[GitHub] [incubator-pegasus] hycdong commented on a change in pull request #738: doc: add rfc about user specified compaction

[GitBox <gi...@apache.org>]

hycdong commented on a change in pull request #738:
URL: https://github.com/apache/incubator-pegasus/pull/738#discussion_r640292489



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File path: rfcs/2021-05-27-user-specified-compaction.md
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@@ -0,0 +1,40 @@
+# User Specified Compaction
+
+## Summary
+
+In pegasus, sometimes we should add user specified compaction policy to reduce disk usage. This RFC proposes a user specified compaction design.
+
+## Design
+
+Add two classes named with `compaction_operation` and `compaction_rule`.
+
+`compaction_filter_rule` represents the compaction rule to filter the keys which are stored in rocksdb.
+There are three types of compaction filter rule:
+1. hashkey rule, which supports prefix match, postfix match and anywhere match.
+2. sortkey rule. Just like hashkey rule, it also supports prefix match, postfix match and anywhere match.
+3. ttl rule. It supports time range match with format [begin_ttl, end_ttl]
+
+`compaction_operation` represents the compaction operation. A compaction operation will be executed when all the corresponding compaction rules are matched.
+There are two types of compaction filter rule:

Review comment:
       There are two types of compaction operation




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