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From "Guanghao Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17958) Avoid passing unexpected cell to ScanQueryMatcher when optimize SEEK to SKIP
Date Fri, 28 Apr 2017 08:03:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988392#comment-15988392
] 

Guanghao Zhang commented on HBASE-17958:
----------------------------------------

When optimize seek to skip, it will call next to next column/row. But the heap's current scanner
maybe changed when call next. The new scanner maybe not seeked because the laze seek feature.
So TestBlocksRead failed. One solution is decide whether to optimize before every next call.
Attach a v6 patch which showed the solution.

> Avoid passing unexpected cell to ScanQueryMatcher when optimize SEEK to SKIP
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-17958
>                 URL: https://issues.apache.org/jira/browse/HBASE-17958
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>         Attachments: 0001-add-one-ut-testWithColumnCountGetFilter.patch, HBASE-17958-v1.patch,
HBASE-17958-v2.patch, HBASE-17958-v3.patch, HBASE-17958-v4.patch, HBASE-17958-v5.patch, HBASE-17958-v6.patch
>
>
> {code}
> ScanQueryMatcher.MatchCode qcode = matcher.match(cell);
> qcode = optimize(qcode, cell);
> {code}
> The optimize method may change the MatchCode from SEEK_NEXT_COL/SEEK_NEXT_ROW to SKIP.
But it still pass the next cell to ScanQueryMatcher. It will get wrong result when use some
filter, etc. ColumnCountGetFilter. It just count the  columns's number. If pass a same column
to this filter, the count result will be wrong. So we should avoid passing cell to ScanQueryMatcher
when optimize SEEK to SKIP.



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