DBTest.DynamicLevelCompressionPerLevel: Tune Threshold

Summary: Each SST's file size increases after we add more table properties. Threshold in DBTest.DynamicLevelCompressionPerLevel need to adjust accordingly to avoid occasional failures.

Test Plan: Run the test

Reviewers: andrewkr, yiwu

Subscribers: leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D60819

db/db_test.cc

@@ -4058,7 +4058,7 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel) {
   options.level0_file_num_compaction_trigger = 2;
   options.level0_slowdown_writes_trigger = 2;
   options.level0_stop_writes_trigger = 2;
-  options.target_file_size_base = 2048;
+  options.target_file_size_base = 20480;
   options.level_compaction_dynamic_level_bytes = true;
   options.max_bytes_for_level_base = 102400;
   options.max_bytes_for_level_multiplier = 4;
@@ -4086,7 +4086,8 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel) {
   ASSERT_EQ(NumTableFilesAtLevel(1), 0);
   ASSERT_EQ(NumTableFilesAtLevel(2), 0);
   ASSERT_EQ(NumTableFilesAtLevel(3), 0);
-  ASSERT_GT(SizeAtLevel(0) + SizeAtLevel(4), 20U * 4000U);
+  // Assuming each files' metadata is at least 50 bytes/
+  ASSERT_GT(SizeAtLevel(0) + SizeAtLevel(4), 20U * 4000U + 50U * 4);
 
   // Insert 400KB. Some data will be compressed
   for (int i = 21; i < 120; i++) {
@@ -4096,7 +4097,8 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel) {
   dbfull()->TEST_WaitForCompact();
   ASSERT_EQ(NumTableFilesAtLevel(1), 0);
   ASSERT_EQ(NumTableFilesAtLevel(2), 0);
-  ASSERT_LT(SizeAtLevel(0) + SizeAtLevel(3) + SizeAtLevel(4), 120U * 4000U);
+  ASSERT_LT(SizeAtLevel(0) + SizeAtLevel(3) + SizeAtLevel(4),
+            120U * 4000U + 50U * 24);
   // Make sure data in files in L3 is not compacted by removing all files
   // in L4 and calculate number of rows
   ASSERT_OK(dbfull()->SetOptions({
@@ -4116,7 +4118,7 @@ TEST_F(DBTest, DynamicLevelCompressionPerLevel) {
     num_keys++;
   }
   ASSERT_OK(iter->status());
-  ASSERT_GT(SizeAtLevel(0) + SizeAtLevel(3), num_keys * 4000U);
+  ASSERT_GT(SizeAtLevel(0) + SizeAtLevel(3), num_keys * 4000U + num_keys * 10U);
 }
 
 TEST_F(DBTest, DynamicLevelCompressionPerLevel2) {