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https://issues.apache.org/jira/browse/GIRAPH-1036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15274495#comment-15274495
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Maja Kabiljo commented on GIRAPH-1036:
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https://reviews.facebook.net/D49143
> Allow mappers to fail early on exceptions
> -----------------------------------------
>
> Key: GIRAPH-1036
> URL: https://issues.apache.org/jira/browse/GIRAPH-1036
> Project: Giraph
> Issue Type: Bug
> Reporter: Maja Kabiljo
> Assignee: Maja Kabiljo
>
> Often when something fails in a mapper we see it stuck until its timeout
> passes. Digging through this issue I found two root causes:
> - Many threads we are creating were not daemon, preventing process to exit,
> only main thread should be daemon
> - When calling submit on ExecutorService, exceptions are not propagated back
> to the caller, unless get is called on the future. In
> ProgressableUtils.getResultsWithNCallables we were calling get on one by one
> future, causing us to have to wait for previous futures to finish before
> getting exception which happened in later one.
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