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update comment of GetNextFile

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Summary: Closes https://github.com/facebook/rocksdb/pull/2377

Differential Revision: D5141274

Pulled By: lightmark

fbshipit-source-id: c237a285b73ad93488c080ea80c71a29a17f1be0
This commit is contained in:
赵星宇 2017-05-26 14:59:21 -07:00 committed by Facebook Github Bot
parent f7bb1a0060
commit d03c34497c
1 changed files with 2 additions and 2 deletions
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4
db/version_set.cc
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@ -136,8 +136,8 @@ class FilePicker {
// Do key range filtering of files or/and fractional cascading if:
// (1) not all the files are in level 0, or
// (2) there are more than 3 Level 0 files
// If there are only 3 or less level 0 files in the system, we skip
// (2) there are more than 3 current level files
// If there are only 3 or less current level files in the system, we skip
// the key range filtering. In this case, more likely, the system is
// highly tuned to minimize number of tables queried by each query,
// so it is unlikely that key range filtering is more efficient than