docs: @Override
      public CountDownLatch snapshotCompleted(SnapshotCompletionEvent event) {
          if (!event.truncationSnapshot || !event.didSucceed) {
              VoltDB.crashGlobalVoltDB("Failed to truncate command logs by snapshot",
                                       false, null);
          } else {
              m_truncationSnapshot = event.multipartTxnId;
              m_truncationSnapshotPerPartition = event.partitionTxnIds;
              m_replayAgent.returnAllSegments();
              changeState();
          }
          return new CountDownLatch(0);
      }