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[HDFS-3751] DN should log warnings for lengthy disk IOs - HDFS - [issue]
...Occasionally failing disks or other OS-and-below issues cause a single IO to take tens of seconds, or even minutes in the case of failures. This often results in timeout exceptions at the cl...
http://issues.apache.org/jira/browse/HDFS-3751    Author: Todd Lipcon, 2014-03-17, 17:19
[HDFS-4301] 2NN image transfer timeout problematic - HDFS - [issue]
...HDFS-1490 added a timeout on image transfer. But, it seems like the timeout is actually applying to the entirety of the image transfer operation. So, if the image or edits are large (multipl...
http://issues.apache.org/jira/browse/HDFS-4301    Author: Todd Lipcon, 2014-03-08, 01:02
[HDFS-2551] fuse-dfs's close() is asynchronous - HDFS - [issue]
...FUSE's "release" operation is called asynchronously when a file is closed from userspace. This means that, if a program writes a file, closes it, and immediately re-opens it, it might not su...
http://issues.apache.org/jira/browse/HDFS-2551    Author: Todd Lipcon, 2014-03-03, 21:27
Re: confirm expected HA behavior - HDFS - [mail # dev]
...Hi Arpit,The issue here is that our transaction log is not a proper "write-aheadlog". In fact, it is a "write-behind" log of sorts -- our generaloperations look something like:- lock namespa...
   Author: Todd Lipcon, 2014-02-07, 19:48
Re: [VOTE] Merge HDFS-5698 Use protobuf to serialize / deserialize FSImage to trunk - HDFS - [mail # dev]
...One question - what's the intention with this work with regard to branch-2?Do you plan to merge it to branch-2, and if so, are you thinking for 2.4 orlater?I'm a little afraid of the diverge...
   Author: Todd Lipcon, 2014-01-30, 23:19
[HDFS-4305] Add a configurable limit on number of blocks per file, and min block size - HDFS - [issue]
...We recently had an issue where a user set the block size very very low and managed to create a single file with hundreds of thousands of blocks. This caused problems with the edit log since ...
http://issues.apache.org/jira/browse/HDFS-4305    Author: Todd Lipcon, 2014-01-28, 17:26
[HDFS-5790] LeaseManager.findPath is very slow when many leases need recovery - HDFS - [issue]
...We recently saw an issue where the NN restarted while tens of thousands of files were open. The NN then ended up spending multiple seconds for each commitBlockSynchronization() call, spendin...
http://issues.apache.org/jira/browse/HDFS-5790    Author: Todd Lipcon, 2014-01-27, 23:04
[HDFS-2994] If lease soft limit is recovered successfully the append can fail - HDFS - [issue]
...I saw the following logs on my test cluster:2012-02-22 14:35:22,887 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: startFile: recover lease [Lease.  Holder: DFSClient_attempt...
http://issues.apache.org/jira/browse/HDFS-2994    Author: Todd Lipcon, 2014-01-07, 18:42
[HDFS-5074] Allow starting up from an fsimage checkpoint in the middle of a segment - HDFS - [issue]
...We've seen the following behavior a couple times: SBN is running and somehow encounters an error in the middle of replaying an edit log in the tailer (eg the JN it's reading from crashes) SB...
http://issues.apache.org/jira/browse/HDFS-5074    Author: Todd Lipcon, 2013-12-11, 14:40
Re: Deprecate BackupNode - HDFS - [mail # dev]
...+1   On Wed, Dec 4, 2013 at 3:06 PM, Suresh Srinivas wrote:     Todd Lipcon Software Engineer, Cloudera...
   Author: Todd Lipcon, 2013-12-04, 23:14
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