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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
[HDFS-5058] QJM should validate startLogSegment() more strictly - HDFS - [issue]
...We've seen a small handful of times a case where one of the NNs in an HA cluster ends up with an fsimage checkpoint that falls in the middle of an edit segment. We're not sure yet how this h...
http://issues.apache.org/jira/browse/HDFS-5058    Author: Todd Lipcon, 2013-09-05, 15:45
Re: Long time fail over when using QJM - HDFS - [mail # dev]
...If you're seeing those log messages, the SBN was already active at that time. It only logs that message when successfully writing transactions. So, the failover must have already completed b...
   Author: Todd Lipcon, 2013-08-29, 16:53
[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
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