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[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-3528] Use native CRC32 in DFS write path - HDFS - [issue]
...HDFS-2080 improved the CPU efficiency of the read path by using native SSE-enabled code for CRC verification. Benchmarks of the write path show that it's often CPU bound by checksums as well...
http://issues.apache.org/jira/browse/HDFS-3528    Author: Todd Lipcon, 2013-10-22, 17:40
[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-3245] Add metrics and web UI for cluster version summary - HDFS - [issue]
...With the introduction of protocol compatibility, once HDFS-2983 is committed, we have the possibility that different nodes in a cluster are running different software versions. To aid operat...
http://issues.apache.org/jira/browse/HDFS-3245    Author: Todd Lipcon, 2013-08-28, 15:48
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