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Colin Patrick McCabe
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[HDFS-8492] DN should notify NN when client requests a missing block
...If the DN has a block its volume map but not on-disk, it tells clients it's an invalid block id. The NN is not informed of the missing block until either the bp slice scanner or the di...
, 2015-10-12, 10:57
[HDFS-9107] Prevent NN's unrecoverable death spiral after full GC
...A full GC pause in the NN that exceeds the dead node interval can lead to an infinite cycle of full GCs. The most common situation that precipitates an unrecoverable state is a network...
, 2015-09-26, 04:43
[HDFS-9017] UI shows wrong last contact for dead nodes
...It's showing the last contact as the restart of the NN host (not process, host). Presumably it's using monotonic time 0. Ideally last contact for nodes that never connected would...
, 2015-09-12, 08:50
[HDFS-7213] processIncrementalBlockReport performance degradation
...BlockManager#processIncrementalBlockReport has a debug line that is missing a isDebugEnabled check. The write lock is being held. Coupled with the increase in incremental block r...
, 2015-08-30, 19:50
[HDFS-8776] Decom manager should not be active on standby
...The decommission manager should not be actively processing on the standby.The decomm manager goes through the costly computation for determining every block on the node requires replication ...
, 2015-08-18, 23:14
[HDFS-8616] Cherry pick HDFS-6945 for excess block leak
...Busy clusters quickly leak tens or hundreds of thousands of excess blocks which slow BR processing. HDFS-6495 should be cherry picked into 2.7.x....
, 2015-07-21, 04:18
[HDFS-4564] Webhdfs returns incorrect http response codes for denied operations
...Webhdfs is returning 401 (Unauthorized) instead of 403 (Forbidden) when it's denying operations. Examples including rejecting invalid proxy user attempts and renew/cancel with an inval...
, 2015-06-02, 01:54
[HDFS-8491] DN shutdown race conditions with open xceivers
...DN shutdowns at least for restarts have many race conditions. Shutdown is very noisy with exceptions. The DN notifies writers of the restart, waits 1s and then interrupts the xce...
, 2015-05-28, 17:17
[HDFS-7433] Optimize performance of DatanodeManager's node map
...The datanode map is currently a TreeMap. For many thousands of datanodes, tree lookups are ~10X more expensive than a HashMap. Insertions and removals are up to 100X more expensi...
, 2015-05-09, 16:30
[HDFS-8133] Improve readability of deleted block check
...The current means of checking if a block is deleted is checking if its block collection is null. A more readable approach is an isDeleted method....
, 2015-04-22, 14:41
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