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[HDFS-4182] SecondaryNameNode leaks NameCache entries - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-4182    Author: Todd Lipcon, 2014-09-04, 00:19
[HDFS-3077] Quorum-based protocol for reading and writing edit logs - HDFS - [issue]
...Currently, one of the weak points of the HA design is that it relies on shared storage such as an NFS filer for the shared edit log. One alternative that has been proposed is to depend on Bo...
http://issues.apache.org/jira/browse/HDFS-3077    Author: Todd Lipcon, 2014-09-04, 00:05
[HDFS-3875] Issue handling checksum errors in write pipeline - HDFS - [issue]
...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...
http://issues.apache.org/jira/browse/HDFS-3875    Author: Todd Lipcon, 2014-09-04, 00:00
[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
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB