HBase实现记录定期定量删除
我们在HBase中存储的记录可能有一些是增速很快且又不需要永久保存的，比如大量的ldquo;系统日志rdquo;，也许只需保存最近几个月
文中可能涉及到的API：
Hadoop/HDFS:
HBase: ?overview-summary.html
Begin！
HBase如何实现定期定量的删除记录？使用场景分析：我们在HBase中存储的记录可能有一些是增速很快且又不需要永久保存的，比如大量的“系统日志”，也许只需保存最近几个月记录便可。我们的存储空间又很有限，尤其是HDFS这种多副本容灾存储。再加上HBase在存储每一行数据时，分别要为每一列保存一份rowKey，如果一行有10列，光rowKey就要存储10份，开销可想而知。因此定期定量删除的功能也就成了普遍的需求。
一、如何定期删除数据？使用表格级的属性：TTL（Time To Live），设置记录的有效期，当前时间超过记录有效期后该记录将被自动删除。记录的有效期 = TimeStamp + TTL；
二、如何在数据超过阈值时删除数据？比如我们限定某张表最多占用约1T的空间，当数据超过1T时就删除表中最老的一部分数据。
1、在HDFS层面，，获取表格占用空间。通过Configuration实例创建FileSystem实例，调用Fs的获取表格目录的ContentSummary实例，再调用()便可获得该表格的大小。
2、若表格大小超过阈值，删除时间戳较小的一定量的记录。通过hbase api中scan的setTimeRange方法完成待删除的数据筛选，然后删之~
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