1 files changed, 40 insertions, 0 deletions
diff --git a/jstests/sharding/movechunk_commit_changelog_stats.js b/jstests/sharding/movechunk_commit_changelog_stats.js
new file mode 100644
index 00000000000..cff5ae2a445
--- /dev/null
+++ b/jstests/sharding/movechunk_commit_changelog_stats.js
@@ -0,0 +1,40 @@
+//
+// Tests that the changelog entry for moveChunk.commit contains stats on the migration.
+//
+
+(function() {
+    'use strict';
+
+    var st = new ShardingTest({mongos: 1, shards: 2});
+    var kDbName = 'db';
+
+    var mongos = st.s0;
+    var shard0 = st.shard0.shardName;
+    var shard1 = st.shard1.shardName;
+
+    assert.commandWorked(mongos.adminCommand({enableSharding: kDbName}));
+    st.ensurePrimaryShard(kDbName, shard0);
+
+    function assertCountsInChangelog() {
+        let changeLog = st.s.getDB('config').changelog.find({what: 'moveChunk.commit'}).toArray();
+        assert.gt(changeLog.length, 0);
+        for (let i = 0; i < changeLog.length; i++) {
+            assert(changeLog[i].details.hasOwnProperty('counts'));
+        }
+    }
+
+    var ns = kDbName + '.fooHashed';
+    assert.commandWorked(mongos.adminCommand({shardCollection: ns, key: {_id: 'hashed'}}));
+
+    var aChunk = mongos.getDB('config').chunks.findOne({_id: RegExp(ns), shard: shard0});
+    assert(aChunk);
+
+    // Assert counts field exists in the changelog entry for moveChunk.commit
+    assert.commandWorked(
+        mongos.adminCommand({moveChunk: ns, bounds: [aChunk.min, aChunk.max], to: shard1}));
+    assertCountsInChangelog();
+
+    mongos.getDB(kDbName).fooHashed.drop();
+
+    st.stop();
+})();
+\ No newline at end of file