On 09/10/2013 11:42 AM, Nate McCall wrote:
With SSDs, you can turn up memtable_flush_writers - try 3 initially (1
by default) and see what happens. However, given that there are no
entries in 'All time blocked' for such, they may be something else.
Tried that, it seems to have reduced the loads a little after everything
warmed-up, but not much.
How are you inserting the data?
A java client on a separate box using the datastax java driver, 48
threads writing 100 records each iteration as prepared batch statements.
At 5000 records/sec, the servers just can't keep up, so the client backs
up. That's only 5M of data/sec, which doesn't seem like much. As I
mentioned, switching to SSDs didn't help much, so I'm assuming at this
point that the server overloads are what's holding up the client.
