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From Andrew Purtell <andrew.purt...@gmail.com>
Subject Re: [DISCUSS] Drop the support of jdk7 at a future 1.x release
Date Fri, 09 Sep 2016 03:56:11 GMT
I think we should wait until 2.0 before dropping support for less than JDK 8. That's a pretty
big deal. But, for 2.0, that would be fine IMHO. 

> On Sep 8, 2016, at 8:54 PM, Duo Zhang <zhangduo@apache.org> wrote:
> 
> The main reason is the asynchronous api we want to introduce in HBase
> today. See HBASE-13784 and HBASE-16505.
> 
> The CompletableFuture in java8 is very suitable to use as the return value
> of a async method. We can not use it if we still want to support java7, and
> sadly, there is no candidate which is good enough to replace
> CompletableFuture. ListenableFuture in guava or Promise in netty are good,
> but we do not want to expose third-party classes in our public
> API(especially guava, you know...). And we can also implement our own
> ListenableFuture but it just a copy of guava. Or introduce a simple
> Callback interface which does not need much code(for us) but this is a code
> style around 2000s so people will not like it...
> 
> And luckily, I found that in our documentation
> 
> http://hbase.apache.org/book.html#basic.prerequisites
> 
> We only say that 1.3 will be compatible with jdk7, not all 1.x.
> 
> So here I propose that we drop the support of jdk7 in a future 1.x release,
> maybe 1.4? Thus we can use CompletableFuture in both master and branch-1.
> 
> Thanks.

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