GitHub user zhouyejoe opened a pull request:
https://github.com/apache/spark/pull/20744
[SPARK-23608][CORE][WebUI] Add synchronization in SHS between attachSparkUI
and detachSparkUI functions to avoid concurrent modification issue to Jetty
Handlers
Jetty handlers are dynamically attached/detached while SHS is running. But
the attach and detach operations might be taking place at the same time due to
the async in load/clear in Guava Cache.
## What changes were proposed in this pull request?
Add synchronization between attachSparkUI and detachSparkUI in SHS.
## How was this patch tested?
With this patch, the jetty handlers missing issue never happens again in
our production cluster SHS.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zhouyejoe/spark SPARK-23608
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20744.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20744
----
commit f4118c03d7ea8cdd9ade5ec44db3e1bcb5f45535
Author: Ye Zhou <yezhou@...>
Date: 2018-03-06T02:19:17Z
[SPARK-23608][CORE][WebUI] Add synchronization in SHS between attachSparkUI
and detachSparkUI functions to avoid concurrent modification issue to Jetty
Handlers.
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