Thanks, Amol – that makes sense and was the solution I’d arrived at. I just was trying to avoid the delay between the data being ready and emitting it. Has anyone built a solution where it emits from the parent as soon as it’s ready in the child (assuming I don’t care about order).
- Ilya Ganelin On 4/10/17, 12:45 PM, "Amol Kekre" <a...@datatorrent.com> wrote: Ilya, This constraint was introduced as allowing two threads to emit data creates lots of bad situations 1. The emit is triggered between end_window and begin_window. This was a critical blocker 2. Order no longer guaranteed, upon replay getting wrong order of events within a window. This was something to worry about, but not a blocker We had users report this problem. The solution is to pass the data to main thread and have the main thread emit this data during one of start-window, process, end-window calls. Ideally during start-window or end-window so as to guarantee order. Keeping this code in start or end window also ensures that process call remains optimal. Thks Amol E:a...@datatorrent.com | M: 510-449-2606 | Twitter: @*amolhkekre* www.datatorrent.com On Mon, Apr 10, 2017 at 12:39 PM, Ganelin, Ilya <ilya.gane...@capitalone.com > wrote: > Hello – I’ve got an operator that runs a cleanup thread (separate from the > main event loop) and triggers a callback when an item is removed from an > internal data structure. I would like for this callback to emit data from > one of the operator’s ports, but I run into the following Exception: > > > > (From DefaultOutputPort.java, line 58) > > if (operatorThread != null && Thread.*currentThread*() != operatorThread) > { > // only under certain modes: enforce this > throw new IllegalStateException("Current thread " + Thread. > *currentThread*().getName() + > " is different from the operator thread " + > operatorThread.getName()); > } > > > > I could obviously extend DefaultOperatorPort to bypass this but I’d like > to understand why that constraint is there and if there’s a good way to > work around it. > > > > Would love to hear the community’s thoughts. Thanks! > > > > - Ilya Ganelin > > [image: id:image001.png@01D1F7A4.F3D42980] > > ------------------------------ > > The information contained in this e-mail is confidential and/or > proprietary to Capital One and/or its affiliates and may only be used > solely in performance of work or services for Capital One. The information > transmitted herewith is intended only for use by the individual or entity > to which it is addressed. If the reader of this message is not the intended > recipient, you are hereby notified that any review, retransmission, > dissemination, distribution, copying or other use of, or taking of any > action in reliance upon this information is strictly prohibited. If you > have received this communication in error, please contact the sender and > delete the material from your computer. > ________________________________________________________ The information contained in this e-mail is confidential and/or proprietary to Capital One and/or its affiliates and may only be used solely in performance of work or services for Capital One. The information transmitted herewith is intended only for use by the individual or entity to which it is addressed. If the reader of this message is not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying or other use of, or taking of any action in reliance upon this information is strictly prohibited. If you have received this communication in error, please contact the sender and delete the material from your computer.