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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（腾云科技ty300.com）。使用 Google BigTable 设计思路（基础教程qkxue.net），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/
Apache Accumulo 1.8.0 发布，K/V 存储方案
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原文地址：http://www.cnblogs.com/cainiaojiaocheng/p/5851822.html
