[jira] [Commented] (KAFKA-5007) Kafka Replica Fetcher Thread- Resource Leak

["Joseph Aliase (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-5007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276926#comment-16276926 ] 

Joseph Aliase commented on KAFKA-5007:
--------------------------------------

[~huxi_2b] The only exception I saw the selector class was EOFException which should be handled in the IOException block.

We lately have not seen the issue after we upgraded our NIC. But that doesn't solve the issue at Kafka level.


> Kafka Replica Fetcher Thread- Resource Leak
> -------------------------------------------
>
>                 Key: KAFKA-5007
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5007
>             Project: Kafka
>          Issue Type: Bug
>          Components: core, network
>    Affects Versions: 0.10.0.0, 0.10.1.1, 0.10.2.0
>         Environment: Centos 7
> Jave 8
>            Reporter: Joseph Aliase
>            Priority: Critical
>              Labels: reliability
>         Attachments: jstack-kafka.out, jstack-zoo.out, lsofkafka.txt, lsofzookeeper.txt
>
>
> Kafka is running out of open file descriptor when system network interface is done.
> Issue description:
> We have a Kafka Cluster of 5 node running on version 0.10.1.1. The open file descriptor for the account running Kafka is set to 100000.
> During an upgrade, network interface went down. Outage continued for 12 hours eventually all the broker crashed with java.io.IOException: Too many open files error.
> We repeated the test in a lower environment and observed that Open Socket count keeps on increasing while the NIC is down.
> We have around 13 topics with max partition size of 120 and number of replica fetcher thread is set to 8.
> Using an internal monitoring tool we observed that Open Socket descriptor   for the broker pid continued to increase although NIC was down leading to  Open File descriptor error. 



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