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[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, 2014-07-31, 22:28
[HDFS-6786] Fix potential issue of cache refresh interval - HDFS - [issue]
...In CacheReplicationMonitor, following code is try to check whether needs to rescan every interval ms, if rescan takes n ms, then subtract n ms for the interval. But if the delta <=0, it b...
http://issues.apache.org/jira/browse/HDFS-6786    Author: Yi Liu, 2014-07-31, 20:00
[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, 2014-07-31, 19:48
[HDFS-6787] Remove duplicate code in FSDirectory#unprotectedConcat - HDFS - [issue]
...// update inodeMapremoveFromInodeMap(Arrays.asList(allSrcInodes));this snippet of code is duplicate, since we already have the logic above it:    for(INodeFile nodeToRemove: a...
http://issues.apache.org/jira/browse/HDFS-6787    Author: Yi Liu, 2014-07-31, 09:26
[HDFS-6782] Improve FS editlog logSync - HDFS - [issue]
...In NN, it uses a double buffer (bufCurrent, bufReady) for log sync, bufCurrent it to buffer new coming edit ops and bufReady is for flushing. This's efficient. When flush is ongoing, and buf...
http://issues.apache.org/jira/browse/HDFS-6782    Author: Yi Liu, 2014-07-30, 15:48
[HDFS-6724] Decrypt EDEK before creating CryptoInputStream/CryptoOutputStream - HDFS - [issue]
...In DFSClient, we need to decrypt EDEK before creating CryptoInputStream/CryptoOutputStream, currently edek is used directly....
http://issues.apache.org/jira/browse/HDFS-6724    Author: Yi Liu, 2014-07-25, 19:33
[HDFS-6720] Remove KeyProvider in EncryptionZoneManager - HDFS - [issue]
...We don't need KeyProvider in EncryptionZoneManager any more, so we need to remove KeyProvider variable in class and KeyProvider parameter for EncryptionZoneManager#createEncryptionZone...
http://issues.apache.org/jira/browse/HDFS-6720    Author: Yi Liu, 2014-07-22, 18:57
[HDFS-6405] Test Crypto streams in HDFS - HDFS - [issue]
...Test file write/read, syncable, positioned read, seek and others for Crypto streams....
http://issues.apache.org/jira/browse/HDFS-6405    Author: Yi Liu, 2014-07-16, 20:04
[HDFS-6606] Optimize encryption support in DataTransfer Protocol with High 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,  it supports three security strength: high...
http://issues.apache.org/jira/browse/HDFS-6606    Author: Yi Liu, 2014-07-01, 17:34
[HDFS-6615] Replace java.security.SecureRandom with org.apache.hadoop.crypto.random.SecureRandom in HDFS - HDFS - [issue]
...In java, SecureRandom is slow and is pseudo random bytes.In HADOOP-10734, we implement true secure random using hardware random number generator, it has high performance about 22x speedup. I...
http://issues.apache.org/jira/browse/HDFS-6615    Author: Yi Liu, 2014-07-01, 14:59
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