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From Julian Hyde <jul...@hydromatic.net>
Subject Re: [DISCUSS] JDK7
Date Wed, 18 Feb 2015 18:25:57 GMT
Another data point. Calcite just dropped support for JDK 1.6. Calcite 1.0 supports 1.6, 1.7,
1.8, but Calcite 1.1 will only support 1.7, 1.8. We could be persuaded to reconsider. 

Julian 

> On Feb 18, 2015, at 09:40, Chris Riccomini <criccomini@apache.org> wrote:
> 
> Hey all,
> 
> Ruslan has been working on upgrading Samza to the latest RocksDB build.
> 
>  https://issues.apache.org/jira/browse/SAMZA-442
> 
> During this migration, we realized that upgrading Samza to a modern version
> of RocksDB will require JDK 7, since RocksDB requires it to build. Without
> this upgrade, we will not be able to take in TTL support in RocksDB, as
> well as any new features they release.
> 
> Hadoop 2.7 (YARN) will also begin a vote in several weeks. This version
> mandates JDK7 be used at compile time:
> 
>  https://issues.apache.org/jira/browse/HADOOP-10530
> 
> Scala 2.11 requires JDK7+ transitively for us, since Scalatra 2.3 is built
> against JDK 7.
> 
>  https://issues.apache.org/jira/browse/SAMZA-469
> 
> We also discussed migrating to JDK 7 here:
> 
>  https://issues.apache.org/jira/browse/SAMZA-455
> 
> And here:
> 
> 
> http://mail-archives.apache.org/mod_mbox/incubator-samza-dev/201412.mbox/%3CD0AC655A.38469%25criccomini@linkedin.com%3E
> 
> Taken in isolation, each one of these is potentially fixable. We could try
> and convince the RocksDB community to move back to JDK 6. We could punt on
> upgrading YARN for a year or more. The same goes for Scala 2.11. This
> doesn't seem ideal, and it's just going to get worse.
> 
> I propose that we keep 0.9.0 on JDK6 and require JDK7 for 0.10.0. We can
> target an 0.9.0 release for March, and an 0.10.0 release for June. If we
> move to a more aggressive release schedule (e.g. monthly), then we'll
> require the JDK7 migration at the June release (but no earlier).
> 
> Cheers,
> Chris

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