yaooqinn commented on PR #52791:
URL: https://github.com/apache/spark/pull/52791#issuecomment-3483463141
Thank you @dongjoon-hyun @holdenk
After doing some research, I found that Netty's `IO_URING` only supports
`DefaultFileRegion` and `ByteBuf` as message types, while in Spark, we have
plenty of customized `FileRegion` implementations. In this case, `IO_URING`
might not be a feasible option yet.
```
Caused by: java.lang.UnsupportedOperationException: unsupported message type
at
io.netty.channel.uring.AbstractIoUringChannel.filterOutboundMessage(AbstractIoUringChannel.java:1206)
at
io.netty.channel.uring.AbstractIoUringStreamChannel.filterOutboundMessage(AbstractIoUringStreamChannel.java:231)
at
io.netty.channel.AbstractChannel$AbstractUnsafe.write(AbstractChannel.java:739)
... 20 more
```
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