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Re: manual trigger of major compaction does not seems to work on 0.92 - HBase - [mail # dev]
...In 0.92, we can handle multiple compactions but we wait on major compact if minor compactions are ongoing for the same store.  It should be enqueued and work after the minor compaction ...
   Author: Nicolas Spiegelberg, 2012-02-24, 16:36
Re: LIRS cache as an alternative to LRU cache - HBase - [mail # dev]
...In general, I agree about making isolated algorithms pluggable.  In this particular case, I think that Ted was trying to gather consensus on ways to increase cache efficiency with LIRS ...
3 emails [+ more]    Author: Nicolas Spiegelberg, 2012-02-21, 18:53
Re: HBase and Data Locality - HBase - [mail # user]
...Note that the importance of non-peak major compactions should be mitigated in 0.92 with multi-threaded compactions.  This config recommendation is not a general solution but a way to co...
   Author: Nicolas Spiegelberg, 2012-02-21, 16:56
Re: Major Compaction Concerns - HBase - [mail # dev]
...Since Bloom Filters are a probabilistic optimization, it's kinda hard to analyze your efficiency.  Mostly, we rely on theory and a little bit of experimentation.  Basically, you wa...
5 emails [+ more]    Author: Nicolas Spiegelberg, 2012-02-20, 03:47
Re: Scans and Bloom Filter - HBase - [mail # user]
...Bryan,  Currently, ROW & ROWCOL Bloom Filters are only checked for explicit, single-row 'Get' scans.  ROWCOL BFs are only checked when you're querying for explicit column qualifier...
   Author: Nicolas Spiegelberg, 2012-02-16, 20:52
Re: Set like functionality - HBase - [mail # user]
...A lot of your design depends on your read/write rate & the amount of duplication in your inserts.  For example, if your read rate is really low and your write rate is really high with a...
   Author: Nicolas Spiegelberg, 2012-02-10, 19:52
Re: svn commit: r1239930 - in /hbase/branches/0.89-fb/src: main/java/org/apache/hadoop/hbase/master/SplitLogManager.java test/java/org/apache/hadoop/hbase/master/TestSplitLogManager.java - HBase - [mail # dev]
...@Stack: this is an 89-master change.  It should have that tag.  I'll look to figure out why the precommit hook isn't working properly.  On 2/2/12 8:59 PM, "Stack"  wrote:...
   Author: Nicolas Spiegelberg, 2012-02-03, 18:52
Re: hbase 0.94.0 - HBase - [mail # dev]
...Correct.  Sorry for the confusion.  I just meant that we shouldn't get rid of the HFileV1 Reader because it allows online upgrades to happen as compactions happen.  Trying to ...
7 emails [+ more]    Author: Nicolas Spiegelberg, 2012-02-03, 01:24
Re: the occasion of the major compact? - HBase - [mail # user]
...As an aside,  If you can't wait for HBASE-4536 and trunk to get RC'd, you can just add a 'Delete' column to logically serve as a client-side delete marker instead of issuing the actual ...
2 emails [+ more]    Author: Nicolas Spiegelberg, 2012-01-26, 21:22
Re: Changing our logo purple to International Orange (Engineering) - HBase - [mail # dev]
...+1  It's much more visible and bold.  I like the Golden Gate reference...  On 1/11/12 8:42 AM, "Stack"  wrote:  ...
   Author: Nicolas Spiegelberg, 2012-01-11, 22:34
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