mxm commented on issue #10238: [FLINK-8949] Allow configuration of maximum Rest HTTP header length URL: https://github.com/apache/flink/pull/10238#issuecomment-555934991 I just checked, the buffer for reading the header is already dynamic. It is just that the code enforces a maximum line length / header length. So a quick fix could be to just to raise these limits, without exposing it as a config option. Adding a watermark REST handler is probably more elegant, especially given that we currently always send a list of all sub tasks, which is just redundant.
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