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Update format_version comment

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Summary: We added a new format version. Reflect that in the comments.

Test Plan: none

Reviewers: sdong, rven, yhchiang, MarkCallaghan

Reviewed By: MarkCallaghan

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D31629
This commit is contained in:
Igor Canadi 2015-01-16 09:18:45 -08:00
parent 155bec4cf2
commit 3d628f8f22
1 changed files with 7 additions and 3 deletions
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10
include/rocksdb/table.h
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@ -127,7 +127,7 @@ struct BlockBasedTableOptions {
bool whole_key_filtering = true;
// For more details on BlockBasedTable's formats, see FORMAT-CHANGES.md
// We currently have two versions:
// We currently have three versions:
// 0 -- This version is currently written out by all RocksDB's versions by
// default. Can be read by really old RocksDB's. Doesn't support changing
// checksum (default is CRC32).
@ -135,8 +135,12 @@ struct BlockBasedTableOptions {
// checksum, like xxHash. It is written by RocksDB when
// BlockBasedTableOptions::checksum is something other than kCRC32c. (version
// 0 is silently upconverted)
// This only affects newly written tables. When reading exising tables, the
// information about version is read from the footer.
// 2 -- Can be read by RocksDB's versions since 3.10. Changes the way we
// encode compressed blocks with LZ4, BZip2 and Zlib compression. If you
// don't plan to run RocksDB before version 3.10, you should probably use
// this.
// This option only affects newly written tables. When reading exising tables,
// the information about version is read from the footer.
uint32_t format_version = 0;
};