SERVER-8255 warn and abort if starting from-side zero-version migration

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mongo/s/d_migrate.cpp b/src/mongo/s/d_migrate.cpp
index fc03bdc6884..4cd98e65791 100644
--- a/src/mongo/s/d_migrate.cpp
+++ b/src/mongo/s/d_migrate.cpp
@@ -988,6 +988,12 @@ namespace mongo {
                 startingVersion = maxVersion;
                 shardingState.trySetVersion( ns , startingVersion /* will return updated */ );
 
+                if (startingVersion.majorVersion() == 0) {
+                   // It makes no sense to migrate if our version is zero and we have no chunks, so return
+                   warning() << "moveChunk cannot start migration with zero version" << endl;
+                   return false;
+                }
+
                 log() << "moveChunk request accepted at version " << startingVersion << migrateLog;
             }