How to realize hbase list pagination
Editor to share with you how to achieve hbase list paging, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!
The paging implementation of HBase is relatively complex. The core idea is to combine the paging filter PageFilter (pageSize) and the query setting starting line scan.setStartRow (lastRow). LastRow is the last query rowkey. It should be noted that the rowkey is an array that corresponds to the storage location of multiple fields.
Different users log in to produce different lastRow, so we store lastRow in session
In order to decouple, we encapsulate the operation of lastRow into HBaseDaoImpl, so that developers do not need to care about the operation of lastRow when writing code.
Public PageInfo searchXControl (QueryControlRuleQO qo,IntegerpageSize,Integer currteIndex) throwsException {
/ / conditional filter
FilterList filterList = new QueryControlRuleFilterList (qo). GetFilterList ()
/ / Total number of eligible results obtained
Long total = getTotal (controlTableName, filterList)
/ / filter collection
FilterList fl=new FilterList ()
/ / paging filter
Filterfilter = new PageFilter (pageSize)
Fl.addFilter (filterList)
Fl.addFilter (filter)
/ / encapsulate the result set
List list = getList (XControl.class, controlTableName, fl, currteIndex)
Log.info ("- total:" + list.size ())
/ / return the result set
PageInfo page = new PageInfo (total, list)
Return page
}
The above is all the contents of the article "how to achieve hbase list pagination". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!
