public static void truncate() {
        final StringBuilderHolder holder = holderThreadLocal.get();
        holder.truncate();
    }
Reuse {@link StringBuilder} based on {@link ThreadLocal}.

Be careful that do not to nest in the same thread.

@author jiachun.fjc
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/util/StringBuilderHelper.java