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[HDFS-5477] Block manager as a service
...The block manager needs to evolve towards having the ability to run as a standalone service to improve NN vertical and horizontal scalability. The goal is reducing the memory footprint...
, 2016-05-17, 20:24
[HDFS-5453] Support fine grain locking in FSNamesystem
...The namesystem currently uses a course grain lock to control access. This prevents concurrent writers in different branches of the tree, and prevents readers from accessing branches th...
, 2016-04-18, 05:04
[HDFS-5242] Reduce contention on DatanodeInfo instances
...Synchronization in DatanodeInfo instances causes unnecessary contention between call handlers....
, 2016-03-29, 07:58
[HDFS-9258] NN should indicate which nodes are stale
...Determining why the NN is not coming out of safemode is difficult - is it a bug or pending block reports? If the number of nodes appears sufficient, but there are missing blocks, it wo...
, 2016-02-23, 14:58
[HDFS-7457] DatanodeID generates excessive garbage
...DatanodeID#getXferAddr is a dynamically generated string. This string is repeatedly generated for the hash code, equality, comparisons, and stringification. Every DN->NN RPC m...
, 2016-02-11, 23:20
[HDFS-8486] DN startup may cause severe data loss
...A race condition between block pool initialization and the directory scanner may cause a mass deletion of blocks in multiple storages.If block pool initialization finds a block on disk that ...
, 2016-02-11, 23:17
[HDFS-4478] Token operations should not lock namespace
...Token get/renew/cancel operations obtain a write lock on the namespace. This seems unnecessary....
, 2016-01-22, 03:30
[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-9107] Prevent NN's unrecoverable death spiral after full GC
...A full GC pause in the NN that exceeds the dead node interval can lead to an infinite cycle of full GCs. The most common situation that precipitates an unrecoverable state is a network...
, 2015-09-26, 04:43
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