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：
Sub-task
[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
Bug
[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
Improvement
[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
New Feature
[APEXCORE-3] - Ability for an operator to populate DAG at launch time
[APEXCORE-60] - Iterative processing support
[APEXCORE-78] - Pre-Checkpoint Operator Callback
[APEXCORE-276] - Make App Data Push transport pluggable and configurable
[APEXCORE-283] - Operator checkpointing in distributed in-memory store
[APEXCORE-288] - Add group id information to apex app package
Task
[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
下载地址：http://apex.incubator.apache.org/downloads.html
来自:开源中国社区
