A remaining issue with SQL is https://github.com/apache/incubator-druid/issues/6176
We've seen it happen several times in production on 0.12, where thankfully SQL doesn't power anything critical. The current workarounds are: 1. Restart the broker. Obviously not a good solution. 2. Migrate to HTTP segment discovery. I'm fine with that, and we are actually planning to do it soon in our clusters, but I'm still concerned about other Druid users—the default setting is still ZK, which means that SQL would still have this issue by default. Before marking SQL as non-experimental, I'd suggest either fixing the root cause, or making HTTP segment discovery the default and then explicitly deprecating ZK segment discovery. On Mon, Jan 14, 2019 at 2:18 PM Gian Merlino <g...@apache.org> wrote: > I'd like to propose graduating a couple of features out of 'experimental' > status in 0.14. Both are popular features (judging by mailing list & github > issue/PR activity). Both have been around for a while and have attained a > good level of quality and stability of API & behavior. I believe removing > the 'experimental' banner from these features would more accurately reflect > reality, and be a good signal to the user community. > > 1) Kafka indexing service. First introduced in Druid 0.9.1, it went through > a major protocol change in Druid 0.12.0 that added incremental publishing, > & 'mixing' of data from different partitions. Subjectively, quality appears > to be getting more solid, based on frequency of bug reports and also based > on our own experiences running this in production. Finally- I believe it is > already much more robust than Tranquility, the only 'stable' alternative. > > 2) Druid SQL. First introduced in Druid 0.10.0. It isn't feature complete > yet (multi-value dimensions, datasketches, etc, remain unsupported) but the > API and behavior have been generally stable. No major issues around memory > / performance / etc regressions relative to native Druid queries are > outstanding. IMO, it is well on its way to becoming a first class way to > query Druid, and it is a good time to remove the 'experimental' banner. >
