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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6562) Fake KVs are sometimes passed to filters
Date Thu, 03 Jan 2013 07:16:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13542763#comment-13542763
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Lars Hofhansl commented on HBASE-6562:
--------------------------------------

Specifically the issue here is with this code in StoreFileScanner:
{code}
    // Multi-column Bloom filter optimization.
    // Create a fake key/value, so that this scanner only bubbles up to the top
    // of the KeyValueHeap in StoreScanner after we scanned this row/column in
    // all other store files. The query matcher will then just skip this fake
    // key/value and the store scanner will progress to the next column. This
    // is obviously not a "real real" seek, but unlike the fake KV earlier in
    // this method, we want this to be propagated to ScanQueryMatcher.
    cur = kv.createLastOnRowCol();
{code}
So it seems that is in purpose but has the unfortunate side-effect that these KVs are now
presented to the Filter.filterRowKey(...)
                
> Fake KVs are sometimes passed to filters
> ----------------------------------------
>
>                 Key: HBASE-6562
>                 URL: https://issues.apache.org/jira/browse/HBASE-6562
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Minor
>             Fix For: 0.96.0
>
>         Attachments: 6562.txt, 6562-v2.txt, 6562-v3.txt, minimalTest.java
>
>
> In internal tests at Salesforce we found that fake row keys sometimes are passed to filters
(Filter.filterRowKey(...) specifically).
> The KVs are eventually filtered by the StoreScanner/ScanQueryMatcher, but the row key
is passed to filterRowKey in RegionScannImpl *before* that happens.

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