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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5523) Fix Delete Timerange logic for KEEP_DELETED_CELLS
Date Tue, 06 Mar 2012 02:21:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222929#comment-13222929
] 

Zhihong Yu commented on HBASE-5523:
-----------------------------------

+1 on patch.
                
> Fix Delete Timerange logic for KEEP_DELETED_CELLS
> -------------------------------------------------
>
>                 Key: HBASE-5523
>                 URL: https://issues.apache.org/jira/browse/HBASE-5523
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.94.0, 0.96.0
>
>         Attachments: 5523.txt
>
>
> A Delete at time T marks a Put at time T as deleted.
> In parent I invented special logic that insert a virtual millisecond into the tr if the
encountered KV is a delete marker.
> This was so that there is a way to specify a timerange that would allow to see the put
but not the delete:
> {code}
> if (kv.isDelete()) {
>   if (!keepDeletedCells) {
>     // first ignore delete markers if the scanner can do so, and the
>     // range does not include the marker
>     boolean includeDeleteMarker = seePastDeleteMarkers ?
>     // +1, to allow a range between a delete and put of same TS
>     tr.withinTimeRange(timestamp+1) :
>     tr.withinOrAfterTimeRange(timestamp);
> {code}
> Discussed this today with a coworker and he convinced me that this is very confusing
and also not needed.
> When we have a Delete and Put at the same time T, there *is* not timerange that can include
the Put but not the Delete.
> So I will change the code to this (and fix the tests):
> {code}
> if (kv.isDelete()) {
>   if (!keepDeletedCells) {
>     // first ignore delete markers if the scanner can do so, and the
>     // range does not include the marker
>     boolean includeDeleteMarker = seePastDeleteMarkers ?
>     tr.withinTimeRange(timestamp) :
>     tr.withinOrAfterTimeRange(timestamp);
> {code}
> It's easier to understand, and does not lead to strange scenarios when the TS is used
as a controlled counter.
> Needs to be done before 0.94 goes out.

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