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https://issues.apache.org/jira/browse/ACCUMULO-4762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16305648#comment-16305648
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Michael Miller commented on ACCUMULO-4762:
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[~bmfach] As a heads up, I am working on ACCUMULO-4771 which should eliminate
some of these synchronous calls.
> Synchronous JS calls are deprecated
> -----------------------------------
>
> Key: ACCUMULO-4762
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4762
> Project: Accumulo
> Issue Type: Bug
> Components: monitor
> Affects Versions: 2.0.0
> Reporter: Michael Miller
> Assignee: Benjamin F
> Fix For: 2.0.0
>
>
> All of the javascript in the Monitor sets the async flag to false before
> loading some values in the monitor. Once the values are loaded, we then set
> the flag to true.
> {code:javascript}
> $.ajaxSetup({
> async: false
> });
> //... load something
> $.ajaxSetup({
> async: true
> });
> {code}
> This currently gives a warning in Chrome since this behavior is deprecated:
> {code:javascript}
> [Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated
> because of its detrimental effects to the end user's experience. For more
> help, check https://xhr.spec.whatwg.org/.
> {code}
> This may not be a problem now but upon further investigation this could be a
> problem in the future. According to the [XMLHttpRequest
> standard|https://xhr.spec.whatwg.org/#synchronous-flag]:
> "...Developers must not pass false for the async argument when current global
> object is a Window object." I look at this as using the Asynchronous JS in a
> way it was not intended to be used and we could probably do this better.
> Fixing this would require some redesign of the Monitor but it would be better
> to do this now before releasing 2.0.
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