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[HDFS-6401] WebHdfs should always use the network failover policy
...Webhdfs only uses the network failover policy if HA is enabled. The policy adds retries for exceptions such as connect failures which are always useful. The proxy also provides s...
, 2016-06-05, 05:58
[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-10326] Disable setting tcp socket send/receive buffers for write pipelines
...The DataStreamer and the Datanode use a hardcoded DEFAULT_DATA_SOCKET_SIZE=128K for the send and receive buffers of a write pipeline. Explicitly setting tcp buffer sizes disables tcp s...
, 2016-04-26, 23:28
[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-8498] Blocks can be committed with wrong size
...When an IBR for a UC block arrives, the NN updates the expected location's block and replica state only if it's on an unexpected storage for an expected DN. If it's for an expected sto...
, 2016-03-31, 13:50
[HDFS-5242] Reduce contention on DatanodeInfo instances
...Synchronization in DatanodeInfo instances causes unnecessary contention between call handlers....
, 2016-03-29, 07:58
[HDFS-7964] Add support for async edit logging
...Edit logging is a major source of contention within the NN. LogEdit is called within the namespace write log, while logSync is called outside of the lock to allow greater concurrency. ...
, 2016-03-01, 00:03
[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
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