[jira] [Resolved] (FLINK-9878) IO worker threads BLOCKED on SSL Session Cache while CMS full gc

["Nico Kruber (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-9878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nico Kruber resolved FLINK-9878.
--------------------------------
    Resolution: Fixed

Also forward-ported to:
- release-1.6: b0496f21d70cc1af15569f3632d7a58fd53b8f95
- master: a59ce1ec895765ef56a1c55e0d21ab7beadaaad6

> 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: 1.6.3, 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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