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Fix SIGSEGV issue in universal compaction

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Summary:
We saw SIGSEGV when set options.num_levels=1 in universal compaction
style. Dug into this issue for a while, and finally found the root cause (thank Haobo for discussion).

Test Plan: Add new unit test. It throws SIGSEGV without this change. Also run "make all check".

Reviewers: haobo, dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D13251
This commit is contained in:
Xing Jin 2013-10-02 16:20:17 -07:00
parent 6b34021fc2
commit 658a3ce2fa
2 changed files with 34 additions and 1 deletions
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2
db/db_impl.cc
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@ -2126,7 +2126,7 @@ Status DBImpl::DoCompactionWork(CompactionState* compact) {
}
mutex_.Lock();
stats_[compact->compaction->level() + 1].Add(stats);
stats_[compact->compaction->output_level()].Add(stats);
// if there were any unused file number (mostly in case of
// compaction error), free up the entry from pending_putputs

33
db/db_test.cc
View File

@ -1803,6 +1803,39 @@ TEST(DBTest, UniversalCompactionSizeAmplification) {
ASSERT_EQ(NumTableFilesAtLevel(0), 1);
}
TEST(DBTest, UniversalCompactionOptions) {
Options options = CurrentOptions();
options.compaction_style = kCompactionStyleUniversal;
options.write_buffer_size = 100<<10; //100KB
options.level0_file_num_compaction_trigger = 4;
options.num_levels = 1;
Reopen(&options);
Random rnd(301);
int key_idx = 0;
for (int num = 0;
num < options.level0_file_num_compaction_trigger;
num++) {
// Write 120KB (12 values, each 10K)
for (int i = 0; i < 12; i++) {
ASSERT_OK(Put(Key(key_idx), RandomString(&rnd, 10000)));
key_idx++;
}
dbfull()->TEST_WaitForCompactMemTable();
if (num < options.level0_file_num_compaction_trigger - 1) {
ASSERT_EQ(NumTableFilesAtLevel(0), num + 1);
}
}
dbfull()->TEST_WaitForCompact();
ASSERT_EQ(NumTableFilesAtLevel(0), 1);
for (int i = 1; i < options.num_levels ; i++) {
ASSERT_EQ(NumTableFilesAtLevel(i), 0);
}
}
TEST(DBTest, ConvertCompactionStyle) {
Random rnd(301);
int max_key_level_insert = 200;