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From "Zach York (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18757) Fix Improper bitwise & in BucketCache offset calculation
Date Tue, 05 Sep 2017 22:20:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16154465#comment-16154465

Zach York commented on HBASE-18757:

Yes, this won't cleanly apply to branch-1.3 or branch-1.2 due to: https://issues.apache.org/jira/browse/HBASE-18533
not being applied there. I will attach a patch for 1.3.

> Fix Improper bitwise & in BucketCache offset calculation
> --------------------------------------------------------
>                 Key: HBASE-18757
>                 URL: https://issues.apache.org/jira/browse/HBASE-18757
>             Project: HBase
>          Issue Type: Bug
>          Components: BucketCache
>            Reporter: Zach York
>            Assignee: Zach York
>             Fix For: 1.4.0, 1.3.2, 1.2.7, 2.0.0-alpha-3
>         Attachments: HBASE-18757.master.001.patch, HBASE-18757.master.002.patch
> Offset calculation for BucketCache entries incorrectly uses an int literal to try to
ensure that the offset is positive. However, because it uses the string literal 0xFFFFFFFF
which java uses at an int (which is negative). When it does the bitwise &, java sign extends
the int effectively undoing the original intention of the code and allowing for negative values
to slip through.
> Then the read or write to that block will fail due to trying to read/write at a negative
index which causes the BucketCache to fail.

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