xvrl commented on PR #12032:
URL: https://github.com/apache/druid/pull/12032#issuecomment-1251607235

   @liam-verta I think we're pretty close – barring merging changes from master 
– but one thing we're trying to understand is the change in memory 
requirements. It seems they are significantly higher with Netty 4. I was able 
to get the the failing query tests to pass by using 
`-Dio.netty.allocator.type=unpooled`. So far I have not seen any evidence of a 
leak: using `-Dio.netty.leakDetection.level=paranoid` doesn't seem to turn up 
anything so far. So it is possible the netty memory pooling algorithm requires 
significantly more memory, but I would like to make sure we understand why.


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