I have a job where I read data from Kafka, do some processing on it, and write it to a database. When I read data out of Kafka, I put it into an object that has a String field based on the Kafka message key. The possible values for the message key are tightly constrained so there are fewer than 100 possible unique key values. Profiling of the Flink job shows millions of in flight stream elements, with an equal number of Strings, but I know all the strings are duplicates of a small number of unique values. So it's an ideal usecase for String interning. I've tried to use interning in the constructors for the message elements, but I suspect that I need to do something to preserve the interning when Flink serializes/deserializes objects when passing them between operators. What's the best way to accomplish that?
------------------------------------------------------------------------------ Notice: This e-mail is intended solely for use of the individual or entity to which it is addressed and may contain information that is proprietary, privileged and/or exempt from disclosure under applicable law. If the reader is not the intended recipient or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. This communication may also contain data subject to U.S. export laws. If so, data subject to the International Traffic in Arms Regulation cannot be disseminated, distributed, transferred, or copied, whether incorporated or in its original form, to foreign nationals residing in the U.S. or abroad, absent the express prior approval of the U.S. Department of State. Data subject to the Export Administration Act may not be disseminated, distributed, transferred or copied contrary to U. S. Department of Commerce regulations. If you have received this communication in error, please notify the sender by reply e-mail and destroy the e-mail message and any physical copies made of the communication. Thank you. *********************
