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[HDFS-7597] DNs should not open new NN connections when webhdfs clients seek
...Webhdfs seeks involve closing the current connection, and reissuing a new open request with the new offset. The RPC layer caches connections so the DN keeps a lingering connection open...
, 2015-08-05, 22:20
[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-5242] Reduce contention on DatanodeInfo instances
...Synchronization in DatanodeInfo instances causes unnecessary contention between call handlers....
, 2015-05-18, 20:50
[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-7005] DFS input streams do not timeout
...Input streams lost their timeout. The problem appears to be DFSClient#newConnectedPeer does not set the read timeout. During a temporary network interruption the server will clos...
, 2015-04-25, 01:10
[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
[HDFS-5241] Provide alternate queuing audit logger to reduce logging contention
...The default audit logger has extremely poor performance. The internal synchronization of log4j causes massive contention between the call handlers (100 by default) which drastically li...
, 2015-04-06, 18:15
[HDFS-7990] IBR delete ack should not be delayed
...HDFS-395 added the incremental BR feature. A concern was avoiding a race condition with ack-ing block invalidates followed by the directory scanner re-adding the block before the async...
, 2015-03-28, 14:42
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