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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...
, 2016-08-18, 01:15
[HDFS-8402] Fsck exit codes are not reliable
...HDFS-6663 added the ability to check specific blocks. The exit code is non-deterministically based on the state (corrupt, healthy, etc) of the last displayed block's last storage locat...
, 2016-08-17, 20:28
[HDFS-10743] MiniDFSCluster test runtimes can be drastically reduce
...MiniDFSCluster tests have excessive runtimes. The main problem appears to be the heartbeat interval. The NN may have to wait up to 3s (default value) for all DNs to heartbeat, tr...
, 2016-08-16, 17:43
[HDFS-10342] BlockManager#createLocatedBlocks should not check corrupt replicas if none are corrupt
...corruptReplicas#isReplicaCorrupt(block, node) is called for every node while populating the machines array. There's no need to invoke the method if corruptReplicas#numCorruptReplicas(b...
, 2016-08-16, 14:41
[HDFS-10343] BlockManager#createLocatedBlocks may return blocks on failed storages
...Storage state is ignored when building the machines list. Failed storage removal is not immediate so clients may be directed to bad locations. The client recovers but it's less t...
, 2016-08-04, 20:40
[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. ...
, 2016-08-04, 13:35
[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...
, 2016-08-03, 14:14
[HDFS-7597] DelegationTokenIdentifier should cache the TokenIdentifier to UGI mapping
...Webhdfs seeks involve closing the current connection, and reissuing a new open request with the new offset. The RPC layer caches connections so the DN keeps a lingering connection open...
, 2016-07-28, 18:30
[HDFS-9198] Coalesce IBR processing in the NN
...IBRs from thousands of DNs under load will degrade NN performance due to excessive write-lock contention from multiple IPC handler threads. The IBR processing is quick, so the lock con...
, 2016-07-27, 22:10
[HDFS-10653] Optimize conversion from path string to components
...Converting a path String to a byte currently requires an unnecessary intermediate conversion from String to String. Removing this will reduce excessive object allocation and byte...
, 2016-07-22, 17:07
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