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[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
Re: Question regarding access to different hadoop 2.0 cluster - HDFS - [mail # dev]
...We've discussed a few times adding a FailoverProxyProvider which would use DNS records for this. For example, you'd add a SRV record (or multiple A records) for the logical name, pointing to...
   Author: Todd Lipcon, 2013-11-06, 19:40
BKJM - anyone using it? - HDFS - [mail # dev]
...Hey folks,  Is anyone using BKJM? The BookKeeper-based HA approach was developed around the same time as QuorumJournalManager, but I haven't seen much reported about it in the last year...
   Author: Todd Lipcon, 2013-11-05, 20:06
[HDFS-5037] Active NN should trigger its own edit log rolls - HDFS - [issue]
...We've seen cases where the SBN/2NN went down, and then users accumulated very very large edit log segments. This causes a slow startup time because the last edit log segment must be read ful...
http://issues.apache.org/jira/browse/HDFS-5037    Author: Todd Lipcon, 2013-11-02, 13:34
Re: Datanode fencing mechanism - HDFS - [mail # dev]
...Hi Liu Le,  You're correct, that's an oversight that was designed but never implemented. It's quite a rare circumstance but we should probably implement the persistent promise as you su...
   Author: Todd Lipcon, 2013-10-29, 03:00
[HDFS-2956] calling fetchdt without a --renewer argument throws NPE - HDFS - [issue]
...If I call "bin/hdfs fetchdt /tmp/mytoken" without a "--renewer foo" argument, then it will throw a NullPointerException:Exception in thread "main" java.lang.NullPointerException   ...
http://issues.apache.org/jira/browse/HDFS-2956    Author: Todd Lipcon, 2013-10-03, 06:46
[HDFS-3958] Integrate upgrade/finalize/rollback with external journals - HDFS - [issue]
...Currently the NameNode upgrade/rollback/finalize framework only supports local storage. With edits being stored in pluggable Journals, this could create certain difficulties - in particular,...
http://issues.apache.org/jira/browse/HDFS-3958    Author: Todd Lipcon, 2013-10-02, 23:14
[HDFS-5287] JN need not validate finalized log segments in newEpoch - HDFS - [issue]
...In scanStorageForLatestEdits, the JN will call validateLog on the last log segment, regardless of whether it is finalized. If it's finalized, then this is a needless pass over the logs which...
http://issues.apache.org/jira/browse/HDFS-5287    Author: Todd Lipcon, 2013-10-01, 18:38
[HDFS-4879] Add "blocked ArrayList" collection to avoid CMS full GCs - HDFS - [issue]
...We recently saw an issue where a large deletion was issued which caused 25M blocks to be collected during deleteInternal. Currently, the list of collected blocks is an ArrayList, meaning tha...
http://issues.apache.org/jira/browse/HDFS-4879    Author: Todd Lipcon, 2013-09-07, 14:43
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