Apache Accumulo 1.8.0 发布，K/V 存储方案

Apache Accumulo 1.8.0 发布了，Apache Accumulo 是一个可靠的、可伸缩的、高性能的排序分布式的 Key-Value 存储解决方案，基于单元访问控制以及可定制的服务器端处理。使用 Google BigTable 设计思路，基于 Apache Hadoop、Zookeeper 和 Thrift 构建。

主要改进：

• Speed up WAL roll overs
  

• User level API for RFile
  

• Suspend Tablet assignment for rolling restarts
  

• Run multiple Tablet Servers on one node
  

• Rate limiting Major Compactions
  

• Table Sampling
  

• Default port for Monitor changed to 9995

其他改进：

• ACCUMULO-1055 Configurable maximum file size for merging minor compactions

• ACCUMULO-1124 Optimization of RFile index

• ACCUMULO-2883 API to fetch current tablet assignments

• ACCUMULO-3871 Support for running integration tests in MapReduce

• ACCUMULO-3920 Deprecate the MockAccumulo class and remove usage in our tests

• ACCUMULO-4339 Make hadoop-minicluster optional dependency of acccumulo-minicluster

• ACCUMULO-4318 BatchWriter, ConditionalWriter, and ScannerBase now extend AutoCloseable

• ACCUMULO-4326 Value constructor now accepts Strings (and Charsequences)

• ACCUMULO-4354 Bump dependency versions to include gson, jetty, and sl4j

• ACCUMULO-3735 Bulk Import status page on the monitor

• ACCUMULO-4066 Reduced time to processes conditional mutations.

• ACCUMULO-4164 Reduced seek time for cached data

下载地址：https://accumulo.apache.org/downloads/