[jira] [Assigned] (FLINK-2253) ALS fails if the data flow is split up and the input is non-deterministic

["Till Rohrmann (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-2253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Till Rohrmann reassigned FLINK-2253:
------------------------------------

    Assignee:     (was: Till Rohrmann)

> ALS fails if the data flow is split up and the input is non-deterministic
> -------------------------------------------------------------------------
>
>                 Key: FLINK-2253
>                 URL: https://issues.apache.org/jira/browse/FLINK-2253
>             Project: Flink
>          Issue Type: Bug
>          Components: Machine Learning Library
>            Reporter: Till Rohrmann
>              Labels: ML
>
> If the {{temporaryPath}} of Flink's {{ALS}} implementation is set, then the ALS job is executed one part after the other. This also includes the routing information calculation for the user and item blocks. If the input {{DataSet}} is calculated non-deterministically, e.g. if it's the result of a {{first}} operation, then the resulting routing information won't be consistent and ALS fails.
> A solution would be to pin the input {{DataSet}} so that it will only be executed once. Until we have this functionality, I propose to simply execute the user and item routing information at the same time.



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