@Override
    public String toString() {
      return new StringBuilder().append("flush result:").append(result).append(", ")
        .append("failureReason:").append(failureReason).append(",").append("flush seq id")
        .append(flushSequenceId).toString();
    }
Convenience method, the equivalent of checking if result is FLUSHED_COMPACTION_NEEDED.
@return True if the flush requested a compaction, else false (doesn't even mean it flushed).
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java