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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6791) CompressedSequentialWriter can write zero-length segments during scrub
Date Sun, 02 Mar 2014 02:20:19 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917269#comment-13917269
] 

Jonathan Ellis commented on CASSANDRA-6791:
-------------------------------------------

Brandon has a copy of the data that can reproduce this, via [~kvaster].

> CompressedSequentialWriter can write zero-length segments during scrub
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-6791
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6791
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Marcus Eriksson
>            Priority: Minor
>             Fix For: 1.2.16, 2.0.6
>
>
> This results in errors like this:
> {noformat}
> java.lang.IllegalArgumentException
> 	at java.nio.Buffer.limit(Buffer.java:267)
> 	at org.apache.cassandra.io.compress.CompressedRandomAccessReader.decompressChunk(CompressedRandomAccessReader.java:108)
> 	at org.apache.cassandra.io.compress.CompressedRandomAccessReader.reBuffer(CompressedRandomAccessReader.java:87)
> 	at org.apache.cassandra.io.util.RandomAccessReader.seek(RandomAccessReader.java:280)
> {noformat}
> (Because a zero-length chunk actually turns into a length of -4 in the {{compressed.limit(chunk.length)}}
call, since no checksum is written either.)
> I thought this would be from two bad rows in a row, but it's not; the source file that
resulted in scrub creating this, did not have any of those.  (But it does have several instances
of bad-good-bad, i.e. separated by exactly one row, that is not large enough to force a new
compressed chunk.)



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