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[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
[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
[HDFS-2336] hftp only supports remote hdfs servers
...The new token renewal implementation appears to introduce invalid assumptions regarding token kinds.Any token acquired over http is assumed to be hftp, so the kind is unconditionally changed...
, 2015-03-10, 01:43
[HDFS-7434] DatanodeID hashCode should not be mutable
...Mutable hash codes may lead to orphaned instances in a collection. Instances must always be removed prior to modification of hash code values, and re-inserted. Although current c...
, 2015-03-05, 15:50
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