private void checkPoint() throws IOException {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("checkpoint start");
}
// 先将内容都强制刷到磁盘,因为后面会写头部汇总信息
if (fileLength != lastCheckPointLength) {
fileChannel.force(true);
lastCheckPointLength = fileLength;
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("checkpoint end: fileLength=" + fileLength);
}
}
