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HBase Users Group: March 27 @ StumbleUpon - HBase - [mail # user]
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...We will be hosting a HBase users group in two weeks (Tuesday, March 27 @ 6P M) at StumbleUpon HQ. This is a perfect opportunity for people evaluating HBase to meet other users, n...
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Author: Nicolas Spiegelberg,
2012-03-12, 15:59
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[proposal] HUG, March 27 @ SU - HBase - [mail # user]
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...Looking for +1s on a March 27th HBase Users Group. Just want to make sure there are no huge conflicts before we post the official meetup. StumbleUpo n has shiny new office ...
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Author: Nicolas Spiegelberg,
2012-03-07, 21:48
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Re: DISCUSS: Have hbase require at least hadoop 1.0.0 in hbase 0.96.0? - HBase - [mail # dev]
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...I'm wondering why HDFS security support should be mandatory? Append makes sense because there's no way to have a durable system without it. Security is currently an optional feature & ...
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Author: Nicolas Spiegelberg,
2012-03-02, 20:57
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Re: manual trigger of major compaction does not seems to work on 0.92 - HBase - [mail # dev]
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...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 ...
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Author: Nicolas Spiegelberg,
2012-02-24, 16:36
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Re: LIRS cache as an alternative to LRU cache - HBase - [mail # dev]
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...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 ...
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Author: Nicolas Spiegelberg,
2012-02-21, 18:53
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Re: LIRS cache as an alternative to LRU cache - HBase - [mail # dev]
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...Vlad, You're correct. The existing algorithm is called an Adaptive Replacement Cache. However, note that this cache does need some proper tuning for optimal efficiency. &nb...
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Author: Nicolas Spiegelberg,
2012-02-21, 17:19
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Re: LIRS cache as an alternative to LRU cache - HBase - [mail # dev]
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...We had the author of LIRS come to Facebook last year to talk about his algorithm and general benefits. At the time, we were looking at increasing block cache efficiency. The gene...
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Author: Nicolas Spiegelberg,
2012-02-21, 17:01
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Re: HBase and Data Locality - HBase - [mail # user]
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...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...
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Author: Nicolas Spiegelberg,
2012-02-21, 16:56
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Re: Major Compaction Concerns - HBase - [mail # dev]
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...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...
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Author: Nicolas Spiegelberg,
2012-02-20, 03:47
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Re: Scans and Bloom Filter - HBase - [mail # user]
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...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...
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Author: Nicolas Spiegelberg,
2012-02-16, 20:52
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