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[HDFS-6606] Optimize HDFS Encrypted Transport performance - HDFS - [issue]
...In HDFS-3637, Aaron T. Myers added support for encrypting the DataTransferProtocol, it was a great work.It utilizes SASL Digest-MD5 mechanism (use Qop: auth-conf),  it supports three se...
http://issues.apache.org/jira/browse/HDFS-6606    Author: Yi Liu, 2014-09-06, 00:13
[HDFS-6886] Use single editlog record for creating file + overwrite. - HDFS - [issue]
...As discussed in HDFS-6871, as Jing Zhao and Colin Patrick McCabe's suggestion, we could do further improvement to use one editlog record for creating file + overwrite in this JIRA. We could ...
http://issues.apache.org/jira/browse/HDFS-6886    Author: Yi Liu, 2014-09-05, 14:48
[HDFS-6871] Improve NameNode performance when creating file   - HDFS - [issue]
...Creating file with overwrite flag will cause NN fall into flush edit logs and block other requests if the file exists.When we create a file with overwrite flag (default is true) in HDFS, NN ...
http://issues.apache.org/jira/browse/HDFS-6871    Author: Yi Liu, 2014-09-05, 03:41
[HDFS-6367] EnumSetParam$Domain#parse fails for parameter containing more than one enum. - HDFS - [issue]
...Fails because additional "," ----------------------------------------------------------------java.lang.IllegalArgumentException: No enum const class org.apache.hadoop.fs.Options$Rename.,OVER...
http://issues.apache.org/jira/browse/HDFS-6367    Author: Yi Liu, 2014-09-03, 21:34
[HDFS-6901] Remove unnecessary CryptoCodec and KeyProvider.Options definition in FSNamesystem - HDFS - [issue]
...CryptoCodec and KeyProvider.Options are not necessary in FSN....
http://issues.apache.org/jira/browse/HDFS-6901    Author: Yi Liu, 2014-08-28, 02:50
[HDFS-6870] Blocks and INodes could leak for Rename with overwrite flag - HDFS - [issue]
...Following code in FSDirectory#unprotectedRenameTo doesn't collect blocks and INodes for non snapshot path.        if (removedDst != null) {      ...
http://issues.apache.org/jira/browse/HDFS-6870    Author: Yi Liu, 2014-08-21, 20:44
[HDFS-6885] Fix wrong use of BytesWritable in FSEditLogOp#RenameOp - HDFS - [issue]
...After readField using BytesWritable, the data length should be writable.getLength(), instead of writable.getBytes().length which is the buffer length. This will cause returned Rename[] is lo...
http://issues.apache.org/jira/browse/HDFS-6885    Author: Yi Liu, 2014-08-20, 09:46
[HDFS-6783] Fix HDFS CacheReplicationMonitor rescan logic - HDFS - [issue]
...In monitor thread, needsRescan is set to false before real scan starts, so for waitForRescanIfNeeded will return for the first condition:if (!needsRescan) {  return;}...
http://issues.apache.org/jira/browse/HDFS-6783    Author: Yi Liu, 2014-08-20, 01:01
[HDFS-6846] NetworkTopology#sortByDistance should give nodes higher priority, which cache the block. - HDFS - [issue]
...Currently there are 3 weights: local same rack off rackBut if some nodes cache the block, then it's faster if client read block from these nodes. So we should have some more weights as follo...
http://issues.apache.org/jira/browse/HDFS-6846    Author: Yi Liu, 2014-08-18, 22:15
[HDFS-6784] Avoid rescan twice in HDFS CacheReplicationMonitor for one FS Op if it calls setNeedsRescan multiple times. - HDFS - [issue]
...In HDFS CacheReplicationMonitor,  rescan is expensive. Sometimes, setNeedsRescan is called multiple times, for example, in FSNamesystem#modifyCacheDirective, there are 3 times. In monit...
http://issues.apache.org/jira/browse/HDFS-6784    Author: Yi Liu, 2014-08-14, 05:56
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