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Fix the logic of setting read_amp_bytes_per_bit from OPTIONS file (#7680)

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Summary:
Instead of using `EncodeFixed32` which always serialize a integer to
little endian, we should use the local machine's endianness when
populating a native data structure during options parsing.
Without this fix, `read_amp_bytes_per_bit` may be populated incorrectly
on big-endian machines.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7680

Test Plan: make check

Reviewed By: pdillinger

Differential Revision: D24999166

Pulled By: riversand963

fbshipit-source-id: dc603cff6e17f8fa32479ce6df93b93082e6b0c4
This commit is contained in:
Yanqin Jin 2020-11-17 00:43:20 -08:00
parent a1f37aa701
commit 8ec8d1275b
2 changed files with 3 additions and 1 deletions
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1
HISTORY.md
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@ -2,6 +2,7 @@
## 6.12.8 (2020-11-15)
### Bug Fixes
* Fix a bug of encoding and parsing BlockBasedTableOptions::read_amp_bytes_per_bit as a 64-bit integer.
* Fixed the logic of populating native data structure for `read_amp_bytes_per_bit` during OPTIONS file parsing on big-endian architecture. Without this fix, original code introduced in PR7659, when running on big-endian machine, can mistakenly store read_amp_bytes_per_bit (an uint32) in little endian format. Future access to `read_amp_bytes_per_bit` will give wrong values. Little endian architecture is not affected.
## 6.12.7 (2020-10-14)
### Other

3
table/block_based/block_based_table_factory.cc
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@ -345,7 +345,8 @@ static std::unordered_map<std::string, OptionTypeInfo>
// generated by affected releases before the fix, we need to
// manually parse read_amp_bytes_per_bit with this special hack.
uint64_t read_amp_bytes_per_bit = ParseUint64(value);
EncodeFixed32(addr, static_cast<uint32_t>(read_amp_bytes_per_bit));
*(reinterpret_cast<uint32_t*>(addr)) =
static_cast<uint32_t>(read_amp_bytes_per_bit);
return Status::OK();
}}},
{"enable_index_compression",