Apache MRQL 0.9.4-incubating 发布

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3月21日 深圳 OSC 源创会开始报名罗，送华为海思开发板
　　Apache MRQL 0.9.4-incubating 发布，此版本是第二个发布的版本，现已提供下载：
　　http://www.apache.org/dyn/closer.cgi/incubator/mrql
　　更新内容：
新特性

• [MRQL-45] Add support for Apache Flink
  
• [MRQL-49] Add Flink support info on the project web site
  
• [MRQL-63] Add support for MRQL streaming in spark streaming mode
  

Bugs 修复

• [MRQL-41] Post-release improvements
  
• [MRQL-42] Fix bug in XML projections
  
• [MRQL-44] Fix the map-reduce join for a complex reducer on map-reduce mode
  
• [MRQL-46] MRQL does not build with Java 8
  
• [MRQL-47] Fix various bugs for the Flink evaluation mode
  
• [MRQL-48] Fix global variable bindings in Spark and Flink modes
  
• [MRQL-50] Fix result dumping to a text file in Flink mode
  
• [MRQL-51] Support for Spark 1.1.0
  
• [MRQL-52] Fix Flink evaluation mode to pass all Junit tests
  
• [MRQL-53] Fix processing of directories of text files in MapReduce mode
  
• [MRQL-58] Fix config file and shell run scripts to support multiple HDFS users
  
• [MRQL-60] Fix building dependencies for hadoop 1.x
  
• [MRQL-61] Fix bug on select over union queries
  
• [MRQL-62] Fix Map-Reduce mode on MultipleInput sources
  
• [MRQL-67] Fix maven build errors for JDK 1.8
  

改进

• [MRQL-43] Add support for tracing
  
• [MRQL-54] Adjust the split size of a map-reduce input file based on the number of requested nodes
  
• [MRQL-55] Add support for Hadoop Sequence input format in flink mode
  
• [MRQL-56] Improve total aggregations and repetitions with shared results in Flink mode
  
• [MRQL-57] Make floating-point literals to be double instead of float
  

任务

• [MRQL-64] Prepare for 0.9.4 release
  

　　发行说明：
　　http://mrql.incubator.apache.org/ReleaseNotes-0.9.4.html
　　MRQL (发音 miracle) 是一个查询处理和优化系统，适用于大规模分布式的数据分析。MRQL (MapReduce Query  Language) 是一个在计算机集群中对大规模数据的类 SQL 查询语言。MRQL 查询处理系统可使用如下三种模式评估 MRQL 查询：

• 使用 Hadoop 的 Map-Reduce 模式
  
• 使用 Apache Hama 的 BSP 模式 (Bulk Synchronous Parallel mode)
  
• 基于 Apache Spark 的 Spark 模式