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[HDFS-12657] Operations based on inode id must not fallback to the path
...HDFS-6294 added the ability for some path-based operations to specify an optional inode id to mimic file descriptors. If an inode id is provided and it exists, it replaces the provided...
, 2017-10-23, 23:56
[HDFS-12658] Lease renewal causes connection flapping
...Adding a dfsclient to the lease renewer use the minimum of 1/2 the soft timeout vs. 1/2 the client's timeout (when the client closes an idle connection). Both default to 1m, so clients...
, 2017-10-13, 16:28
[HDFS-12639] BPOfferService lock may stall all service actors
...BPOfferService manages BPServiceActor instances for the active and standby. It uses a RW lock to primarily protect registration information while determining the active/standby from he...
, 2017-10-12, 23:03
[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...
, 2017-10-12, 19:20
[HDFS-12645] FSDatasetImpl lock will stall BP service actors and may cause missing blocks
...The DN is extremely susceptible to a slow volume due bad locking practices. DN operations require a fs dataset lock. IO in the dataset lock should not be permissible as it leads ...
, 2017-10-12, 14:56
[HDFS-12646] Avoid IO while holding the FsDataset lock
...IO operations should be allowed while holding the dataset lock. Notable offenders include but are not limited to the instantiation of a block sender/receiver, constructing the path to ...
, 2017-10-12, 14:26
[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...
, 2017-10-09, 23:01
[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...
, 2017-10-09, 21:18
[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. ...
, 2017-10-05, 21:58
[HDFS-5823] Document async audit logging
...HDFS-5241 added an option for async log4j audit logging. The option is considered semi-experimental and should be documented in hdfs-defaults.xml after it's stability under stress is p...
, 2017-10-04, 21:09
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