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Correct Bloom filter documentation in the book (yi liang)

This commit is contained in:
Jerry He 2016-04-18 09:57:46 -07:00
parent 70687c18bb
commit 31b85e73da
1 changed files with 11 additions and 11 deletions
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22
src/main/asciidoc/_chapters/performance.adoc
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@ -361,7 +361,7 @@ Bloom filters need to be rebuilt upon deletion, so may not be appropriate in env
Bloom filters are enabled on a Column Family.
You can do this by using the setBloomFilterType method of HColumnDescriptor or using the HBase API.
Valid values are `NONE` (the default), `ROW`, or `ROWCOL`.
Valid values are `NONE`, `ROW` (default), or `ROWCOL`.
See <<bloom.filters.when>> for more information on `ROW` versus `ROWCOL`.
See also the API documentation for link:http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HColumnDescriptor.html[HColumnDescriptor].
@ -382,17 +382,17 @@ You can configure the following settings in the _hbase-site.xml_.
| Default
| Description
| io.hfile.bloom.enabled
| io.storefile.bloom.enabled
| yes
| Set to no to kill bloom filters server-wide if something goes wrong
| io.hfile.bloom.error.rate
| io.storefile.bloom.error.rate
| .01
| The average false positive rate for bloom filters. Folding is used to
maintain the false positive rate. Expressed as a decimal representation of a
percentage.
| io.hfile.bloom.max.fold
| io.storefile.bloom.max.fold
| 7
| The guaranteed maximum fold rate. Changing this setting should not be
necessary and is not recommended.
@ -406,7 +406,7 @@ You can configure the following settings in the _hbase-site.xml_.
| Master switch to enable Delete Family Bloom filters and store them in the StoreFile.
| io.storefile.bloom.block.size
| 65536
| 131072
| Target Bloom block size. Bloom filter blocks of approximately this size
are interleaved with data blocks.
@ -713,20 +713,20 @@ Stored in the LRU cache, if it is enabled (It's enabled by default).
[[config.bloom]]
==== Bloom Filter Configuration
===== `io.hfile.bloom.enabled` global kill switch
===== `io.storefile.bloom.enabled` global kill switch
`io.hfile.bloom.enabled` in `Configuration` serves as the kill switch in case something goes wrong.
`io.storefile.bloom.enabled` in `Configuration` serves as the kill switch in case something goes wrong.
Default = `true`.
===== `io.hfile.bloom.error.rate`
===== `io.storefile.bloom.error.rate`
`io.hfile.bloom.error.rate` = average false positive rate.
`io.storefile.bloom.error.rate` = average false positive rate.
Default = 1%. Decrease rate by ½ (e.g.
to .5%) == +1 bit per bloom entry.
===== `io.hfile.bloom.max.fold`
===== `io.storefile.bloom.max.fold`
`io.hfile.bloom.max.fold` = guaranteed minimum fold rate.
`io.storefile.bloom.max.fold` = guaranteed minimum fold rate.
Most people should leave this alone.
Default = 7, or can collapse to at least 1/128th of original size.
See the _Development Process_ section of the document link:https://issues.apache.org/jira/secure/attachment/12444007/Bloom_Filters_in_HBase.pdf[BloomFilters in HBase] for more on what this option means.