On Fri, Jul 27, 2012 at 7:25 AM, Alex Baranau <[email protected]>wrote:
> Very good explanation (and food for thinking) about using bloom filters in > HBase in answers here: > http://www.quora.com/How-are-bloom-filters-used-in-HBase. > > Should we put the link to it from Apache HBase book (ref guide)? > Thanks this is helpful > > Alex Baranau > ------ > Sematext :: http://blog.sematext.com/ :: Hadoop - HBase - ElasticSearch - > Solr > > On Thu, Jul 26, 2012 at 8:38 PM, Mohit Anchlia <[email protected] > >wrote: > > > On Thu, Jul 26, 2012 at 1:52 PM, Minh Duc Nguyen <[email protected]> > > wrote: > > > > > Mohit, > > > > > > According to HBase: The Definitive Guide, > > > > > > The row+column Bloom filter is useful when you cannot batch updates > for a > > > specific row, and end up with store files which all contain parts of > the > > > row. The more specific row+column filter can then identify which of the > > > files contain the data you are requesting. Obviously, if you always > load > > > the entire row, this filter is once again hardly useful, as the region > > > server will need to load the matching block out of each file anyway. > > Since > > > the row+column filter will require more storage, you need to do the > math > > to > > > determine whether it is worth the extra resources. > > > > > > > Thanks! I have a timeseries data so I am thinking I should enable bloom > > filters for only rows > > > > > > > > > > > ~ Minh > > > > > > On Thu, Jul 26, 2012 at 4:30 PM, Mohit Anchlia <[email protected] > > > >wrote: > > > > > > > Is it advisable to enable bloom filters on the column family? > > > > > > > > Also, why is it called global kill switch? > > > > > > > > Bloom Filter Configuration > > > > 2.9.1. io.hfile.bloom.enabled global kill switch > > > > > > > > io.hfile.bloom.enabled in Configuration serves as the kill switch in > > case > > > > something goes wrong. Default = true. > > > > > > > > > > > > > -- > Alex Baranau > ------ > Sematext :: http://blog.sematext.com/ :: Hadoop - HBase - ElasticSearch - > Solr >
