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From "Vinoth Chandar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-2580) Kafka Broker keeps file handles open for all log files (even if its not written to/read from)
Date Fri, 02 Oct 2015 22:43:26 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-2580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14941910#comment-14941910

Vinoth Chandar commented on KAFKA-2580:

A LRU file handle is something very commonly employed in databases, which works pretty well
in practice. (considering that it involves random access).  So +1  on that path. 

[~granthenke] would you have cycles for this? If no one is working on this currently, we (uber)
can take a stab at this, later this quarter. 

> Kafka Broker keeps file handles open for all log files (even if its not written to/read
> ---------------------------------------------------------------------------------------------
>                 Key: KAFKA-2580
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2580
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions:
>            Reporter: Vinoth Chandar
> We noticed this in one of our clusters where we stage logs for a longer amount of time.
It appears that the Kafka broker keeps file handles open even for non active (not written
to or read from) files. (in fact, there are some threads going back to 2013 http://grokbase.com/t/kafka/users/132p65qwcn/keeping-logs-forever)

> Needless to say, this is a problem and forces us to either artificially bump up ulimit
(its already at 100K) or expand the cluster (even if we have sufficient IO and everything).

> Filing this ticket, since I could find anything similar. Very interested to know if there
are plans to address this (given how Samza's changelog topic is meant to be a persistent large
state use case).  

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