Have you tried using the same collector in the thread and the bolt? On Jul 24, 2015 4:20 PM, "Hong Jeon" <hj...@cornell.edu> wrote:
> Hi, > > Lets say I have a Bolt that spawns a separate thread in it that handles > all of the emits and acks. This has worked without errors (I assume since > emits and acks are still on one thread) but, I began seeing a > NullPointerException ever since I started using a MetricsConsumer. I am > thinking that the daemon for sending out built in metrics is also using > emits on the same OutputCollector, and since my emits are coming from a > custom thread (and not the Bolt itself), there is some synchronization > issues going on. > > Do you guys think this is a likely cause of the NullPointerException? > And if so, does that mean we can only emit from the Bolt itself when using > MetricsConsumer? > > Help is much appreciated. Thanks in advance. > > Best, > Hong Jeon >
