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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-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
[HDFS-6967] DNs may OOM under high webhdfs load
...Webhdfs uses jetty. The size of the request thread pool is limited, but jetty will accept and queue infinite connections. Every queued connection is "heavy" with buffers, etc. &n...
, 2015-02-23, 16:36
[HDFS-2473] Fetching tokens from insecure cluster throws NPEs
...Retrieving tokens from an insecure cluster throws an NPE. This prevents copies from insecure to secure clusters. The problem is in DFSClient.getDelegationToken(). It attemp...
, 2015-02-05, 17:18
[HDFS-6948] DN rejects blocks if it has older UC block
...DNs appear to always reject blocks, even with newer genstamps, if it already has a UC copy in its tmp dir.ReplicaAlreadyExistsException: BlockXXX alreadyexists in state TEMPORARY and thus ca...
, 2014-09-06, 01:32
[HDFS-4232] NN fails to write a fsimage with stale leases
...The reading of a fsimage will ignore leases for non-existent files, but the writing of an image will fail if there are leases for non-existent files. If the image contains leases that ...
, 2014-09-04, 00:24
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