Hide event listeners from lite build

Summary:
Fixing lite build failure introduce by #2169.
Closes https://github.com/facebook/rocksdb/pull/2174

Reviewed By: sagar0

Differential Revision: D4910619

Pulled By: yiwu-arbug

fbshipit-source-id: 5213b7b7431cc258688793c8c28153025588d8d9

db/compaction_iterator.cc

@@ -10,6 +10,7 @@
 
 namespace rocksdb {
 
+#ifndef ROCKSDB_LITE
 CompactionEventListener::CompactionListenerValueType fromInternalValueType(
     ValueType vt) {
   switch (vt) {
@@ -30,6 +31,7 @@ CompactionEventListener::CompactionListenerValueType fromInternalValueType(
       return CompactionEventListener::CompactionListenerValueType::kInvalid;
   }
 }
+#endif  // ROCKSDB_LITE
 
 CompactionIterator::CompactionIterator(
     InternalIterator* input, const Comparator* cmp, MergeHelper* merge_helper,
@@ -213,11 +215,13 @@ void CompactionIterator::NextFromInput() {
       current_user_key_sequence_ = kMaxSequenceNumber;
       current_user_key_snapshot_ = 0;
 
+#ifndef ROCKSDB_LITE
       if (compaction_listener_) {
         compaction_listener_->OnCompaction(compaction_->level(), ikey_.user_key,
                                            fromInternalValueType(ikey_.type),
                                            value_, ikey_.sequence, true);
       }
+#endif  // ROCKSDB_LITE
 
       // apply the compaction filter to the first occurrence of the user key
       if (compaction_filter_ != nullptr && ikey_.type == kTypeValue &&
@@ -266,11 +270,13 @@ void CompactionIterator::NextFromInput() {
         }
       }
     } else {
+#ifndef ROCKSDB_LITE
       if (compaction_listener_) {
         compaction_listener_->OnCompaction(compaction_->level(), ikey_.user_key,
                                            fromInternalValueType(ikey_.type),
                                            value_, ikey_.sequence, false);
       }
+#endif  // ROCKSDB_LITE
 
       // Update the current key to reflect the new sequence number/type without
       // copying the user key.

db/compaction_job.cc

@@ -741,12 +741,14 @@ void CompactionJob::ProcessKeyValueCompaction(SubcompactionState* sub_compact) {
 
   // we allow only 1 compaction event listener. Used by blob storage
   CompactionEventListener* comp_event_listener = nullptr;
+#ifndef ROCKSDB_LITE
   for (auto& celitr : cfd->ioptions()->listeners) {
     comp_event_listener = celitr->GetCompactionEventListener();
     if (comp_event_listener != nullptr) {
       break;
     }
   }
+#endif  // ROCKSDB_LITE
 
   Status status;
   sub_compact->c_iter.reset(new CompactionIterator(