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[HDFS-4618] default for checkpoint txn interval is too low - HDFS - [issue]
...The default checkpoint interval is currently set to 40k transactions. That's way too low (I don't know what idiot set it to that.. oh wait, it was me...)The old default in 1.0 is 64MB. Assum...
http://issues.apache.org/jira/browse/HDFS-4618    Author: Todd Lipcon, 2013-03-29, 14:05
[HDFS-4621] additional logging to help diagnose slow QJM logSync - HDFS - [issue]
...I've been working on diagnosing an issue with a cluster which is seeing slow logSync calls occasionally to QJM. Adding a few more pieces of logging would help this: in the warning messages o...
http://issues.apache.org/jira/browse/HDFS-4621    Author: Todd Lipcon, 2013-03-29, 14:05
[HDFS-4638] TransferFsImage should take Configuration as parameter - HDFS - [issue]
...TransferFsImage currently creates a new HdfsConfiguration object, rather than taking one passed in. This means that using dfsadmin -fetchImage, you can't pass a different timeout on the comm...
http://issues.apache.org/jira/browse/HDFS-4638    Author: Todd Lipcon, 2013-03-28, 23:51
[HDFS-4617] warning while purging logs with QJM enabled - HDFS - [issue]
...HDFS-2946 changed the way that edit log purging is calculated, such that it calls selectInputStreams() with an arbitrary transaction ID calculated relative to the current one. The JournalNod...
http://issues.apache.org/jira/browse/HDFS-4617    Author: Todd Lipcon, 2013-03-28, 04:43
[HDFS-2554] Add separate metrics for missing blocks with desired replication level 1 - HDFS - [issue]
...Some users use replication level set to 1 for datasets which are unimportant and can be lost with no worry (eg the output of terasort tests). But other data on the cluster is important and s...
http://issues.apache.org/jira/browse/HDFS-2554    Author: Todd Lipcon, 2013-03-19, 18:53
[HDFS-4380] Opening a file for read before writer writes a block causes NPE - HDFS - [issue]
...JD Cryans found this issue: it seems like, if you open a file for read immediately after it's been created by the writer, after a block has been allocated, but before the block is created on...
http://issues.apache.org/jira/browse/HDFS-4380    Author: Todd Lipcon, 2013-03-13, 22:48
[HDFS-4304] Make FSEditLogOp.MAX_OP_SIZE configurable - HDFS - [issue]
...Today we ran into an issue where a NN had logged a very large op, greater than the 1.5MB MAX_OP_SIZE constant. In order to successfully load the edits, we had to patch with a larger constant...
http://issues.apache.org/jira/browse/HDFS-4304    Author: Todd Lipcon, 2013-02-23, 14:05
[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, 2013-02-08, 21:56
[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, 2013-02-08, 16:42
[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, 2013-02-06, 17:05
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