Make OffpeakTimeInfo available in VersionSet (#12018)

Summary:
As mentioned in  https://github.com/facebook/rocksdb/issues/11893, we are going to use the offpeak time information to pre-process TTL-based compactions. To do so, we need to access `daily_offpeak_time_utc` in `VersionStorageInfo::ComputeCompactionScore()` where we pick the files to compact. This PR is to make the offpeak time information available at the time of compaction-scoring. We are not changing any compaction scoring logic just yet. Will follow up in a separate PR.

There were two ways to achieve what we want.
1.  Make `MutableDBOptions` available in `ColumnFamilyData` and `ComputeCompactionScore()` take `MutableDBOptions` along with `ImmutableOptions` and `MutableCFOptions`.
2. Make `daily_offpeak_time_utc` and `IsNowOffpeak()` available in `VersionStorageInfo`.

We chose the latter as it involves smaller changes.

This change includes the following
- Introduction of `OffpeakTimeInfo` and `IsNowOffpeak()` has been moved from `MutableDBOptions`
- `OffpeakTimeInfo` added to `VersionSet` and it can be set during construction and by `ChangeOffpeakTimeInfo()`
- During `SetDBOptions()`, if offpeak time info needs to change, it calls `MaybeScheduleFlushOrCompaction()` to re-compute compaction scores and process compactions as needed

Pull Request resolved: https://github.com/facebook/rocksdb/pull/12018

Test Plan:
- `DBOptionsTest::OffpeakTimes` changed to include checks for `MaybeScheduleFlushOrCompaction()` calls and `VersionSet`'s OffpeakTimeInfo value change during `SetDBOptions()`.
- `VersionSetTest::OffpeakTimeInfoTest` added to test `ChangeOffpeakTimeInfo()`. `IsNowOffpeak()` tests moved from `DBOptionsTest::OffpeakTimes`

Reviewed By: pdillinger

Differential Revision: D50723881

Pulled By: jaykorean

fbshipit-source-id: 3cff0291936f3729c0e9c7750834b9378fb435f6

2 files changed, 11 insertions, 8 deletions

diff --git a/db/compaction/compaction_job_test.cc b/db/compaction/compaction_job_test.cc
index 8bf3132a1..eccd57701 100644
--- a/db/compaction/compaction_job_test.cc
+++ b/db/compaction/compaction_job_test.cc
@@ -215,7 +215,8 @@ class CompactionJobTestBase : public testing::Test {
             dbname_, &db_options_, env_options_, table_cache_.get(),
             &write_buffer_manager_, &write_controller_,
             /*block_cache_tracer=*/nullptr,
-            /*io_tracer=*/nullptr, /*db_id*/ "", /*db_session_id*/ "")),
+            /*io_tracer=*/nullptr, /*db_id*/ "", /*db_session_id*/ "",
+            /*daily_offpeak_time_utc*/ "")),
         shutting_down_(false),
         mock_table_factory_(new mock::MockTableFactory()),
         error_handler_(nullptr, db_options_, &mutex_),
@@ -540,11 +541,11 @@ class CompactionJobTestBase : public testing::Test {
     ASSERT_OK(s);
     db_options_.info_log = info_log;
 
-    versions_.reset(
-        new VersionSet(dbname_, &db_options_, env_options_, table_cache_.get(),
-                       &write_buffer_manager_, &write_controller_,
-                       /*block_cache_tracer=*/nullptr, /*io_tracer=*/nullptr,
-                       /*db_id*/ "", /*db_session_id*/ ""));
+    versions_.reset(new VersionSet(
+        dbname_, &db_options_, env_options_, table_cache_.get(),
+        &write_buffer_manager_, &write_controller_,
+        /*block_cache_tracer=*/nullptr, /*io_tracer=*/nullptr,
+        /*db_id*/ "", /*db_session_id*/ "", /*daily_offpeak_time_utc*/ ""));
     compaction_job_stats_.Reset();
     ASSERT_OK(SetIdentityFile(env_, dbname_));
 
diff --git a/db/compaction/compaction_picker_test.cc b/db/compaction/compaction_picker_test.cc
index 64326a95c..a5184c956 100644
--- a/db/compaction/compaction_picker_test.cc
+++ b/db/compaction/compaction_picker_test.cc
@@ -85,7 +85,8 @@ class CompactionPickerTestBase : public testing::Test {
     vstorage_.reset(new VersionStorageInfo(
         &icmp_, ucmp_, options_.num_levels, style, nullptr, false,
         EpochNumberRequirement::kMustPresent, ioptions_.clock,
-        options_.bottommost_file_compaction_delay));
+        options_.bottommost_file_compaction_delay,
+        OffpeakTimeInfo(mutable_db_options_.daily_offpeak_time_utc)));
     vstorage_->PrepareForVersionAppend(ioptions_, mutable_cf_options_);
   }
 
@@ -95,7 +96,8 @@ class CompactionPickerTestBase : public testing::Test {
     temp_vstorage_.reset(new VersionStorageInfo(
         &icmp_, ucmp_, options_.num_levels, ioptions_.compaction_style,
         vstorage_.get(), false, EpochNumberRequirement::kMustPresent,
-        ioptions_.clock, options_.bottommost_file_compaction_delay));
+        ioptions_.clock, options_.bottommost_file_compaction_delay,
+        OffpeakTimeInfo(mutable_db_options_.daily_offpeak_time_utc)));
   }
 
   void DeleteVersionStorage() {