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[rocksdb] make init prefix more robust

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Summary:
Currently if client uses kNULLString as the prefix, it will confuse
compaction filter v2. This diff added a bool to indicate if the prefix
has been intialized. I also added a unit test to cover this case and
make sure the new code path is hit.

Test Plan: db_test

Reviewers: igor, haobo

Reviewed By: igor

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17151
This commit is contained in:
Danny Guo 2014-03-25 11:34:31 -07:00
parent 34f9da1cef
commit d9ca83df28
2 changed files with 53 additions and 1 deletions
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4
db/db_impl.cc
View file

@ -2898,6 +2898,7 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
compact->CleanupBatchBuffer();
compact->CleanupMergedBuffer();
compact->cur_prefix_ = kNullString;
bool prefix_initialized = false;
int64_t imm_micros = 0; // Micros spent doing imm_ compactions
Log(options_.info_log,
@ -2986,8 +2987,9 @@ Status DBImpl::DoCompactionWork(CompactionState* compact,
const SliceTransform* transformer =
options_.compaction_filter_factory_v2->GetPrefixExtractor();
std::string key_prefix = transformer->Transform(key).ToString();
if (compact->cur_prefix_ == kNullString) {
if (!prefix_initialized) {
compact->cur_prefix_ = key_prefix;
prefix_initialized = true;
}
if (!ParseInternalKey(key, &ikey)) {
// log error

50
db/db_test.cc
View file

@ -3816,6 +3816,56 @@ TEST(DBTest, CompactionFilterV2WithValueChange) {
}
}
TEST(DBTest, CompactionFilterV2NULLPrefix) {
Options options = CurrentOptions();
options.num_levels = 3;
options.max_mem_compaction_level = 0;
auto prefix_extractor = NewFixedPrefixTransform(8);
options.compaction_filter_factory_v2 =
std::make_shared<ChangeFilterFactoryV2>(prefix_extractor);
// In a testing environment, we can only flush the application
// compaction filter buffer using universal compaction
option_config_ = kUniversalCompaction;
options.compaction_style = (rocksdb::CompactionStyle)1;
Reopen(&options);
// Write 100K+1 keys, these are written to a few files
// in L0. We do this so that the current snapshot points
// to the 100001 key.The compaction filter is not invoked
// on keys that are visible via a snapshot because we
// anyways cannot delete it.
const std::string value(10, 'x');
char first_key[100];
snprintf(first_key, sizeof(first_key), "%s0000%010d", "NULL", 1);
Put(first_key, value);
for (int i = 1; i < 100000; i++) {
char key[100];
snprintf(key, sizeof(key), "%08d%010d", i, i);
Put(key, value);
}
char last_key[100];
snprintf(last_key, sizeof(last_key), "%s0000%010d", "NULL", 2);
Put(last_key, value);
// push all files to lower levels
dbfull()->TEST_FlushMemTable();
dbfull()->TEST_CompactRange(0, nullptr, nullptr);
// verify that all keys now have the new value that
// was set by the compaction process.
std::string newvalue = Get(first_key);
ASSERT_EQ(newvalue.compare(NEW_VALUE), 0);
newvalue = Get(last_key);
ASSERT_EQ(newvalue.compare(NEW_VALUE), 0);
for (int i = 1; i < 100000; i++) {
char key[100];
snprintf(key, sizeof(key), "%08d%010d", i, i);
std::string newvalue = Get(key);
ASSERT_EQ(newvalue.compare(NEW_VALUE), 0);
}
}
TEST(DBTest, SparseMerge) {
do {
Options options = CurrentOptions();