Re: Errors during 'Initial Load' on NDB cluster

[Mikael Ronström]

Starting up 10000 threads in parallel issuing requests to 2 MySQL Servers
are very likely to cause issues. The commercial version of MySQL Cluster
has a thread pool service to handle things like this.

However it is rarely a good idea to have 10000 threads hitting at a
single database service. It is bound to lead to timeouts and other types
of resource errors.

So some sort of control of the parallelism sounds like a good idea. In
benchmarks one can see that up to around 500 concurrent threads works
fairly ok, after that the throughput drops with increasing number of
concurrent connections.