Add support for FastLRUCache in stress and crash tests. (#10081)

Summary:
Stress tests can run with the experimental FastLRUCache. Crash tests randomly choose between LRUCache and FastLRUCache.

Since only LRUCache supports a secondary cache, we validate the `--secondary_cache_uri` and `--cache_type` flags---when `--secondary_cache_uri` is set, the `--cache_type` is set to `lru_cache`.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10081

Test Plan:
- To test that the FastLRUCache is used and the stress test runs successfully, run `make -j24 CRASH_TEST_EXT_ARGS=—duration=960 blackbox_crash_test_with_atomic_flush`. The cache type should sometimes be `fast_lru_cache`.
- To test the flag validation, run `make -j24 CRASH_TEST_EXT_ARGS="--duration=960 --secondary_cache_uri=x" blackbox_crash_test_with_atomic_flush` multiple times. The test will always be aborted (which is okay). Check that the cache type is always `lru_cache`.

Reviewed By: anand1976

Differential Revision: D36839908

Pulled By: guidotag

fbshipit-source-id: ebcdfdcd12ec04c96c09ae5b9c9d1e613bdd1725

db_stress_tool/db_stress_common.h

@@ -142,7 +142,7 @@ DECLARE_bool(charge_table_reader);
 DECLARE_int32(top_level_index_pinning);
 DECLARE_int32(partition_pinning);
 DECLARE_int32(unpartitioned_pinning);
-DECLARE_bool(use_clock_cache);
+DECLARE_string(cache_type);
 DECLARE_uint64(subcompactions);
 DECLARE_uint64(periodic_compaction_seconds);
 DECLARE_uint64(compaction_ttl);

db_stress_tool/db_stress_gflags.cc

@@ -343,8 +343,7 @@ DEFINE_int32(
     "Type of pinning for unpartitioned metadata blocks (see `enum PinningTier` "
     "in table.h)");
 
-DEFINE_bool(use_clock_cache, false,
-            "Replace default LRU block cache with clock cache.");
+DEFINE_string(cache_type, "lru_cache", "Type of block cache.");
 
 DEFINE_uint64(subcompactions, 1,
               "Maximum number of subcompactions to divide L0-L1 compactions "

db_stress_tool/db_stress_test_base.cc

@@ -10,6 +10,7 @@
 
 #include "util/compression.h"
 #ifdef GFLAGS
+#include "cache/fast_lru_cache.h"
 #include "db_stress_tool/db_stress_common.h"
 #include "db_stress_tool/db_stress_compaction_filter.h"
 #include "db_stress_tool/db_stress_driver.h"
@@ -130,14 +131,17 @@ std::shared_ptr<Cache> StressTest::NewCache(size_t capacity,
   if (capacity <= 0) {
     return nullptr;
   }
-  if (FLAGS_use_clock_cache) {
+
+  if (FLAGS_cache_type == "clock_cache") {
     auto cache = NewClockCache((size_t)capacity);
     if (!cache) {
       fprintf(stderr, "Clock cache not supported.");
       exit(1);
     }
     return cache;
-  } else {
+  } else if (FLAGS_cache_type == "fast_lru_cache") {
+    return NewFastLRUCache((size_t)capacity, num_shard_bits);
+  } else if (FLAGS_cache_type == "lru_cache") {
     LRUCacheOptions opts;
     opts.capacity = capacity;
     opts.num_shard_bits = num_shard_bits;
@@ -161,6 +165,9 @@ std::shared_ptr<Cache> StressTest::NewCache(size_t capacity,
     }
 #endif
     return NewLRUCache(opts);
+  } else {
+    fprintf(stderr, "Cache type not supported.");
+    exit(1);
   }
 }
 

tools/db_crashtest.py

@@ -113,7 +113,7 @@ default_params = {
     "use_direct_reads": lambda: random.randint(0, 1),
     "use_direct_io_for_flush_and_compaction": lambda: random.randint(0, 1),
     "mock_direct_io": False,
-    "use_clock_cache": 0, # currently broken
+    "cache_type": lambda: random.choice(["fast_lru_cache", "lru_cache"]),   # clock_cache is broken
     "use_full_merge_v1": lambda: random.randint(0, 1),
     "use_merge": lambda: random.randint(0, 1),
     # 999 -> use Bloom API
@@ -176,6 +176,7 @@ default_params = {
     "async_io": lambda: random.choice([0, 1]),
     "wal_compression": lambda: random.choice(["none", "zstd"]),
     "verify_sst_unique_id_in_manifest": 1,  # always do unique_id verification
+    "secondary_cache_uri": "",
 }
 
 _TEST_DIR_ENV_VAR = 'TEST_TMPDIR'
@@ -530,6 +531,9 @@ def finalize_and_sanitize(src_params):
         dest_params["enable_compaction_filter"] = 0
         dest_params["sync"] = 0
         dest_params["write_fault_one_in"] = 0
+    if dest_params["secondary_cache_uri"] != "":
+        # Currently the only cache type compatible with a secondary cache is LRUCache
+        dest_params["cache_type"] = "lru_cache"
 
     return dest_params