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[HDFS-6617] Flake TestDFSZKFailoverController.testManualFailoverWithDFSHAAdmin due to a long edit log sync op - HDFS - [issue]
...Just Hit a false alarm testing while working at  HDFS-6614, see https://builds.apache.org/job/PreCommit-HDFS-Build/7259//testReport/org.apache.hadoop.hdfs.server.namenode.ha/TestDFSZKFa...
http://issues.apache.org/jira/browse/HDFS-6617    Author: Liang Xie, 2014-09-03, 20:50
[HDFS-6627] Rename DataNode#checkWriteAccess to checkReadAccess. - HDFS - [issue]
...Just read getReplicaVisibleLength() code and found it, DataNode.checkWriteAccess is only invoked by DataNode.getReplicaVisibleLength(), let's rename it to checkReadAccess to avoid confusing,...
http://issues.apache.org/jira/browse/HDFS-6627    Author: Liang Xie, 2014-09-03, 20:50
[HDFS-6638] shorten test run time with a smaller retry timeout setting - HDFS - [issue]
...similiar with HDFS-6614, i think it's a general test duration optimization tip, so i grep "IOException, will wait for" from a full test run under hdfs project, found several test cases could...
http://issues.apache.org/jira/browse/HDFS-6638    Author: Liang Xie, 2014-09-03, 20:50
[HDFS-6698] try to optimize DFSInputStream.getFileLength() - HDFS - [issue]
...HBase prefers to invoke read() serving scan request, and invoke pread() serving get reqeust. Because pread() almost holds no lock.Let's image there's a read() running, because the definition...
http://issues.apache.org/jira/browse/HDFS-6698    Author: Liang Xie, 2014-08-09, 08:10
[HDFS-6735] A minor optimization to avoid pread() be blocked by read() inside the same DFSInputStream - HDFS - [issue]
...In current DFSInputStream impl, there're a couple of coarser-grained locks in read/pread path, and it has became a HBase read latency pain point so far. In HDFS-6698, i made a minor patch ag...
http://issues.apache.org/jira/browse/HDFS-6735    Author: Liang Xie, 2014-08-08, 08:18
[HDFS-6766] optimize ack notify mechanism to avoid thundering herd issue - HDFS - [issue]
...Currently, DFSOutputStream uses wait/notifyAll to coordinate ack receiving and ack waiting, etc..say there're 5 threads(t1,t2,t3,t4,t5) wait for ack seq no: 1,2,3,4,5, once the no. 1 ack arr...
http://issues.apache.org/jira/browse/HDFS-6766    Author: Liang Xie, 2014-08-07, 22:04
[HDFS-4120] Add a new "-skipSharedEditsCheck" option for BootstrapStandby - HDFS - [issue]
...Per https://issues.apache.org/jira/browse/HDFS-3752?focusedCommentId=13449466&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13449466 , let's introduce a n...
http://issues.apache.org/jira/browse/HDFS-4120    Author: Liang Xie, 2014-07-18, 15:00
[HDFS-6656] flakey TestProcessCorruptBlocks#testByAddingAnExtraDataNode - HDFS - [issue]
...failed in https://builds.apache.org/job/PreCommit-HDFS-Build/7320//testReport/org.apache.hadoop.hdfs.server.namenode/TestProcessCorruptBlocks/testByAddingAnExtraDataNode/...
http://issues.apache.org/jira/browse/HDFS-6656    Author: Liang Xie, 2014-07-11, 04:59
[HDFS-6614] shorten TestPread run time with a smaller retry timeout setting - HDFS - [issue]
...Just notice logs like this from TestPread:DFS chooseDataNode: got # 3 IOException, will wait for 9909.622860072854 msecso i tried to set a smaller retry window value.Before patch: T E S...
http://issues.apache.org/jira/browse/HDFS-6614    Author: Liang Xie, 2014-07-10, 15:55
[HDFS-6574] make sure addToDeadNodes() only be called when there's a connection issue occur - HDFS - [issue]
...My colleague cuijianwei found in a HBase testing scenario, once a bad disk occured, the local read will be skipped and lots of remote reads be requested for a lengthy time, say, tens of minu...
http://issues.apache.org/jira/browse/HDFS-6574    Author: Liang Xie, 2014-06-20, 09:46
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