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[HDFS-6964] NN fails to fix under replication leading to data loss
...We've encountered lost blocks due to node failure even when there is ample time to fix the under-replication.2 nodes were lost. The 3rd node with the last remaining replicas averaged 1...
, 2017-08-24, 14:04
[HDFS-7967] Reduce the performance impact of the balancer
...The balancer needs to query for blocks to move from overly full DNs. The block lookup is extremely inefficient. An iterator of the node's blocks is created from the iterators of ...
, 2017-08-24, 01:20
[HDFS-12172] Reduce EZ lookup overhead
...A number of inefficiencies exist in EZ lookups. These are amplified by frequent operations like list status. Once one encryption zone exists, all operations take the performance ...
, 2017-08-07, 03:11
[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-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
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