sschepens opened a new pull request #1056: DoubleByteBuf fix for Netty > 4.1.12 URL: https://github.com/apache/incubator-pulsar/pull/1056 It seems `DoubleByteBuf` is not playing well when used with Native Transports. Using @merlimat [test](https://gist.github.com/merlimat/799b8ba84b5987de369668a748aa0e32) I was able to reproduce this. Switching from Epoll to Nio transport fixes the issue, so this has to be something with native transports. Also, changing [this line](https://github.com/apache/incubator-pulsar/blob/master/pulsar-common/src/main/java/org/apache/pulsar/common/api/DoubleByteBuf.java#L386) to `allocateDirect` fixes the issue for both Epoll and Nio, but I don't know if it's the right thing to do. The most simple fix is not try to allocate a new `ByteBuffer` but return a concatenation of the components' nio buffers. Therefore, I propose making `DoubleByteBuf.nioBuffers` return a concatenation of the two components' `nioBuffers` when index and length are not needed, this could prove be more efficient. Also make `nioBuffer` allocate a direct buffer if both components are direct, i believe this should be safe also.
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