yes, the question here is, librbd use the committed callback, as my understanding, when this callback returned, librbd write will be looked as completed. So I can issue a read IO even if the data is not readable. In this case, i would like to know what data will be returned for the read IO?
2015-12-31 10:29 GMT+08:00 Dong Wu <archer.wudong@xxxxxxxxx>:
there are two callbacks: committed and applied, committed means write
to all replica's journal, applied means write to all replica's file
system. so when applied callback return to client, it means data can
be read.
> _______________________________________________
2015-12-31 10:15 GMT+08:00 min fang <louisfang2013@xxxxxxxxx>:
> Hi, as my understanding, write IO will committed data to journal firstly,
> then give a safe callback to ceph client. So it is possible that data still
> in journal when I send a read IO to the same area. So what data will be
> returned if the new data still in journal?
>
> Thanks.
>
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