS-2882    Author: Todd Lipcon, 2014-06-30, 09:18
[HDFS-2949] HA: Add check to active state transition to prevent operator-induced split brain - HDFS - [issue]
...Currently, if the administrator mistakenly calls "-transitionToActive" on one NN while the other one is still active, all hell will break loose. We can add a simple check by having the NN ma...
http://issues.apache.org/jira/browse/HDFS-2949    Author: Todd Lipcon, 2014-06-08, 08:39
[HDFS-3103] HA NN should be able to handle some cases of storage dir recovery on start - HDFS - [issue]
...As a shortcut in developing HA, we elected not to deal with the case of storage directory recovery while HA is enabled. But there are many cases where we can and should handle it. For exampl...
http://issues.apache.org/jira/browse/HDFS-3103    Author: Todd Lipcon, 2014-04-23, 21:25
[HDFS-3969] Small bug fixes and improvements for disk locations API - HDFS - [issue]
...The new disk block locations API has a configurable timeout, but it's used inconsistently: the invokeAll() call to the thread pool assumes the timeout is in seconds, but the RPC timeout is s...
http://issues.apache.org/jira/browse/HDFS-3969    Author: Todd Lipcon, 2014-04-10, 14:12
[HDFS-2686] Remove DistributedUpgrade related code - HDFS - [issue]
...A distributed upgrade framework was introduced long ago in HADOOP-1286 but was only used twice throughout history, and not since 0.17, where it was considered buggy (see HADOOP-3677). This i...
http://issues.apache.org/jira/browse/HDFS-2686    Author: Todd Lipcon, 2014-04-09, 21:11
[HDFS-2688] HA: write tests for quota tracking and HA - HDFS - [issue]
...Quota is one of the areas I suspect we might have bugs in the current state HA implementation. We need to track quotas correctly on the standby so that when a failover occurs, all of the sta...
http://issues.apache.org/jira/browse/HDFS-2688    Author: Todd Lipcon, 2014-04-09, 21:11
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