SERVER-21387 bench_test_crud_commands.js: ensure collection exists

Fixes an issue where no write operations would be reported as
successful in the following scenario:
- The first write triggers a database creation.
- The time to pre-allocate data files exceeds the amount of time
  that the bench worker is running.

1 files changed, 2 insertions, 0 deletions

diff --git a/jstests/core/bench_test_crud_commands.js b/jstests/core/bench_test_crud_commands.js
index 6b6cafc00cc..7f2ae819086 100644
--- a/jstests/core/bench_test_crud_commands.js
+++ b/jstests/core/bench_test_crud_commands.js
@@ -3,6 +3,8 @@
     "use strict";
 
     var coll = db.bench_test_crud_commands;
+    coll.drop();
+    assert.commandWorked(coll.getDB().createCollection(coll.getName()));
 
     function executeBenchRun(benchOps) {
         var benchArgs = {ops: benchOps, parallel: 2, seconds: 1, host: db.getMongo().host};