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https://issues.apache.org/jira/browse/YARN-3025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292973#comment-14292973
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Tsuyoshi OZAWA commented on YARN-3025:
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{quote}
Lets say 1000 AMs pinging every 1 sec.
{quote}
I expected that we only synchronize the state only when RM detect the the
difference of blacklists before and after the heartbeat. I thought probability
to mark nodes as blacklist is not so high. What do you think?
{quote}
Yes. But that would mean that the RM cannot provide the latest updates.
{quote}
I think it can be acceptable for many cases if the blacklist node are updated
within 1 min or some minutes e.g. for admin's knowing cluster information. In
this case, we should also document it explicitly to know the trade off of the
sync interval.
> Provide API for retrieving blacklisted nodes
> --------------------------------------------
>
> Key: YARN-3025
> URL: https://issues.apache.org/jira/browse/YARN-3025
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Ted Yu
>
> We have the following method which updates blacklist:
> {code}
> public synchronized void updateBlacklist(List<String> blacklistAdditions,
> List<String> blacklistRemovals) {
> {code}
> Upon AM failover, there should be an API which returns the blacklisted nodes
> so that the new AM can make consistent decisions.
> The new API can be:
> {code}
> public synchronized List<String> getBlacklistedNodes()
> {code}
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