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[HDFS-4982] JournalNode should relogin from keytab before fetching logs from other JNs - HDFS - [issue]
...We've seen an issue in a secure cluster where, after a failover, the new NN isn't able to properly coordinate QJM recovery. The JNs fail to fetch logs from each other due to apparently not h...
http://issues.apache.org/jira/browse/HDFS-4982    Author: Todd Lipcon, 2013-08-27, 23:08
[HDFS-2627] HA: determine DN's view of which NN is active based on heartbeat responses - HDFS - [issue]
...This is the first part of the design described in this comment in HDFS-1972. When the DNs start, they should not consider either of the NNs in a block pool to be the active one. Rather, the ...
http://issues.apache.org/jira/browse/HDFS-2627    Author: Todd Lipcon, 2013-08-23, 01:28
Re: Secure deletion of blocks - HDFS - [mail # dev]
...Hi Matt,  I'd also recommend implementing this in a somewhat pluggable way -- eg a configuration for a Deleter class. The default Deleter can be the one we use today which just removes ...
   Author: Todd Lipcon, 2013-08-15, 21:17
[HDFS-3656] ZKFC may write a null "breadcrumb" znode - HDFS - [issue]
...A user reported an NPE trying to read the "breadcrumb" znode in the failover controller. This happened repeatedly, implying that an earlier process set the znode to null - probably some race...
http://issues.apache.org/jira/browse/HDFS-3656    Author: Todd Lipcon, 2013-08-14, 22:24
[HDFS-3020] Auto-logSync based on edit log buffer size broken - HDFS - [issue]
...HDFS-1112 added a feature whereby the edit log automatically calls logSync() if the buffered data crosses a threshold. However, the code checks bufReady.size() rather than bufCurrent.size() ...
http://issues.apache.org/jira/browse/HDFS-3020    Author: Todd Lipcon, 2013-08-10, 12:33
Re: Feature request to provide DFSInputStream subclassing mechanism - HDFS - [mail # dev]
...Hi Jeff,  Do you need to subclass or could you simply wrap? Generally composition as opposed to inheritance is a lot safer way of integrating software written by different parties, sinc...
   Author: Todd Lipcon, 2013-08-07, 18:25
[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
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