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[HDFS-5293] Symlink resolution requires unnecessary RPCs
...When the NN encounters a symlink, it throws an UnresolvedLinkException. This exception contains only the path that is a symlink. The client issues another RPC to obtain the link ...
, 2016-06-05, 05:58
[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-8674] Improve performance of postponed block scans
...When a standby goes active, it marks all nodes as "stale" which will cause block invalidations for over-replicated blocks to be queued until full block reports are received from the nodes wi...
, 2016-04-10, 16:22
[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
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