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[HDFS-12174] DN commitBlockSynchronization needs delivery guarantee
...The DN's attempt to send a successful commit block synchronization to the NN is fire and forget. There are no retries. The file will linger open until the hard lease timeout. &nb...
, 2017-07-20, 21:34
[HDFS-11310] Reduce the performance impact of the balancer (trunk port)
...HDFS-7967 introduced a highly performant balancer getBlocks() query that scales to large/dense clusters. The simple design implementation depends on the triplets data structure. ...
, 2017-06-30, 00:49
[HDFS-5239] Allow FSNamesystem lock fairness to be configurable
...The fairness of the FSNamesystem#fsLock is hardcoded to true. Using an unfair lock provides a negligible increase to throughput. However this is due to bottlenecks elsewhere in t...
, 2017-06-15, 05:27
[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...
, 2017-06-07, 22:59
[HDFS-11648] Lazy construct the IIP pathname
...The IIP pathname is a string constructed from the byte components. If the pathname will never be accessed, ex. processing listStatus children, building the path is unnecessarily ex...
, 2017-06-07, 22:59
[HDFS-10619] Cache path in InodesInPath
...INodesInPath#getPath, a frequently called method, dynamically builds the path. IIP should cache the path upon construction....
, 2017-05-31, 18:46
[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...
, 2017-05-27, 02:05
[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...
, 2017-05-18, 07:39
[HDFS-8492] DN should notify NN when client requests a missing block
...If the DN has a block its volume map but not on-disk, it tells clients it's an invalid block id. The NN is not informed of the missing block until either the bp slice scanner or the di...
, 2017-04-27, 14:05
[HDFS-4389] Non-HA DFSClients do not attempt reconnects
...The HA retry policy implementation appears to have broken non-HA DFSClient connect retries. The ipc Client.Connection#handleConnectionFailure used to perform 45 connection attempts, bu...
, 2017-03-31, 05:48
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