lec ssmi

Results 9 issues of lec ssmi

I have trired your code in _query-optimization.ipynb_ . When I use the Frameworks.getPlanner() to get the framework planner to do the transform from SqlNode to RelRoot. I use the RelRoot.rel...

`[error] not found: https://repo1.maven.org/maven2/com/typesafe/sbt/sbt-native-packager_2.12_1.0/1.0.0/sbt-native-packager-1.0.0.pom [error] not found: C:\Users\shicheng_work_pc\.ivy2\local\com.typesafe.sbt\sbt-native-packager\scala_2.12\sbt_1.0\1.0.0\ivys\ivy.xml [error] not found: https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.typesafe.sbt/sbt-native-packager/scala_2.12/sbt_1.0/1.0.0/ivys/ivy.xml [error] not found: https://repo.typesafe.com/typesafe/ivy-releases/com.typesafe.sbt/sbt-native-packager/scala_2.12/sbt_1.0/1.0.0/ivys/ivy.xml [error] not found: http://repo.typesafe.com/typesafe/releases/com/typesafe/sbt/sbt-native-packager_2.12_1.0/1.0.0/sbt-native-packager-1.0.0.pom [error] not found: http://repo.typesafe.com/typesafe/snapshots/com/typesafe/sbt/sbt-native-packager_2.12_1.0/1.0.0/sbt-native-packager-1.0.0.pom [error] at lmcoursier.CoursierDependencyResolution.unresolvedWarningOrThrow(CoursierDependencyResolution.scala:245) ` Has anyone...

希望大神能够出一些列的源码解析啊,帮助我们更好地理解flink。

根据介绍,默认的实现是将state存在hdfs,如果某个算子的某个分区的某个版本失败,那么会重新读取存档的分片数据,进行重写。但是如果在end端,如果没有幂等性和事务,一个分区的数据写入一部分后失败了,应该是会重试整个分片吧。那之前写入的那部分还是会出现重复。请问里面提到的end-to-end exactly-once 是怎么得来的呢?

Any plan to add support for Windows OS? It's so unfriendly that developers cannot use JindoFS.

question

According to your statement, if every update will generate a lot of new files, and may be small files, then the number of files will exponentially increase with the number...

calcite本身已经实现的内容,都是基于jdbc那套api的方式。在PrepareStatement和connection里面做文章,让client直接把sql转换我物理执行计划,然后连接到底层的数据库去查询。 但是如果要把这个工作转移到服务器端的话,就需要client将request发送到server,然后server端进行sql->SqlNode->RelNode->PhysicalPlan,但是calcite似乎并没有实现这一模块。所有的案例几乎都是基于jdbc方式,没有什么可参考的。有什么好的做法吗?

ForkJoin的前提是任务可以被拆解,而且这个拆解逻辑要用户自定义。那如果本身是不可拆解的,用ForkJoinPool不是不能提高效率?最近在看akak,里面说ForkJoinPool大多数时候都是比较有效的,不解。