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[HDFS-3053] Support for true zero-copy (mmap-based) reads - HDFS - [issue]
...Continuing a discussion started in HDFS-2834, it would be slick to provide support for a true zero-copy read API. In this style API, rather than having the user pass buffers to read into, th...
http://issues.apache.org/jira/browse/HDFS-3053    Author: Todd Lipcon, 2013-07-29, 03:03
Re: I'm interested in working with HDFS-4680. Can somebody be a mentor? - HDFS - [mail # dev]
...I'm happy to help with this as well. I actually have a prototype patch that I built during a hackathon a few months ago, and was able to get a full stack trace including Client, NN, and DN. ...
   Author: Todd Lipcon, 2013-07-18, 00:23
[HDFS-4915] Add config to ZKFC to disable fencing - HDFS - [issue]
...With QuorumJournalManager, it's not important for the ZKFCs to perform any fencing. We currently workaround this by setting the fencer to /bin/true, but the ZKFC still does things like creat...
http://issues.apache.org/jira/browse/HDFS-4915    Author: Todd Lipcon, 2013-07-01, 13:45
Re: A question for txid - HDFS - [mail # dev]
...I did some back of the envelope math when implementing txids, and determined that overflow is not ever going to happen... A "busy" namenode does 1000 write transactions/second (2^10). MAX_LO...
   Author: Todd Lipcon, 2013-06-25, 14:51
[HDFS-1172] Blocks in newly completed files are considered under-replicated too quickly - HDFS - [issue]
...I've seen this for a long time, and imagine it's a known issue, but couldn't find an existing JIRA. It often happens that we see the NN schedule replication on the last block of files very q...
http://issues.apache.org/jira/browse/HDFS-1172    Author: Todd Lipcon, 2013-06-25, 10:24
[expand - 1 more] - Re: DesignLounge @ HadoopSummit - HDFS - [mail # dev]
...Cool, thanks Eric. I don't see any particular need to have a session on QJM don't have any near term road map in mind to discuss. But if anyone else wants to sync up, happy to do so - just l...
   Author: Todd Lipcon, 2013-06-25, 04:44
Re: Heads up: branch-2.1-beta - HDFS - [mail # dev]
...Have you tried running with -XX:+HeapDumpOnOutOfMemoryError? Got a heap dump folks can look at?  The new snapshot stuff may be at fault... other than that, no particular ideas.  On...
   Author: Todd Lipcon, 2013-06-20, 06:10
[HDFS-3792] Fix two findbugs introduced by HDFS-3695 - HDFS - [issue]
...Accidentally introduced two trivial findbugs warnings in HDFS-3695. This JIRA is to fix them....
http://issues.apache.org/jira/browse/HDFS-3792    Author: Todd Lipcon, 2013-06-13, 23:53
Re: dfs.datanode.socket.reuse.keepalive - HDFS - [mail # dev]
...+1 for dropping the client side expiry down to something like 1-2 seconds. I'd rather do that than up the server side, since the server side resource (DN threads) is likely to be more conten...
   Author: Todd Lipcon, 2013-06-10, 17:35
[HDFS-3447] StandbyException should not be logged at ERROR level on server - HDFS - [issue]
...Currently, the standby NN will log StandbyExceptions at ERROR level any time a client tries to connect to it. So, if the second NN in an HA pair is active, the first NN will spew a lot of th...
http://issues.apache.org/jira/browse/HDFS-3447    Author: Todd Lipcon, 2013-06-07, 08:31
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