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[HDFS-4486] Add log category for long-running DFSClient notices - HDFS - [issue]
...There are a number of features in the DFS client which are transparent but can make a fairly big difference for performance – two in particular are short circuit reads and native check...
http://issues.apache.org/jira/browse/HDFS-4486    Author: Todd Lipcon, 2014-08-21, 00:16
[HDFS-3862] QJM: don't require a fencer to be configured if shared storage has built-in single-writer semantics - HDFS - [issue]
...Currently, NN HA requires that the administrator configure a fencing method to ensure that only a single NameNode may write to the shared storage at a time. Some shared edits storage impleme...
http://issues.apache.org/jira/browse/HDFS-3862    Author: Todd Lipcon, 2014-08-19, 21:55
[HDFS-2949] HA: Add check to active state transition to prevent operator-induced split brain - HDFS - [issue]
...Currently, if the administrator mistakenly calls "-transitionToActive" on one NN while the other one is still active, all hell will break loose. We can add a simple check by having the NN ma...
http://issues.apache.org/jira/browse/HDFS-2949    Author: Todd Lipcon, 2014-08-15, 06:41
[HDFS-845] Balancer documentation should not be in javadoc - HDFS - [issue]
...The best documentation for the balancer currently exists as a large JavaDoc on the Balancer class. This is less than useful, especially since we no longer generate javadocs for HDFS as part ...
http://issues.apache.org/jira/browse/HDFS-845    Author: Todd Lipcon, 2014-07-31, 19:32
[HDFS-1390] Remove or support dfs.web.ugi - HDFS - [issue]
...The HDFS permissions guide still refers to dfs.web.ugi, and there are some vestiges in the code, but it no longer works post-security.We should either remove the vestiges entirely and docume...
http://issues.apache.org/jira/browse/HDFS-1390    Author: Todd Lipcon, 2014-07-31, 00:53
[HDFS-1264] 0.20: OOME in HDFS client made an unrecoverable HDFS block - HDFS - [issue]
...Ran into a bad issue in testing overnight. One of the writers experienced an OOME in the middle of writing a checksum chunk to the stream inside a sync() call. It then proceeded to retry rec...
http://issues.apache.org/jira/browse/HDFS-1264    Author: Todd Lipcon, 2014-07-30, 22:02
[HDFS-1248] Misc cleanup/logging improvements for branch-20-append - HDFS - [issue]
...Last remaining bits of my append branch that didn't fit elsewhere in JIRA (just misc cleanup) Slight cleanup to recoverFile() function in TFA4 Improve error messages on OP_READ_BLOCK Some co...
http://issues.apache.org/jira/browse/HDFS-1248    Author: Todd Lipcon, 2014-07-30, 21:54
[HDFS-1244] Misc improvements to TestFileAppend2 - HDFS - [issue]
...I've made a bunch of improvements to TestFileAppend2: Now has a main() with various command line options to change the workload (number of DNs, number of threads, etc) Sleeps for less time i...
http://issues.apache.org/jira/browse/HDFS-1244    Author: Todd Lipcon, 2014-07-30, 21:28
[HDFS-1243] 0.20 append: Replication tests in TestFileAppend4 should not expect immediate replication - HDFS - [issue]
...The replicationTest() cases in TestFileAppend4 currently assume that the file has both valid replicas immediately after completing the file. However, the datanodes may take some milliseconds...
http://issues.apache.org/jira/browse/HDFS-1243    Author: Todd Lipcon, 2014-07-30, 21:28
[HDFS-1152] appendFile does not recheck lease in second synchronized block - HDFS - [issue]
...FSN.appendFile is made up of two synchronized sections. The second section assumes that the file has not gotten modified during the unsynchronized part in between. We should recheck the leas...
http://issues.apache.org/jira/browse/HDFS-1152    Author: Todd Lipcon, 2014-07-30, 20:30
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