[fix] [ml] The atomicity of multiple fields of ml is broken (apache#19346)

Author: poorbarcode

managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java

@@ -1554,16 +1554,16 @@ public void operationComplete(Void v, Stat stat) {
                         log.debug("[{}] Updating of ledgers list after create complete. version={}", name, stat);
                     }
                     ledgersStat = stat;
-                    ledgers.put(lh.getId(), newLedger);
-                    currentLedger = lh;
-                    currentLedgerEntries = 0;
-                    currentLedgerSize = 0;
-                    metadataMutex.unlock();
-                    updateLedgersIdsComplete();
                     synchronized (ManagedLedgerImpl.this) {
+                        ledgers.put(lh.getId(), newLedger);
+                        currentLedger = lh;
+                        currentLedgerEntries = 0;
+                        currentLedgerSize = 0;
+                        updateLedgersIdsComplete();
                         mbean.addLedgerSwitchLatencySample(System.currentTimeMillis()
                                 - lastLedgerCreationInitiationTimestamp, TimeUnit.MILLISECONDS);
                     }
+                    metadataMutex.unlock();
 
                     // May need to update the cursor position
                     maybeUpdateCursorBeforeTrimmingConsumedLedger();