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Date: Tue, 9 Aug 2011 17:15:27 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Commented] (CASSANDRA-1717) Cassandra cannot detect
 corrupt-but-readable column data
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    [ https://issues.apache.org/jira/browse/CASSANDRA-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081773#comment-13081773 ] 

Hudson commented on CASSANDRA-1717:
-----------------------------------

Integrated in Cassandra #1010 (See [https://builds.apache.org/job/Cassandra/1010/])
    Add block level checksum for compressed data
patch by Pavel Yaskevich; reviewed by Sylvain Lebresne for CASSANDRA-1717

xedin : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1155420
Files : 
* /cassandra/trunk/test/unit/org/apache/cassandra/Util.java
* /cassandra/trunk/test/unit/org/apache/cassandra/io/compress/CompressedRandomAccessReaderTest.java
* /cassandra/trunk/src/java/org/apache/cassandra/io/compress/CorruptedBlockException.java
* /cassandra/trunk/CHANGES.txt
* /cassandra/trunk/src/java/org/apache/cassandra/io/compress/CompressedRandomAccessReader.java
* /cassandra/trunk/test/unit/org/apache/cassandra/io/util/BufferedRandomAccessFileTest.java
* /cassandra/trunk/src/java/org/apache/cassandra/io/compress/CompressionMetadata.java
* /cassandra/trunk/src/java/org/apache/cassandra/utils/FBUtilities.java
* /cassandra/trunk/src/java/org/apache/cassandra/io/compress/CompressedSequentialWriter.java


> Cassandra cannot detect corrupt-but-readable column data
> --------------------------------------------------------
>
>                 Key: CASSANDRA-1717
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1717
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Pavel Yaskevich
>             Fix For: 1.0
>
>         Attachments: CASSANDRA-1717-v2.patch, CASSANDRA-1717-v3.patch, CASSANDRA-1717.patch, checksums.txt
>
>
> Most corruptions of on-disk data due to bitrot render the column (or row) unreadable, so the data can be replaced by read repair or anti-entropy.  But if the corruption keeps column data readable we do not detect it, and if it corrupts to a higher timestamp value can even resist being overwritten by newer values.

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