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[HDFS-10955] Pass IIP for FSDirAttr methods
...Methods should always use the resolved IIP instead of re-solving the path....
, 2016-10-06, 22:00
[HDFS-10745] Directly resolve paths into INodesInPath
...The intermediate resolution to a string, only to be decomposed by INodesInPath back into a byte can be eliminated by resolving directly to an IIP. The IIP will contain the resolved...
, 2016-10-06, 17:03
[HDFS-10956] Remove rename/delete performance penalty when not using snapshots
...When deleting or renaming directories, the entire subtree(s) is scanned for snapshottable directories. The performance penalty may become very expensive for dense trees. The snap...
, 2016-10-04, 20:30
[HDFS-10940] Reduce performance penalty of block caching when not used
...For every block location generated, the CacheManager will create a junk object for a hash lookup of cached locations. If there are no cached blocks, none of this is required....
, 2016-10-03, 17:01
[HDFS-10619] Cache path in InodesInPath
...INodesInPath#getPath, a frequently called method, dynamically builds the path. IIP should cache the path upon construction....
, 2016-10-03, 14:43
[HDFS-10851] FSDirStatAndListingOp: stop passing path as string
...Path strings should be resolved once into INodesInPath. The IIP should be used extensively from that point forward. ...
, 2016-10-03, 14:10
[HDFS-5239] Allow FSNamesystem lock fairness to be configurable
...The fairness of the FSNamesystem#fsLock is hardcoded to true. Using an unfair lock provides a negligible increase to throughput. However this is due to bottlenecks elsewhere in t...
, 2016-09-30, 16:57
[HDFS-10850] getEZForPath should NOT throw FNF
...HDFS-9433 made an incompatible change to the semantics of getEZForPath. It used to return the EZ of the closest ancestor path. It never threw FNF. A common use of getEZForP...
, 2016-09-30, 14:21
[HDFS-10779] Rename does not need to re-solve destination
...Rename uses FSDirectory.isDir(String) to determine if the destination is a directory. This dissect the path, creates an IIP, checks if the last inode is a directory. The rename o...
, 2016-09-28, 23:17
[HDFS-10662] Optimize UTF8 string/byte conversions
...String/byte conversions may take either a Charset instance or its canonical name. One might think a Charset instance would be faster due to avoiding a lookup and instantiation of a Cha...
, 2016-09-20, 08:33
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