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[HDFS-12143] Improve performance of getting and removing inode features
...Getting a feature uses an iterator which is less performant than an indexed for loop. Feature lookups are becoming more prolific so cycles count.Removing a feature requires building a ...
, 2017-08-01, 19:14
[HDFS-12173] MiniDFSCluster cannot reliably use NameNode#stop
...Sporadic test failures occur because NameNode#stop used by the mini cluster does not properly manage the HA context's state. It directly calls HAState#exitState(context) instead of HAS...
, 2017-08-01, 16:19
[HDFS-12049] Recommissioning live nodes stalls the NN
...A node refresh will recommission included nodes that are alive and in decommissioning or decommissioned state. The recommission will scan all blocks on the node, find over replicated b...
, 2017-08-01, 00:48
[HDFS-8675] IBRs from dead DNs go into infinite loop
...If the DN sends an IBR after the NN declares it dead, the NN returns an IOE of unregistered or dead. The DN catches the IOE, ignores it, and infinitely loops spamming the NN with retri...
, 2017-07-28, 00:32
[HDFS-12171] Reduce IIP object allocations for inode lookup
...IIP#getReadOnlyINodes is invoked frequently for EZ and EC lookups. It allocates unnecessary objects to make the primitive array an immutable array list. IIP already has a method ...
, 2017-07-25, 19:17
[HDFS-12137] DN dataset lock should be fair
...The dataset lock is very highly contended. The unfair nature can be especially harmful to the heartbeat handling. Under high loads, partially expose by HDFS-12136 introducing dis...
, 2017-07-25, 04:43
[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-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. ...
, 2017-07-21, 10:21
[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
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