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From "Jay Kreps (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-593) Empty log index file created when it shouldn't be empty
Date Fri, 02 Nov 2012 15:51:12 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489500#comment-13489500
] 

Jay Kreps commented on KAFKA-593:
---------------------------------

trimOrReallocate(isReallocate: Boolean)  is a bit of a hacky interface. This supports resizing
to two sizes: entries or maxSize, but it would be better to just implement the more general
  resize(numEntries: Int)
numEntries is the mmap.limit/8. It might be nice to leave the helper method trimToSize as
a less error prone alias
  def trimToSize() = resize(entries)
If we do this we should be able to use resize to implement OffsetIndex.truncateTo (the difference
between truncateTo and resize is that truncateTo is in terms of offset whereas resize is in
terms of entries).

We should also add a test case to cover these corner cases.


                
> Empty log index file created when it shouldn't be empty
> -------------------------------------------------------
>
>                 Key: KAFKA-593
>                 URL: https://issues.apache.org/jira/browse/KAFKA-593
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Yang Ye
>         Attachments: kafka_583_zk_kafka_data.tar.gz, kafka_593_v1.diff
>
>
> We have met empty index file during system test when it shouldn't be empty. In this case,
there're around 100 messages in each segment, each of size around 100 bytes, given the "logIndexIntervalBytes"
4096, there should be at least 2 log index entries, but we see empty index file. The kafka
and zookeeper logs are attached
> [yye@yye-ld kafka_server_3_logs]$ cd test_1-2/
> [yye@yye-ld test_1-2]$ ls -l
> total 84
> -rw-r--r-- 1 yye eng        8 Oct 29 15:22 00000000000000000000.index
> -rw-r--r-- 1 yye eng    10248 Oct 29 15:22 00000000000000000000.log
> -rw-r--r-- 1 yye eng        8 Oct 29 15:22 00000000000000000100.index
> -rw-r--r-- 1 yye eng    10296 Oct 29 15:22 00000000000000000100.log
> -rw-r--r-- 1 yye eng        0 Oct 29 15:23 00000000000000000200.index
> -rw-r--r-- 1 yye eng    10293 Oct 29 15:23 00000000000000000200.log
> -rw-r--r-- 1 yye eng        0 Oct 29 15:23 00000000000000000300.index
> -rw-r--r-- 1 yye eng    10274 Oct 29 15:23 00000000000000000300.log
> -rw-r--r-- 1 yye eng        0 Oct 29 15:23 00000000000000000399.index
> -rw-r--r-- 1 yye eng    10276 Oct 29 15:23 00000000000000000399.log
> -rw-r--r-- 1 yye eng        0 Oct 29 15:23 00000000000000000498.index
> -rw-r--r-- 1 yye eng    10256 Oct 29 15:23 00000000000000000498.log
> -rw-r--r-- 1 yye eng 10485760 Oct 29 15:23 00000000000000000596.index
> -rw-r--r-- 1 yye eng     3564 Oct 29 15:23 00000000000000000596.log

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