Github user nsuke commented on the pull request: https://github.com/apache/thrift/pull/733#issuecomment-166066840 #732 is already in master so the point is to push this to 0.9.3 branch ? IMO it's reasonable in this case to have one more commit in 0.9.3 **branch** than 0.9.3 **tag**. As to implementation, `apt-get update`, `apt-get install` and the last cleaning step should not be separate `RUN`s to avoid fat intermediate layers and also we typically want to avoid `apt-get upgrade` and leave it to debian image maintainers. See https://docs.docker.com/engine/articles/dockerfile_best-practices/ and [current "offical" thrift dockerhub image](https://github.com/ahawkins/docker-thrift/blob/61c3478ab828d3e610f192b442ac2a7221749c47/0.9/Dockerfile) for more detail. BTW we may want to take ownership of the docker hub [official image](https://hub.docker.com/_/thrift/). The procedure is described here: https://github.com/docker-library/official-images#maintainership
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