Hi, I m running flink 1.9 on EMR using flink sql blink planner reading and writing to JDBC input/output. my sql is just a listagg over window for the last 7 days. However, i notice that there are one or two subtasks that take too long to finish. In this thread http://mail-archives.apache.org/mod_mbox/flink-user/201901.mbox/%3CCAEv5b0yD+0WBXgAnfT0b=ZqLC8rPE9_izzE3g+9Vxw8oK9w2=a...@mail.gmail.com%3E, that is a similar issue.
Any idea on how to debug this? Thanks Fanbin
