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[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-12647] DN commands processing should be async
...Due to dataset lock contention, service actors may encounter significant latency while processing DN commands. Even the queuing of async deletions require multiple lock acquisiti...
, 2017-11-16, 14:44
[HDFS-5453] Support fine grain locking in FSNamesystem
...The namesystem currently uses a course grain lock to control access. This prevents concurrent writers in different branches of the tree, and prevents readers from accessing branches th...
, 2017-11-15, 16:14
[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-12747] Lease monitor may infinitely loop on the same lease
...Lease recovery incorrectly handles UC files if the last block is complete but the penultimate block is committed. Incorrectly handles is the euphemism for infinitely loops for days and...
, 2017-10-31, 14:15
[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...
, 2017-10-27, 22:43
[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-12703] Exceptions are fatal to decommissioning monitor
...The DecommissionManager.Monitor runs as an executor scheduled task. If an exception occurs, all decommissioning ceases until the NN is restarted. Per javadoc for executor#schedul...
, 2017-10-24, 16:49
[HDFS-12704] FBR may corrupt block state
...If FBR processing generates a runtime exception it is believed to foul the block state and lead to unpredictable behavior....
, 2017-10-24, 16:49
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