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Date: Thu, 27 Sep 2012 00:13:08 +1100 (NCT)
From: "Lucian George Iordache (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Updated] (HBASE-6846) BitComparator bug -
 ArrayIndexOutOfBoundsException
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     [ https://issues.apache.org/jira/browse/HBASE-6846?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lucian George Iordache updated HBASE-6846:
------------------------------------------

    Attachment: HBASE-6846.patch
    
> BitComparator bug - ArrayIndexOutOfBoundsException
> --------------------------------------------------
>
>                 Key: HBASE-6846
>                 URL: https://issues.apache.org/jira/browse/HBASE-6846
>             Project: HBase
>          Issue Type: Bug
>          Components: Filters
>    Affects Versions: 0.94.1
>         Environment: HBase 0.94.1 + Hadoop 2.0.0-cdh4.0.1
>            Reporter: Lucian George Iordache
>         Attachments: HBASE-6846.patch
>
>
> The HBase 0.94.1 BitComparator introduced a bug in the method "compareTo":
> @Override
>   public int compareTo(byte[] value, int offset, int length) {
>     if (length != this.value.length) {
>       return 1;
>     }
>     int b = 0;
>     //Iterating backwards is faster because we can quit after one non-zero byte.
>     for (int i = value.length - 1; i >= 0 && b == 0; i--) {
>       switch (bitOperator) {
>         case AND:
>           b = (this.value[i] & value[i+offset]) & 0xff;
>           break;
>         case OR:
>           b = (this.value[i] | value[i+offset]) & 0xff;
>           break;
>         case XOR:
>           b = (this.value[i] ^ value[i+offset]) & 0xff;
>           break;
>       }
>     }
>     return b == 0 ? 1 : 0;
>   }
> I've encountered this problem when using a BitComparator with a configured this.value.length=8, and in the HBase table there were KeyValues with keyValue.getBuffer().length=207911 bytes. In this case:
>     for (int i = 207910; i >= 0 && b == 0; i--) {
>       switch (bitOperator) {
>         case AND:
>           b = (this.value[207910] ... ==> ArrayIndexOutOfBoundsException
>           break;
> That loop should use:
>   for (int i = length - 1; i >= 0 && b == 0; i--) { (or this.value.length.)
> Should I provide a patch for correcting the problem?

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