Priority: Major - P3
Affects Version/s: None
Fix Version/s: WT2.8.0
I'm opening wiredtiger with the described setting above. I'm aware of the consequences: In a power-off scenario my database is corrupted or not usable anymore, but in my case this is acceptable (strong replication).
Still I can see on each checkpoint interval (60 seconds):
heavy disk usage
decreased throughput in my application
I looked a bit through the wiredtiger code and found out that this line of code is the culprit:
I would consider this as a bug, this setting says "Please do not sync", but still the code does.
Another thing, the comment there says
Start a flush to stable storage, but don't wait for it
Which is not entirely true. If you look at the man-page it says that the call can block if there is already much disk IO happening.