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[HDFS-12648] DN should provide feedback to NN for throttling commands
...The NN should avoid sending commands to a DN with a high number of outstanding commands. The heartbeat could provide this feedback via perhaps a simple count of the commands or rate of...
, 2017-12-05, 22:56
[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 ...
, 2017-11-20, 20:48
[HDFS-10674] Optimize creating a full path from an inode
...INode#getFullPathName walks up the inode tree, creates a INode, converts each component byte name to a String while building the path. This involves many allocations, copies, and c...
, 2017-11-17, 11:52
[HDFS-12705] WebHdfsFileSystem exceptions should retain the caused by exception
...WebHdfsFileSystem#runWithRetry uses reflection to prepend the remote host to the exception. While it preserves the original stacktrace, it omits the original cause which complicates de...
, 2017-11-13, 22:20
[HDFS-4493] webhdfs fails after SPNEGO token expires
...Webhdfs assumes that SPNEGO's AuthenticationException is always fatal. The exception is thrown if authentication truly fails due to bad credentials, but it's also thrown when the auth ...
, 2017-10-25, 16:56
[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-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-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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