unsubscribe Itsuki Toyota (JIRA) <[email protected]> 于2019年8月11日周日 下午8:54写道：
> Itsuki Toyota created HBASE-22833: > ------------------------------------- > > Summary: MultiRowRangeFilter should provide a method for > creating a filter which is functionally equivalent to multiple prefix > filters > Key: HBASE-22833 > URL: https://issues.apache.org/jira/browse/HBASE-22833 > Project: HBase > Issue Type: Wish > Components: Client > Affects Versions: 3.0.0 > Reporter: Itsuki Toyota > > > HI, > > I think current formal way to make multiple prefix filters is to create a > _FilterList_ and add _PrefixFilter_ instances to the list: > > {code:java} > FilterList allFilters = new FilterList(FilterList.Operator.MUST_PASS_ONE); > allFilters.addFilter(new PrefixFilter(Bytes.toBytes("123"))); > allFilters.addFilter(new PrefixFilter(Bytes.toBytes("456"))); > allFilters.addFilter(new PrefixFilter(Bytes.toBytes("678"))); > scan.setFilter(allFilters); > {code} > > (c.f., > https://stackoverflow.com/questions/41074213/hbase-how-to-specify-multiple-prefix-filters-in-a-single-scan-operation > ) > > However, in the case of creating a single prefix filter, HBase provides > _scan.setRowPrefixFilter_ method. > This method creates a range filter by setting a start row and a stop row. > The value of a stop row is decided by calling > _calculateTheClosestNextRowKeyForPrefix_ ( c.f., > https://github.com/apache/hbase/blob/master/hbase-client/src/main/java/org/apache/hadoop/hbase/client/Scan.java#L574-L597 > ) > > _MultiRowRangeFilter_ could leverage a list of start row and stop row > pairs and _calculateTheClosestNextRowKeyForPrefix_ could compute the stop > row value corresponding to given start row (i.e., a prefix). > > I think this kind of filter (a filter which is functionally equivalent to > multiple prefix filters) should be creatable by _MultiRowRangeFilter_ and > it's better than the current formal way. > > Cheers, > > > > -- > This message was sent by Atlassian JIRA > (v7.6.14#76016) >
