public MultiVersionConcurrencyControl.WriteEntry getWriteEntry() {
    return this.writeEntry;
  }
Use it to complete mvcc transaction. This WALKeyImpl was part of (the transaction is started
when you call append; see the comment on FSHLog#append). To complete call
{@link MultiVersionConcurrencyControl#complete(MultiVersionConcurrencyControl.WriteEntry)} or
{@link MultiVersionConcurrencyControl#complete(MultiVersionConcurrencyControl.WriteEntry)}
@return A WriteEntry gotten from local WAL subsystem.
@see #setWriteEntry(MultiVersionConcurrencyControl.WriteEntry)
hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALKeyImpl.java