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[HDFS-6221] Webhdfs should recover from dead DNs
...We've repeatedly observed the jetty acceptor thread silently dying in the DNs. The webhdfs servlet may also "disappear" and jetty returns non-json 404s.One approach to make webhdfs mor...
, 2016-01-13, 19:17
[HDFS-9557] Reduce object allocation in PB conversion
...PB conversions use ByteString.copyFrom to populate the builder. Unfortunately this creates unique instances for empty arrays instead of returning the singleton ByteString.EMPTY....
, 2015-12-21, 18:55
[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-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-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-3312] Hftp selects wrong token service
...Hftp tries to select a token based on the non-secure port in the uri, instead of the secure-port. This breaks hftp on a secure cluster and there is no workaround....
, 2015-03-10, 04:36
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