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[HDFS-12140] Remove BPOfferService lock contention to get block pool id
...The block pool id is protected by a lock in BPOfferService. This creates excessive contention especially for xceivers threads attempting to queue IBRs and heartbeat processing. W...
, 2017-07-25, 04:42
[HDFS-12184] Avoid redundant ancestor metadata traversals for listStatus child entries.
...Creating a file status requires metadata for EC, EZ, storage policies, etc that are computed by traversing up the ancestor inodes. List status will incur the same penalties for all chi...
, 2017-07-21, 18:08
[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
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