Hbase创建表操作及参数说明
1、创建命名空间
create_namespace \'test\'
2、创建user表,列族:info
create \'test:user\', \'info\'
3、查看表结构
describe \'test:user\'
表结构
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\'}
表结构参数详情
1 DESCRIPTION 2 \'test:user\', //namespace:tableName 3 { 4 NAME => \'info\', //列族 5 BLOOMFILTER => \'ROW\', //参见:http://hbase.apache.org/book.html#bloom.filters.when 6 VERSIONS => \'1\', //设置保存的版本数 7 IN_MEMORY => \'false\', //设置激进缓存,优先考虑将该列族放入块缓存中, 8 //针对随机读操作相对较多的列族可以设置该属性为true 9 KEEP_DELETED_CELLS => \'false\', //参见:http://hbase.apache.org/book.html#cf.keep.deleted 10 DATA_BLOCK_ENCODING => \'NONE\', //数据块编码方式设置 11 //参见:http://hbase.apache.org/book.html#data.block.encoding.enable 12 TTL => \'FOREVER\', //参见: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\', //设置压缩算法 15 MIN_VERSIONS => \'0\', //最小存储版本数 16 BLOCKSIZE => \'65536\', //设置HFile数据块大小(默认64kb) 17 REPLICATION_SCOPE => \'0\', //配置HBase集群replication时需要将该参数设置为1. 18 //参见: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\' //数据块缓存属性 21 }