[jira] [Commented] (KAFKA-1860) File system errors are not detected unless Kafka tries to write

["Ismael Juma (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-1860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15062380#comment-15062380 ] 

Ismael Juma commented on KAFKA-1860:
------------------------------------

Maybe worth filing a PR with this change.

> File system errors are not detected unless Kafka tries to write
> ---------------------------------------------------------------
>
>                 Key: KAFKA-1860
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1860
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Guozhang Wang
>            Assignee: Mayuresh Gharat
>             Fix For: 0.10.0.0
>
>         Attachments: KAFKA-1860.patch
>
>
> When the disk (raid with caches dir) dies on a Kafka broker, typically the filesystem gets mounted into read-only mode, and hence when Kafka tries to read the disk, they'll get a FileNotFoundException with the read-only errno set (EROFS).
> However, as long as there is no produce request received, hence no writes attempted on the disks, Kafka will not exit on such FATAL error (when the disk starts working again, Kafka might think some files are gone while they will reappear later as raid comes back online). Instead it keeps spilling exceptions like:
> {code}
> 2015/01/07 09:47:41.543 ERROR [KafkaScheduler] [kafka-scheduler-1] [kafka-server] [] Uncaught exception in scheduled task 'kafka-recovery-point-checkpoint'
> java.io.FileNotFoundException: /export/content/kafka/i001_caches/recovery-point-offset-checkpoint.tmp (Read-only file system)
> 	at java.io.FileOutputStream.open(Native Method)
> 	at java.io.FileOutputStream.<init>(FileOutputStream.java:206)
> 	at java.io.FileOutputStream.<init>(FileOutputStream.java:156)
> 	at kafka.server.OffsetCheckpoint.write(OffsetCheckpoint.scala:37)
> {code}



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