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[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...
, 2017-08-31, 23:03
[HDFS-11641] Reduce cost of audit logging by using FileStatus instead of HdfsFileStatus
...Audit logging operations create a HdfsFileStatus but audit logging promptly converts it to a FileStatus to pass to the loggers. A HdfsFileStatus is more expensive to create, ex. multip...
, 2017-08-31, 06:33
[HDFS-9107] Prevent NN's unrecoverable death spiral after full GC
...A full GC pause in the NN that exceeds the dead node interval can lead to an infinite cycle of full GCs. The most common situation that precipitates an unrecoverable state is a network...
, 2017-08-30, 23:17
[HDFS-12136] BlockSender performance regression due to volume scanner edge case
...HDFS-11160 attempted to fix a volume scan race for a file appended mid-scan by reading the last checksum of finalized blocks within the BlockSender ctor. Unfortunately it's holding the...
, 2017-08-29, 15:00
[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-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
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