如何從Hive中讀取hbase當前版本和以前版本的數據

Question

我想使用Hive從hbase表中讀取所有數據。 應該能夠從HBase的

Answer 1

讀取所有當前和以前版本的數據，您可以指定number of version你得到掃描和獲取，它會檢索它們：

HTable cTable = new HTable(TableName); 
Get res = new Get(Bytes.toBytes(key)); 

//set no. of version that you want to fetch. 
res.setMaxVersions(verNo); <-- 

Result fetchRow = cTable.get(res); 
NavigableMap<byte[], NavigableMap<byte[], NavigableMap<Long,byte[] >>> allVersions = fetchRow.getMap(); 

Note：版本默認情況下禁用同時創建表格。 所以，你需要啓用它。

create 'employee',{NAME=>"myname",Versions=>2},'office' //Here versioning is enabled for column "myname" as "2" and no versioning for column "office" 

describe 'employee'         // show you versioning information. 

alter 'employee',NAME=>'office',VERSIONS =>4   // Alter 

// Put and scan the table - it will show new and old value 
put 'employee','1','myname:name','Jigyasa1' 
put 'employee','1','myname:name','Jigyasa2' 
put 'employee','1','office:name','Add1' 
put 'employee','1','office:name','Add2' 

scan 'employee',{VERSIONS=>10} 

對於Hbase-hive集成請參考參考文獻。鏈接： https://cwiki.apache.org/confluence/display/Hive/HBaseIntegration