[GitHub] [incubator-iotdb] LeiRui commented on a change in pull request #466: [IOTDB-208] Bloom filter

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LeiRui commented on a change in pull request #466: [IOTDB-208] Bloom filter
URL: https://github.com/apache/incubator-iotdb/pull/466#discussion_r339290978
 
 

 ##########
 File path: docs/Documentation/UserGuide/4-Operation Manual/8-TsFile Usage.md
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 @@ -620,4 +620,16 @@ and then call:
 TSFileConfig config = TSFileDescriptor.getInstance().getConfig();
 ```
 
+## Bloom filter
+
+Bloom filter check whether a given time series might in the tsfile before load metadata. This can improve the performance of loading metadata and skip tsfile that doesn't contains specified time series.
+If you want to learn more about its mechanism, you can refer to: [wiki page of bloom filter](https://en.wikipedia.org/wiki/Bloom_filter).
+
+#### configuration 
+you can control the false positive rate of bloom filter by following parameter in the config file.
 
 Review comment:
   You should tell users where to find this config file. Tell them a detailed file name or path. Just "the config file" is too general.

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