diff --git a/eden/common/utils/UnboundedQueueExecutor.cpp b/eden/common/utils/UnboundedQueueExecutor.cpp
index 0bba0bf8..66c91478 100644
--- a/eden/common/utils/UnboundedQueueExecutor.cpp
+++ b/eden/common/utils/UnboundedQueueExecutor.cpp
@@ -27,4 +27,14 @@ UnboundedQueueExecutor::UnboundedQueueExecutor(
     std::shared_ptr<folly::ManualExecutor> executor)
     : executor_{std::move(executor)} {}
 
+size_t UnboundedQueueExecutor::getTaskQueueSize() const {
+  if (auto ex =
+          std::dynamic_pointer_cast<folly::CPUThreadPoolExecutor>(executor_)) {
+    return ex->getTaskQueueSize();
+  }
+  // manual executor does not expose a way to count the number of pending
+  // tasks.
+  return 0;
+}
+
 } // namespace facebook::eden
diff --git a/eden/common/utils/UnboundedQueueExecutor.h b/eden/common/utils/UnboundedQueueExecutor.h
index c1ac3f6b..d1c1b5db 100644
--- a/eden/common/utils/UnboundedQueueExecutor.h
+++ b/eden/common/utils/UnboundedQueueExecutor.h
@@ -50,6 +50,8 @@ class UnboundedQueueExecutor : public folly::Executor {
     executor_->add(std::move(func));
   }
 
+  size_t getTaskQueueSize() const;
+
  private:
   std::shared_ptr<folly::Executor> executor_;
 };