[jira] [Commented] (KAFKA-4734) timeindex on old segments not trimmed to actual size

["Jun Rao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-4734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15852317#comment-15852317 ] 

Jun Rao commented on KAFKA-4734:
--------------------------------

[~becket_qin], do you think you could take a look at this? Thanks.

> timeindex on old segments not trimmed to actual size 
> -----------------------------------------------------
>
>                 Key: KAFKA-4734
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4734
>             Project: Kafka
>          Issue Type: Improvement
>    Affects Versions: 0.10.1.0
>            Reporter: Jun Rao
>
> When upgrading from 0.9.0 to 0.10.1, the broker creates empty .timeindex files on old log segments without trimming them. So, on disk, you will see .timeindex files with preallocated size.
> -rw-r--r--  1 junrao  wheel  10485756 Feb  3 15:15 00000000000000000000.timeindex
> -rw-r--r--  1 junrao  wheel  10485756 Feb  3 15:15 00000000000000000960.timeindex
> -rw-r--r--  1 junrao  wheel  10485756 Feb  3 15:15 00000000000000001920.timeindex
> -rw-r--r--  1 junrao  wheel  10485756 Feb  3 15:15 00000000000000002880.timeindex
> -rw-r--r--  1 junrao  wheel  10485756 Feb  3 15:15 00000000000000003840.timeindex
> -rw-r--r--  1 junrao  wheel  10485760 Feb  3 15:15 00000000000000004800.index
> -rw-r--r--  1 junrao  wheel  10485756 Feb  3 15:15 00000000000000004800.timeindex
> If the broker is restarted again, all .timeindex files (except for the one on the active segment) are trimmed to 0 size. It would be better if we do that in the first place.



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