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Colin Patrick McCabe
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[HDFS-3626] Creating file with invalid path can corrupt edit log
...Joris Bontje reports the following:The following command results in a corrupt NN editlog (note the double slash and reading from stdin):$ cat /usr/share/dict/words | hadoop fs -put - hdfs://...
, 2014-09-04, 00:21
[HDFS-4182] SecondaryNameNode leaks NameCache entries
...We recently saw an issue where a 2NN ran out of memory, even though it had a relatively small fsimage. When we looked at the heap dump, we saw that all of the memory had gone to entries in t...
, 2014-09-04, 00:19
[HDFS-3875] Issue handling checksum errors in write pipeline
...We saw this issue with one block in a large test cluster. The client is storing the data with replication level 2, and we saw the following: the second node in the pipeline detects a checksu...
, 2014-09-04, 00:00
[HDFS-4128] 2NN gets stuck in inconsistent state if edit log replay fails in the middle
...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...
, 2014-09-03, 23:55
[HDFS-3529] Use direct buffers for data in write path
...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...
, 2014-09-01, 04:21
[HDFS-4486] Add log category for long-running DFSClient notices
...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...
, 2014-08-27, 22:27
[HDFS-2949] HA: Add check to active state transition to prevent operator-induced split brain
...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...
, 2014-08-15, 06:41
[HDFS-1390] Remove or support dfs.web.ugi
...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...
, 2014-07-31, 00:53
[HDFS-1264] 0.20: OOME in HDFS client made an unrecoverable HDFS block
...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...
, 2014-07-30, 22:02
[HDFS-1248] Misc cleanup/logging improvements for branch-20-append
...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...
, 2014-07-30, 21:54
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