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https://issues.apache.org/jira/browse/FLINK-9878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16548014#comment-16548014
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ASF GitHub Bot commented on FLINK-9878:
---------------------------------------
Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/6355#discussion_r203437995
--- Diff:
flink-core/src/main/java/org/apache/flink/configuration/SecurityOptions.java ---
@@ -160,4 +160,41 @@
key("security.ssl.verify-hostname")
.defaultValue(true)
.withDescription("Flag to enable peer’s hostname
verification during ssl handshake.");
+
+ /**
+ * SSL session cache size.
+ */
+ public static final ConfigOption<Integer> SSL_SESSION_CACHE_SIZE =
+ key("security.ssl.session-cache-size")
+ .defaultValue(-1)
+ .withDescription("The size of the cache used for
storing SSL session objects. "
+ + "According to
https://github.com/netty/netty/issues/832, you should always set "
+ + "this to an appropriate number to not run
into a bug with stalling IO threads "
+ + "during garbage collection. (-1 = use system
default).");
+
+ /**
+ * SSL session timeout.
+ */
+ public static final ConfigOption<Integer> SSL_SESSION_TIMEOUT =
+ key("security.ssl.session-timeout")
+ .defaultValue(-1)
+ .withDescription("The timeout (in ms) for the cached
SSL session objects. (-1 = use system default)");
+
+ /**
+ * SSL session timeout during handshakes.
+ */
+ public static final ConfigOption<Integer> SSL_HANDSHAKE_TIMEOUT =
+ key("security.ssl.handshake-timeout")
+ .defaultValue(-1)
+ .withDescription("The timeout (in ms) during SSL
handshake. (-1 = use system default)");
+
+ /**
+ * SSL session timeout after flushing the `close_notify` message.
+ */
+ public static final ConfigOption<Integer>
SSL_CLOSE_NOTIFY_FLUSH_TIMEOUT =
+ key("security.ssl.close-notify-flush-timeout")
+ .defaultValue(-1)
+ .withDescription("The timeout (in ms) for flushing the
`close_notify` that was triggered by closing a " +
--- End diff --
it's not showing up as a code block since that only works for markdown; the
description so far was plain-text.
> 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: 1.5.2, 1.6.0
>
>
> 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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