@Override
  public String toString() {
    return "WALEntryBatch [walEntries=" + walEntriesWithSize + ", lastWalPath=" + lastWalPath
      + ", lastWalPosition=" + lastWalPosition + ", nbRowKeys=" + nbRowKeys + ", nbHFiles="
      + nbHFiles + ", heapSize=" + heapSize + ", lastSeqIds=" + lastSeqIds + ", endOfFile="
      + endOfFile + ",usedBufferSize=" + usedBufferSize + "]";
  }
Returns the last sequenceid for each region if the table has serial-replication scope
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/WALEntryBatch.java