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From "Biju Nair (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15676) FuzzyRowFilter fails and matches all the rows in the table if the mask consists of all 0s
Date Fri, 11 Aug 2017 14:24:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123410#comment-16123410
] 

Biju Nair commented on HBASE-15676:
-----------------------------------

Can we also update the [API docs|https://hbase.apache.org/apidocs/org/apache/hadoop/hbase/filter/FuzzyRowFilter.html]
for the fuzzy byte change from "0" to "2".

> FuzzyRowFilter fails and matches all the rows in the table if the mask consists of all
0s
> -----------------------------------------------------------------------------------------
>
>                 Key: HBASE-15676
>                 URL: https://issues.apache.org/jira/browse/HBASE-15676
>             Project: HBase
>          Issue Type: Bug
>          Components: Filters
>    Affects Versions: 2.0.0, 0.98.13, 1.0.2, 1.2.0, 1.1.1
>            Reporter: Rohit Sinha
>            Assignee: Matt Warhaftig
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 1.1.5, 1.2.2, 0.98.20
>
>         Attachments: hbase-15287-0.98-v1.patch, hbase-15676-v1.patch, hbase-15676-v2.patch,
hbase-15676-v3.patch, hbase-15676-v4.patch
>
>
> While using FuzzyRowFilter we noticed that if the mask array consists of all 0s (fixed)
the FuzzyRowFilter matches all the rows in the table. We noticed this on HBase 1.1, 1.2 and
higher.
> After some digging we suspect that this is because of isPreprocessedMask() check which
is used in preprocessMask() which was added here: https://issues.apache.org/jira/browse/HBASE-13761
> If the mask consists of all 0s then the isPreprocessedMask() returns true and the preprocessing
which responsible for changing 0s to -1 doesn't happen and hence all rows are matched in scan.
> This scenario can be tested in TestFuzzyRowFilterEndToEnd#testHBASE14782() If we change
the 
> byte[] fuzzyKey = Bytes.toBytesBinary("\\x00\\x00\\x044");
> byte[] mask = new byte[] {1,0,0,0};
> to 
> byte[] fuzzyKey = Bytes.toBytesBinary("\\x9B\\x00\\x044e");
> byte[] mask = new byte[] {0,0,0,0,0};
> We expect one match but this will match all the rows in the table. 



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