From fd45495cf54eeb7df3ee7d06487091f2b98c6c3f Mon Sep 17 00:00:00 2001
From: Siying Dong <siying.d@fb.com>
Date: Thu, 26 Jul 2018 11:03:44 -0700
Subject: [PATCH] DBImpl::IngestExternalFile() should grab mutex when releasing
 file number in failure case (#4189)

Summary:
995fcf757319da9cf12eca2df83a6fba4db0ebe4 has a bug: ReleaseFileNumberFromPendingOutputs() added is not protected by the DB mutex. Fix it by grabbing the lock for this operation.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4189

Differential Revision: D9015447

Pulled By: siying

fbshipit-source-id: b8506e09a96c3f95a6fe32b5ca5fcdb9bee88937
---
 db/db_impl.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/db/db_impl.cc b/db/db_impl.cc
index 23f990c41..0088ee56d 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -2912,6 +2912,7 @@ Status DBImpl::IngestExternalFile(
   status = ingestion_job.Prepare(external_files, super_version);
   CleanupSuperVersion(super_version);
   if (!status.ok()) {
+    InstrumentedMutexLock l(&mutex_);
     ReleaseFileNumberFromPendingOutputs(pending_output_elem);
     return status;
   }