Apache Slider 0.81.1-incubating 发布
欢迎加入运维网交流群:263444886Apache Slider 0.81.1-incubating 发布，此版本现已提供下载：
http://www.apache.org/dyn/closer.cgi/incubator/slider/0.81.1-incubating/
Bug 修复
[*] - Fix description for destroy command in slider usage
[*] - Fix accumulo test failures
[*] - Move SLIDER_HOME assignment to slider.py
[*] - Slider cannot support jdk 1.8 for command slider registry --getconf hbase-site --name hb1
[*] - Remove app-package LICENSE.txt and NOTICE.txt file
[*] - Change branch-2.7 profile dependency version to 2.7.0
[*] - Rename command-logger appConfig and resources file names
[*] - Add ability to set Slider AM launch environment during cluster create/start
[*] - Slider Unit Test Cases Failing on Windows
[*] - ApplicationWithAddonPackagesIT fun test failing on Windows
[*] - AMClientCertStoreRetrievalIT#testRetrieveCertificateStores failing on Windows
[*] - Resource leak reported by coverity scan results
[*] - Container request fails when Slider requests container with node label and host constraints
[*] - x-insecure rest API should be off by default
[*] - Fix Docker related bugs
[*] - switch to TryOnceThenFail retry policy
[*] - Slider should not use multiple versions of jackson jars
[*] - Expose SliderClient methods to retrieve list of applications
[*] - Fix test_signal_handler failure
[*] - Security permissions on set up ZK path are too lax
[*] - changes in list Action broke return codes from `list` action
改进
[*] - coalesce use of assumeWindows/assumeNotWindows test assumptions
[*] - add Hadoop 2.7.1 profile, move branch-2 version to 2.8.0-SNAPSHOT
[*] - remove surplus jax rs jsr311-api JAR
新特性
[*] - Provide slider dependencies as a self contained versioned tarball
[*] - Making component configurations in appConfig available on the SliderAgent side
[*] - Bundle Solr as an app-package include with the Slider distribution
文档：http://slider.incubator.apache.org/docs/getting_started.html
详细发行说明请看：https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12315422&ve
rsion=12332386
Regards,
The Slider Team
Apache Slider 是一个 Yarn 应用，它可以用来在 Yarn 上部署并监控分布式应用。Slider 可以在应用运行期随意扩展或者收缩应用。目前它是 Apache 的孵化项目。
Yarn 上的应用在停止之后可以重新被启动，并且 Yarn 上的应用的分布是持久化的，重启之后的位置会尽量接近之前的位置，借助该特性，应用可以记住数据存放位置，所以启动时间也会加快。
Yarn可以监控“Yarn容器”的健康状态，当容器挂掉时，它会通知Slider。同时，Slider会请求Yarn创建一个新容器，Slider会创建一个失败容器的替代组件。Slider可以保证配置文件中指定数量的应用正常运行。
Yarn的特性包括：
[*] 支持用户在Yarn集群中创建随需应变的应用
[*] 支持不同的用户/应用运行不同版本的应用
[*] 支持用户配置不同的应用实例
[*] 按需停止/暂停/恢复应用实例
[*] 按需扩展/收缩应用实例
Slider工具是一个Java的命令行应用，它会把信息持久化为JSON文档并存储到HDFS。当集群启动后，我们可以使用命令扩展或者收缩集群。集群也可以被停止或者重启。对Slider感兴趣的朋友可以看看Yu Liu在一个Meetup上的演讲PPT。
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