default void setWriteBufferPeriodicFlush(long timeoutMs) {
    setWriteBufferPeriodicFlush(timeoutMs, 1000L);
  }
Sets the maximum time before the buffer is automatically flushed checking once per second.
@param timeoutMs The maximum number of milliseconds how long records may be buffered before
                 they are flushed. Set to 0 to disable.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/BufferedMutator.java