Disable rehash when redis has child process (#8007)

In redisFork(), we don't set child pid, so updateDictResizePolicy()
doesn't take effect, that isn't friendly for copy-on-write.

The bug was introduced this in redis 6.0: 56258c6

1 files changed, 2 insertions, 0 deletions

diff --git a/src/rdb.c b/src/rdb.c
index db5698c1d..3ea55fa67 100644
--- a/src/rdb.c
+++ b/src/rdb.c
@@ -1412,6 +1412,7 @@ int rdbSaveBackground(char *filename, rdbSaveInfo *rsi) {
         server.rdb_save_time_start = time(NULL);
         server.rdb_child_pid = childpid;
         server.rdb_child_type = RDB_CHILD_TYPE_DISK;
+        updateDictResizePolicy();
         return C_OK;
     }
     return C_OK; /* unreached */
@@ -2618,6 +2619,7 @@ int rdbSaveToSlavesSockets(rdbSaveInfo *rsi) {
             server.rdb_save_time_start = time(NULL);
             server.rdb_child_pid = childpid;
             server.rdb_child_type = RDB_CHILD_TYPE_SOCKET;
+            updateDictResizePolicy();
             close(rdb_pipe_write); /* close write in parent so that it can detect the close on the child. */
             if (aeCreateFileEvent(server.el, server.rdb_pipe_read, AE_READABLE, rdbPipeReadHandler,NULL) == AE_ERR) {
                 serverPanic("Unrecoverable error creating server.rdb_pipe_read file event.");