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https://issues.apache.org/jira/browse/HBASE-15676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16126129#comment-16126129
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Biju Nair commented on HBASE-15676:
-----------------------------------
Thanks [~elserj] .
> 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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