HBase 中字段超时（TTL）的设置

hbase

发布日期: 2016-08-05

文章字数: 162

阅读时长: 1 分

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定义

TTL(Time to Live) 用于限定数据的超时时间。

设置TTL

创建 test 表，列族 info, TTL设置86400秒过期

# 创建表
create 'test',{NAME => 'info', TTL=>'86400'}

# 查看 test 表结构
hbase(main):004:0> desc 'test'

{NAME => 'info', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => '86400 SECONDS (1 DAY)', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}

修改TTL过期时间

# 禁用表
hbase(main):004:0> disable "test"

# 设置TTL值，作用于列族 info
hbase(main):005:0> alter "test",NAME=>'info',TTL=>'200' 

# 启用表
hbase(main):006:0> enable  "test"

# 查看表结构
hbase(main):004:0> desc 'test'

{NAME => 'info', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => '200 SECONDS', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}