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[HDFS-10711] Optimize FSPermissionChecker group membership check
...HADOOP-13442 obviates the need for multiple group related object allocations....
, 2017-09-14, 01:12
[HDFS-12142] Files may be closed before streamer is done
...We're encountering multiple cases of clients calling updateBlockForPipeline on completed blocks. Initial analysis is the client closes a file, completeFile succeeds, then it immediatel...
, 2017-09-11, 05:17
[HDFS-12070] Failed block recovery leaves files open indefinitely and at risk for data loss
...Files will remain open indefinitely if block recovery fails which creates a high risk of data loss. The replication monitor will not replicate these blocks.The NN provides the primary ...
, 2017-09-11, 05:14
[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
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