private void ensureLearnersIsMutable() {
                if (!((bitField0_ & 0x00000040) == 0x00000040)) {
                    learners_ = new com.google.protobuf.LazyStringArrayList(learners_);
                    bitField0_ |= 0x00000040;
                }
            }
<pre>
Checksum fot this log entry, since 1.2.6, added by boyan&#64;antfin.com
</pre>

<code>optional int64 checksum = 6;</code>
jraft-core/src/main/java/com/alipay/sofa/jraft/entity/RaftOutter.java