Apache Apex Core 3.3.0-incubating 发布

Apache Apex Core 3.3.0 发布，该版本目前还是在 Apache 基金会的孵化阶段。

Apache Apex 是一个企业级的统一流和批处理引擎。提供高度可伸缩、高性能、容错、有状态、安全和分布式的大数据处理，同时操作起来非常简单容易。

新版本改进记录包括：

[APEXCORE-104] – Expand Module DAG
[APEXCORE-105] – Support injecting properties through xml file on modules.
[APEXCORE-144] – Provide REST api for listing information about module.
[APEXCORE-151] – Provide code style templates for major IDEs (Eclipse, IntelliJ and NetBeans)
[APEXCORE-182] – Add Apache copyright to IntelliJ
[APEXCORE-194] – Add support for ProxyPorts in Modules
[APEXCORE-226] – Strictly enforce wrapping indentation in checkstyle
[APEXCORE-227] – Enforce left brace placement for anonymous class on the next line
[APEXCORE-230] – Limit line lengths to be 120
[APEXCORE-239] – Upgrade checkstyle to 6.12 from 6.11.2
[APEXCORE-248] – Increase wrapping indentation from 2 to 4.
[APEXCORE-249] – Enforce class, method, constructor annotations on a separate line
[APEXCORE-250] – Exclude DtCli from System.out checks
[APEXCORE-267] – Fix existing checkstyle violations in api
[APEXCORE-270] – Enforce checkstyle validations on test classes
[APEXCORE-272] – Attributes added to operator inside Module is not preserved.
[APEXCORE-273] – Fix existing checkstyle violations in bufferserver module
[APEXCORE-306] – Recovery checkpoint handing in iteration loops

[APEXCORE-58] – endWindow is being called even when the operator is being undeployed
[APEXCORE-83] – beginWindow not called on recovery
[APEXCORE-193] – apex-app-archetype has extraneous entry that generates a warning when running it
[APEXCORE-204] – Update checkstyle and codestyle to be the same
[APEXCORE-211] – Brace placement after static blocks in checkstyle configuration
[APEXCORE-263] – Checkpoint can be performed twice for same window
[APEXCORE-274] – removeTerminatedPartition fails for Unifier operator
[APEXCORE-275] – Two threads can try to reconnect to websocket server upon disconnection
[APEXCORE-278] – GenericNodeTest clutters test logs with unnecessary statement
[APEXCORE-296] – Memory leak in operator stats processing
[APEXCORE-300] – Fix checkstyle regular expression
[APEXCORE-303] – Launch properties not evaluated

[APEXCORE-40] – Semver dependencies should be in Maven Central
[APEXCORE-162] – Enhance StramTestSupport.TestMeta API
[APEXCORE-181] – Expose methods in StramWSFilterInitializer to get the RM webapp address
[APEXCORE-188] – Make type graph lazy load
[APEXCORE-199] – CLI should check for version compatibility when launching app package
[APEXCORE-228] – Add maven 3.0.5 as prerequisites to the Apex parent pom
[APEXCORE-229] – Upgrade checkstyle maven plugin (2.17) and checkstyle dependency (6.11.2)
[APEXCORE-291] – Provide a way for an operator to specify its metric aggregator instance
[APEXCORE-305] – Enable checkstyle violations logging to console during maven build

[APEXCORE-24] – Takes out usage of Rhino as it is GPL 2.0
[APEXCORE-186] – Enable license check in Travis CI
[APEXCORE-253] – Apex archetype includes dependencies which do not belong to org.apache.apex
[APEXCORE-298] – Reduce the severity of line length check
[APEXCORE-301] – Add “io” as a separate import to checkstyle rules
[APEXCORE-302] – Update NOTICE copyright year
[APEXCORE-308] – Implement findbugs plugin reporting
[APEXCORE-317] – Run performance benchmark for the Apex Core 3.3.0 release