+1 for lambda expressions On Thu, Jun 16, 2016 at 5:13 PM, Grant Henke <ghe...@cloudera.com> wrote:
> I definitely think its time, but I am not sure if 0.10.1.0 is the release > version to drop support in. > > Would it make sense to drop Java 1.7 and Scala 2.10 support in Kafka 0.11 > to maintain upgrade compatibility throughout the 0.10.x series? > > As a side note, I personally like the pattern of always supporting 2 java > and 2 Scala versions for any given release because it give the user a way > to upgrade one or the other independently. This creates a relatively > "static" testing matrix as well. > > > > > > On Thu, Jun 16, 2016 at 3:59 PM, Adam Kunicki <a...@streamsets.com> wrote: > > > +1 > > > > Adam Kunicki > > StreamSets | Field Engineer > > mobile: 415.890.DATA (3282) | linkedin > > < > > > https://mailtrack.io/trace/link/3e560367e0508b2f285512f39bd070275e70f571?url=http%3A%2F%2Fwww.adamkunicki.com&signature=aabcc9d816de2753 > > > > > > > On Thu, Jun 16, 2016 at 1:56 PM, Craig Swift < > > craig.sw...@returnpath.com.invalid> wrote: > > > > > +1 > > > > > > Craig J. Swift > > > Principal Software Engineer - Data Pipeline > > > ReturnPath Inc. > > > Work: 303-999-3220 Cell: 720-560-7038 > > > > > > On Thu, Jun 16, 2016 at 2:50 PM, Henry Cai <h...@pinterest.com.invalid > > > > > wrote: > > > > > > > +1 for Lambda expression. > > > > > > > > On Thu, Jun 16, 2016 at 1:48 PM, Rajiv Kurian <ra...@signalfx.com> > > > wrote: > > > > > > > > > +1 > > > > > > > > > > On Thu, Jun 16, 2016 at 1:45 PM, Ismael Juma <ism...@juma.me.uk> > > > wrote: > > > > > > > > > > > Hi all, > > > > > > > > > > > > I would like to start a discussion on making Java 8 a minimum > > > > requirement > > > > > > for Kafka's next feature release (let's say Kafka 0.10.1.0 for > > now). > > > > This > > > > > > is the first discussion on the topic so the idea is to understand > > how > > > > > > people feel about it. If people feel it's too soon, then we can > > pick > > > up > > > > > the > > > > > > conversation again after Kafka 0.10.1.0. If the feedback is > mostly > > > > > > positive, I will start a vote thread. > > > > > > > > > > > > Let's start with some dates. Java 7 hasn't received public > updates > > > > since > > > > > > April 2015[1], Java 8 was released in March 2014[2] and Java 9 is > > > > > scheduled > > > > > > to be released in March 2017[3]. > > > > > > > > > > > > The first argument for dropping support for Java 7 is that the > last > > > > > public > > > > > > release by Oracle contains a large number of known security > > > > > > vulnerabilities. The effectiveness of Kafka's security features > is > > > > > reduced > > > > > > if the underlying runtime is not itself secure. > > > > > > > > > > > > The second argument for moving to Java 8 is that it adds a number > > of > > > > > > compelling features: > > > > > > > > > > > > * Lambda expressions and method references (particularly useful > for > > > the > > > > > > Kafka Streams DSL) > > > > > > * Default methods (very useful for maintaining compatibility when > > > > adding > > > > > > methods to interfaces) > > > > > > * java.util.stream (helpful for making collection transformations > > > more > > > > > > concise) > > > > > > * Lots of improvements to java.util.concurrent > (CompletableFuture, > > > > > > DoubleAdder, DoubleAccumulator, StampedLock, LongAdder, > > > > LongAccumulator) > > > > > > * Other nice things: SplittableRandom, Optional (and many others > I > > > have > > > > > not > > > > > > mentioned) > > > > > > > > > > > > The third argument is that it will simplify our testing matrix, > we > > > > won't > > > > > > have to test with Java 7 any longer (this is particularly useful > > for > > > > > system > > > > > > tests that take hours to run). It will also make it easier to > > support > > > > > Scala > > > > > > 2.12, which requires Java 8. > > > > > > > > > > > > The fourth argument is that many other open-source projects have > > > taken > > > > > the > > > > > > leap already. Examples are Cassandra[4], Lucene[5], Akka[6], > Hadoop > > > > 3[7], > > > > > > Jetty[8], Eclipse[9], IntelliJ[10] and many others[11]. Even > > Android > > > > will > > > > > > support Java 8 in the next version (although it will take a while > > > > before > > > > > > most phones will use that version sadly). This reduces (but does > > not > > > > > > eliminate) the chance that we would be the first project that > would > > > > > cause a > > > > > > user to consider a Java upgrade. > > > > > > > > > > > > The main argument for not making the change is that a reasonable > > > number > > > > > of > > > > > > users may still be using Java 7 by the time Kafka 0.10.1.0 is > > > released. > > > > > > More specifically, we care about the subset who would be able to > > > > upgrade > > > > > to > > > > > > Kafka 0.10.1.0, but would not be able to upgrade the Java > version. > > It > > > > > would > > > > > > be great if we could quantify this in some way. > > > > > > > > > > > > What do you think? > > > > > > > > > > > > Ismael > > > > > > > > > > > > [1] https://java.com/en/download/faq/java_7.xml > > > > > > [2] > > > https://blogs.oracle.com/thejavatutorials/entry/jdk_8_is_released > > > > > > [3] http://openjdk.java.net/projects/jdk9/ > > > > > > [4] https://github.com/apache/cassandra/blob/trunk/README.asc > > > > > > [5] > > > > https://lucene.apache.org/#highlights-of-this-lucene-release-include > > > > > > [6] http://akka.io/news/2015/09/30/akka-2.4.0-released.html > > > > > > [7] https://issues.apache.org/jira/browse/HADOOP-11858 > > > > > > [8] https://webtide.com/jetty-9-3-features/ > > > > > > [9] http://markmail.org/message/l7s276y3xkga2eqf > > > > > > [10] > > > > > > > > > > > > > > > > > > > > > > > > > > > https://intellij-support.jetbrains.com/hc/en-us/articles/206544879-Selecting-the-JDK-version-the-IDE-will-run-under > > > > > > [11] http://markmail.org/message/l7s276y3xkga2eqf > > > > > > > > > > > > > > > > > > > > > > > > -- > Grant Henke > Software Engineer | Cloudera > gr...@cloudera.com | twitter.com/gchenke | linkedin.com/in/granthenke >
