[jira] [Updated] (GIRAPH-675) Mutable edge iterator gets corrupted by calling vertex.getNumEdges() during iteration

["Alessandro Presta (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GIRAPH-675?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alessandro Presta updated GIRAPH-675:
-------------------------------------

    Attachment: GIRAPH-675.patch

Also added a couple test cases.
                
> Mutable edge iterator gets corrupted by calling vertex.getNumEdges() during iteration
> -------------------------------------------------------------------------------------
>
>                 Key: GIRAPH-675
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-675
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Alessandro Presta
>            Assignee: Alessandro Presta
>         Attachments: GIRAPH-675.patch
>
>
> This affects the generic implementation of the mutable iterator. When size() is called, we first call unwrap() to move all remaining edges to the new iterator. This clearly breaks if it's called while iterating (it will exhaust the same iterator we're using).
> The fix is to add a numEdges field to MutableEdgesWrapper, which is initialized to the original number of edges, and decremented whenever remove() is called on the mutable iterator.

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