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[HDFS-4128] 2NN gets stuck in inconsistent state if edit log replay fails in the middle - HDFS - [issue]
...We saw the following issue in a cluster: The 2NN downloads an edit log segment:2012-10-29 12:30:57,433 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Reading /xxxxxxx/current/edits_000...
http://issues.apache.org/jira/browse/HDFS-4128    Author: Todd Lipcon, 2014-09-03, 23:55
[HDFS-3529] Use direct buffers for data in write path - HDFS - [issue]
...The write path currently makes several unnecessary data copies in order to go to and from byte arrays. We can improve performance by using direct byte buffers to avoid the copy. This is also...
http://issues.apache.org/jira/browse/HDFS-3529    Author: Todd Lipcon, 2014-09-01, 04:21
[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, 2014-08-27, 22:27
Re: Updates on migration to git - HDFS - [mail # dev]
...Hey Karthik,Just to confirm, have we disabled force-push support on the repo?In my experience, especially when a project has committers new to git,force-push support causes more trouble than...
   Author: Todd Lipcon, 2014-08-27, 00:48
[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
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