@VisibleForTesting
    String getActiveTxPath(final int epoch, final String txId) {
        return ZKPaths.makePath(ZKPaths.makePath(activeTxRoot, Integer.toString(epoch)), txId);
    }
@ VisibleForTesting String getActiveTxPath ( final int epoch , final String txId ) { return ZKPaths . makePath ( ZKPaths . makePath ( activeTxRoot , Integer . toString ( epoch ) ) , txId ) ; }
region private helpers