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https://issues.apache.org/jira/browse/HBASE-16729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan updated HBASE-16729:
-------------------------------------------
    Hadoop Flags: Incompatible change
    Release Note: Empty filter list will behave as when there is no filter 
added. This change is a behavioral change for those who rely on Empty filter 
list.  (was: Empty FilterList will do nothing)

> Define the behavior of (default) empty FilterList
> -------------------------------------------------
>
>                 Key: HBASE-16729
>                 URL: https://issues.apache.org/jira/browse/HBASE-16729
>             Project: HBase
>          Issue Type: Wish
>    Affects Versions: 2.0.0
>            Reporter: ChiaPing Tsai
>            Assignee: ChiaPing Tsai
>            Priority: Trivial
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16729.v0.patch, HBASE-16729.v1.patch, 
> HBASE-16729.v2.patch
>
>
> Current empty FilterList filters all data, because the 
> FilterList#isFamilyEssential always returns false which causes the null cell 
> retrieved by RegionScannerImpl.storeHeap.
> It seems to me that empty FilterList should do nothing, because the following 
> code is common.
> {noformat}
> private static Filter makeFilter() {
>   FilterList filterList = new FilterList ();
>   for (some conditions) {
>     // add some filters. Or nothing to add.
>   }
>   return filterList;
> }
> {noformat}
> If we keep the current logic which filters all data, we should add enough 
> comments to explain it. Or add the FilterList#size() or FilterList#empty() 
> for preventing filtering all data.
> Any comments? Thanks.



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