Hbase創建表操作及參數說明
1、創建命名空間
create_namespace 'test'
2、創建user表,列族:info
create 'test:user', 'info'
3、查看表結構
describe 'test:user'
表結構
Table test:user is ENABLED
test:user
COLUMN FAMILIES DESCRIPTION
{NAME => 'info', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'F
ALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BL
OCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}
表結構參數詳情
1 DESCRIPTION 2 'test:user', //namespace:tableName 3 { 4 NAME => 'info', //列族 5 BLOOMFILTER => 'ROW', //參見:http://hbase.apache.org/book.html#bloom.filters.when 6 VERSIONS => '1', //設置保存的版本數 7 IN_MEMORY => 'false', //設置激進緩存,優先考慮將該列族放入塊緩存中, 8 //針對隨機讀操作相對較多的列族可以設置該屬性為true 9 KEEP_DELETED_CELLS => 'false', //參見:http://hbase.apache.org/book.html#cf.keep.deleted 10 DATA_BLOCK_ENCODING => 'NONE', //數據塊編碼方式設置 11 //參見:http://hbase.apache.org/book.html#data.block.encoding.enable 12 TTL => 'FOREVER', //參見:http://hbase.apache.org/book.html#ttl 13 'ColumnFamilies can set a TTL length in seconds, and HBase reached.
This applies to all versions of a row - even the current one.
The TTL time encoded in the HBase for the row is specified in UTC.' 14 COMPRESSION => 'NONE', //設置壓縮算法 15 MIN_VERSIONS => '0', //最小存儲版本數 16 BLOCKSIZE => '65536', //設置HFile數據塊大小(默認64kb) 17 REPLICATION_SCOPE => '0', //配置HBase集群replication時需要將該參數設置為1. 18 //參見:http://blog.cloudera.com/blog/2012/08/hbase-replication-operational-overview/?utm_source=tuicool 19 'REPLICATION_SCOPE is a column-family level attribute user has to alter each column family with the alter command as shown above,
for all the column families he wants to replicate.' 20 OCKCACHE => 'true' //數據塊緩存屬性 21 }