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From "Nico Kruber (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9878) IO worker threads BLOCKED on SSL Session Cache while CMS full gc
Date Mon, 20 Aug 2018 21:56:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16586571#comment-16586571
] 

Nico Kruber commented on FLINK-9878:
------------------------------------

Fixed via:
- `release-1.5`: 9e421a438dd830c6be72e5f13f855e68a82aef21

(1.6 and master will get new forward-PRs)

> IO worker threads BLOCKED on SSL Session Cache while CMS full gc
> ----------------------------------------------------------------
>
>                 Key: FLINK-9878
>                 URL: https://issues.apache.org/jira/browse/FLINK-9878
>             Project: Flink
>          Issue Type: Bug
>          Components: Network
>    Affects Versions: 1.5.0, 1.5.1, 1.6.0
>            Reporter: Nico Kruber
>            Assignee: Nico Kruber
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.6.1, 1.7.0, 1.5.4
>
>
> According to https://github.com/netty/netty/issues/832, there is a JDK issue during garbage
collection when the SSL session cache is not limited. We should allow the user to configure
this and further (advanced) SSL parameters for fine-tuning to fix this and similar issues.
In particular, the following parameters should be configurable:
> - SSL session cache size
> - SSL session timeout
> - SSL handshake timeout
> - SSL close notify flush timeout



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