morningman commented on issue #3859: URL: https://github.com/apache/incubator-doris/issues/3859#issuecomment-644705585
> 2\. For `publish timeout`, I think we should improve publish version performance. Yes, publish timeout is the root cause of this problem. This part needs continuous optimization > 3\. I think we could add a MVVC GC mechanism like other database system. If there is still a serious timeout problem, the MVCC mechanism cannot fundamentally solve this problem. Because we still face the problem of how to set the appropriate `unused_rowset_gc_window_seconds` value. If timeout is delayed by 10 minutes, then `unused_rowset_gc_window_seconds` must be set to greater than 10 minutes. However, MVCC can solve the problem of poor reading performance due to the accumulation of data versions during the delay. In summary, `latest read version` is just a temporary solution that can alleviate the problem. And in most cases there should be no problems. In fact, @chaoyli has written a function that supports multi-path lookup of version graph, maybe we can implement a complete MVCC logic on this basis. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
