[jira] [Created] (HBASE-15676) FuzzyRowFilter fails and matches all the rows in the table if the mask consists of all 0s

["Rohit Sinha (JIRA)" <ji...@apache.org>]

Rohit Sinha created HBASE-15676:
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             Summary: 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: 1.1.1, 1.2.0, 1.0.2, 0.98.13, 2.0.0
            Reporter: Rohit Sinha


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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