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[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
[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
[HDFS-7967] Reduce the performance impact of the balancer
...The balancer needs to query for blocks to move from overly full DNs. The block lookup is extremely inefficient. An iterator of the node's blocks is created from the iterators of ...
, 2015-03-25, 22:19
[HDFS-6964] NN fails to fix under replication leading to data loss
...We've encountered lost blocks due to node failure even when there is ample time to fix the under-replication.2 nodes were lost. The 3rd node with the last remaining replicas averaged 1...
, 2015-03-11, 20:09
[HDFS-5823] Document async audit logging
...HDFS-5241 added an option for async log4j audit logging. The option is considered semi-experimental and should be documented in hdfs-defaults.xml after it's stability under stress is p...
, 2015-03-11, 18:23
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