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Fix level size overflow for options_.level_compaction_dynamic_level_bytes=true

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Summary: Int is used for level size targets when options_.level_compaction_dynamic_level_bytes=true, which will cause overflow when database grows big. Fix it.

Test Plan: Add a new unit test which fails without the fix.

Reviewers: rven, yhchiang, MarkCallaghan, igor

Reviewed By: igor

Subscribers: leveldb, dhruba, yoshinorim

Differential Revision: https://reviews.facebook.net/D36453
This commit is contained in:
sdong 2015-04-02 22:24:50 -07:00
parent 089509b847
commit a7ac6cef1f
2 changed files with 26 additions and 6 deletions
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13
db/version_set.cc
View File

@ -1604,12 +1604,12 @@ void VersionStorageInfo::CalculateBaseBytes(const ImmutableCFOptions& ioptions,
}
// Calculate base level and its size.
int base_level_size;
uint64_t base_level_size;
if (cur_level_size <= base_bytes_min) {
// Case 1. If we make target size of last level to be max_level_size,
// target size of the first non-empty level would be smaller than
// base_bytes_min. We set it be base_bytes_min.
base_level_size = static_cast<int>(base_bytes_min + 1);
base_level_size = base_bytes_min + 1U;
base_level_ = first_non_empty_level;
Warn(ioptions.info_log,
"More existing levels in DB than needed. "
@ -1625,16 +1625,17 @@ void VersionStorageInfo::CalculateBaseBytes(const ImmutableCFOptions& ioptions,
if (cur_level_size > base_bytes_max) {
// Even L1 will be too large
assert(base_level_ == 1);
base_level_size = static_cast<int>(base_bytes_max);
base_level_size = base_bytes_max;
} else {
base_level_size = static_cast<int>(cur_level_size);
base_level_size = cur_level_size;
}
}
int level_size = base_level_size;
uint64_t level_size = base_level_size;
for (int i = base_level_; i < num_levels_; i++) {
if (i > base_level_) {
level_size = level_size * options.max_bytes_for_level_multiplier;
level_size = MultiplyCheckOverflow(
level_size, options.max_bytes_for_level_multiplier);
}
level_max_bytes_[i] = level_size;
}

19
db/version_set_test.cc
View File

@ -215,6 +215,25 @@ TEST_F(VersionStorageInfoTest, MaxBytesForLevelDynamicLotsOfData) {
ASSERT_EQ(0, logger_->log_count);
}
TEST_F(VersionStorageInfoTest, MaxBytesForLevelDynamicLargeLevel) {
uint64_t kOneGB = 1000U * 1000U * 1000U;
ioptions_.level_compaction_dynamic_level_bytes = true;
mutable_cf_options_.max_bytes_for_level_base = 10U * kOneGB;
mutable_cf_options_.max_bytes_for_level_multiplier = 10;
Add(0, 1U, "1", "2", 50U);
Add(3, 4U, "1", "2", 32U * kOneGB);
Add(4, 5U, "1", "2", 500U * kOneGB);
Add(5, 6U, "1", "2", 3000U * kOneGB);
vstorage_.CalculateBaseBytes(ioptions_, mutable_cf_options_);
ASSERT_EQ(vstorage_.MaxBytesForLevel(5), 3000U * kOneGB);
ASSERT_EQ(vstorage_.MaxBytesForLevel(4), 300U * kOneGB);
ASSERT_EQ(vstorage_.MaxBytesForLevel(3), 30U * kOneGB);
ASSERT_EQ(vstorage_.MaxBytesForLevel(2), 3U * kOneGB);
ASSERT_EQ(vstorage_.base_level(), 2);
ASSERT_EQ(0, logger_->log_count);
}
class FindLevelFileTest : public testing::Test {
public:
LevelFilesBrief file_level_;