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[HDFS-6524] chooseDataNode decides retry times considering with block replica number - HDFS - [issue]
...Currently the chooseDataNode() does retry with the setting: dfsClientConf.maxBlockAcquireFailures, which by default is 3 (DFS_CLIENT_MAX_BLOCK_ACQUIRE_FAILURES_DEFAULT = 3), it would be bett...
http://issues.apache.org/jira/browse/HDFS-6524    Author: Liang Xie, 2014-06-13, 13:54
[HDFS-6109] let sync_file_range() system call run in background - HDFS - [issue]
...Through we passed SYNC_FILE_RANGE_WRITE to sync_file_range, to make it as asynchronous as possible, it still could be blocked, e.g. the os io request queue is full.Since we use sync_file_ran...
http://issues.apache.org/jira/browse/HDFS-6109    Author: Liang Xie, 2014-06-03, 16:54
[HDFS-6110] adding more slow action log in critical write path - HDFS - [issue]
...After digging a HBase write spike issue caused by slow buffer io in our cluster, just realize we'd better to add more abnormal latency warning log in write flow, such that if other guys hit ...
http://issues.apache.org/jira/browse/HDFS-6110    Author: Liang Xie, 2014-05-31, 16:16
[HDFS-6453] use Time#monotonicNow to avoid system clock reset - HDFS - [issue]
...similiar with hadoop-common, let's re-check and replace System#currentTimeMillis with Time#monotonicNow in HDFS project as well....
http://issues.apache.org/jira/browse/HDFS-6453    Author: Liang Xie, 2014-05-30, 16:18
[HDFS-6448] BlockReaderLocalLegacy should set socket timeout based on conf.socketTimeout - HDFS - [issue]
...Our hbase deployed upon hadoop2.0, in one accident, we hit HDFS-5016 in HDFS side, but we also found from HBase side, the dfs client was hung at getBlockReader, after reading code, we found ...
http://issues.apache.org/jira/browse/HDFS-6448    Author: Liang Xie, 2014-05-30, 16:18
[HDFS-6286] adding a timeout setting for local read io - HDFS - [issue]
...Currently, if a write or remote read requested into a sick disk, DFSClient.hdfsTimeout could help the caller have a guaranteed time cost to return back. but it doesn't work on local read. Ta...
http://issues.apache.org/jira/browse/HDFS-6286    Author: Liang Xie, 2014-05-28, 18:17
[HDFS-5776] Support 'hedged' reads in DFSClient - HDFS - [issue]
...This is a placeholder of hdfs related stuff backport from https://issues.apache.org/jira/browse/HBASE-7509The quorum read ability should be helpful especially to optimize read outlierswe can...
http://issues.apache.org/jira/browse/HDFS-5776    Author: Liang Xie, 2014-05-27, 21:14
[HDFS-6285] tidy an error log inside BlockReceiver - HDFS - [issue]
...From this log from our production cluster:2014-04-22,10:39:05,476 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: IOException in BlockReceiver constructor. Cause is After reading code,...
http://issues.apache.org/jira/browse/HDFS-6285    Author: Liang Xie, 2014-04-25, 10:32
[HDFS-6284] don't let checkDiskError() run concurrently - HDFS - [issue]
...In current codebase, there're amount of  datanode.checkDiskError calls,  so it possible occurs that not a few threads call checkDiskError concurrently. IMHO, it'll be more reasonab...
http://issues.apache.org/jira/browse/HDFS-6284    Author: Liang Xie, 2014-04-25, 03:42
[HDFS-6108] make the length of the range in sync_file_range() configurable - HDFS - [issue]
...Current codebase has a hard code value for sync_file_range system call, we'd better to make it configurable, since different scenario probably has a different/better value for it. (ps: i fou...
http://issues.apache.org/jira/browse/HDFS-6108    Author: Liang Xie, 2014-03-19, 02:34
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