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xlog回写时关闭进程可能会丢日志 #1328

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ircc opened this issue Feb 12, 2025 · 0 comments

ircc commented Feb 12, 2025 •

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对应代码：

mars/mars/xlog/src/log_base_buffer.cc

Line 259 in db98964

void LogBaseBuffer::Flush(AutoBuffer& _buff) {
mars/mars/xlog/src/appender.cc

Line 938 in db98964

void XloggerAppender::__AsyncLogThread() {

从代码看，xlog回写日志逻辑：

先从mmap读到内存（Flush）
然后清空mmap（Flush->__Clear）
再写到xlog日志文件中（__Log2File）

在进行到第3步时实际数据只在内存中有，而且__Log2File内是有锁的，如果在等待过程中进程crash或者被杀掉了，日志就会丢失

mars/mars/xlog/src/appender.cc

Line 853 in db98964

    
           void XloggerAppender::__Log2File(const void* _data, size_t _len, bool _move_file) {

ircc changed the title ~~xlog回写时结进程可能会丢日志~~ xlog回写时关闭进程可能会丢日志

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