[SPARK-23608][CORE][WebUI] Add synchronization in SHS between attachSparkUI and detachSparkUI functions to avoid concurrent modification issue to Jetty Handlers#20744

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zhouyejoe wants to merge 4 commits intoapache:masterfrom

zhouyejoe:SPARK-23608

Commits on Mar 6, 2018

[SPARK-23608][CORE][WebUI] Add synchronization in SHS between attachSparkUI and detachSparkUI functions to avoid concurrent modification issue to Jetty Handlers.
zhouyejoe
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Commits on Mar 8, 2018

Fix the Scala style check issue
zhouyejoe
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Commits on Mar 12, 2018

Fine grain synchronization on handlers only for better performance.
zhouyejoe
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Commits on Mar 14, 2018

Move addfilters to handlers into synchronized block
zhouyejoe
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