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https://issues.apache.org/jira/browse/KAFKA-1646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14161857#comment-14161857
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xueqiang wang commented on KAFKA-1646:
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This issue is caused by the discrete blocks of a segment log file in Windows
NTFS system. Unlike Linux, Window doesn’t allocate a large space in the disk
when creating a new file, and it just finds free blocks if new data come in and
links them. Then after a lot of segment log deleting and creating, log blocks
may be spread all over the disk. So if a consumer reads data from the disk, the
performance will be down.
> Improve consumer read performance for Windows
> ---------------------------------------------
>
> Key: KAFKA-1646
> URL: https://issues.apache.org/jira/browse/KAFKA-1646
> Project: Kafka
> Issue Type: Improvement
> Components: log
> Affects Versions: 0.8.1.1
> Environment: Windows
> Reporter: xueqiang wang
> Labels: newbie, patch
> Attachments: Improve consumer read performance for Windows.patch
>
>
> This patch is for Window platform only. In Windows platform, if there are
> more than one replicas writing to disk, the segment log files will not be
> consistent in disk and then consumer reading performance will be dropped down
> greatly. This fix allocates more disk spaces when rolling a new segment, and
> then it will improve the consumer reading performance in NTFS file system.
> This patch doesn't affect file allocation of other filesystems, for it only
> adds statements like 'if(Os.iswindow)' or adds methods used on Windows.
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