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From "Jay Kreps (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-748) Append to index fails due to invalid offset
Date Thu, 07 Feb 2013 23:51:13 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13574067#comment-13574067
] 

Jay Kreps commented on KAFKA-748:
---------------------------------

Okay the problem here is the resize method. We generalized index.trimInvalid to index.resize
to be able to enlarge the index when we load a segment. This was done to avoid rolling the
log on a full index, I think, which had other problems with empty indexes. However it looks
like this never actually was tried, because doing this resets the position in the mmap to
0, so we start overwriting the entries in the index from the beginning but expanding what
we think the valid segment of the memory map is. When we close we then have a bunch of zeros
at the end of the index and have overwritten the front of the file.
                
> Append to index fails due to invalid offset
> -------------------------------------------
>
>                 Key: KAFKA-748
>                 URL: https://issues.apache.org/jira/browse/KAFKA-748
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.8
>            Reporter: Sriram Subramanian
>            Assignee: Jay Kreps
>            Priority: Blocker
>              Labels: p1
>             Fix For: 0.8
>
>         Attachments: outindex, outmsg
>
>
> We seem to be appending to the index and it checks to make sure we do not insert an entry
with an offset that is larger than the actual offset of the message. We seem to be trying
to insert an offset = 1 in the index while lastOffset is 24463. This seems to get fixed on
restarting the broker.
> java.lang.IllegalArgumentException: Attempt to append an offset (1) to position 21703
no larger than the last offset appended (24463).
> at kafka.log.OffsetIndex.append(OffsetIndex.scala:183)
> at kafka.log.LogSegment.append(LogSegment.scala:60)
> at kafka.log.Log.append(Log.scala:286)
> at kafka.server.KafkaApis$$anonfun$appendToLocalLog$2.apply(KafkaApis.scala:188)
> at kafka.server.KafkaApis$$anonfun$appendToLocalLog$2.apply(KafkaApis.scala:181)
> at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:206)
> at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:206)
> at scala.collection.immutable.Map$Map1.foreach(Map.scala:105)
> at scala.collection.TraversableLike$class.map(TraversableLike.scala:206)

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