Per the instructions of impala [1], I have been stepping through the release process. Every time there is a release there can be multiple release candidates. We vote on /dev as to whether we agree that we agree this is worthy of a release.
So, if you please, try testing out the release candidate by pulling the SVN repo, and building quickstep fresh, plus testing the hashes + signature. There are instructions on how to do all of this on [1], just substitute impala with quickstep. We're on step 15. You can start with svn co https://dist.apache.org/repos/dist/dev/incubator/quickstep (Note, the sig should not work, I haven't added myself to KEYS, but I will in a minute here, please then don't vote +1 on this release candidate, we'll try another tomorrow.) [1] https://cwiki.apache.org/confluence/display/IMPALA/DRAFT%3A+How+to+Release