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https://issues.apache.org/jira/browse/GIRAPH-1036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maja Kabiljo resolved GIRAPH-1036.
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    Resolution: Fixed

> 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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