[jira] [Resolved] (REEF-1412) Use a two-file approach for DFSEvaluatorLogOverwriteWriter

["Markus Weimer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/REEF-1412?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Markus Weimer resolved REEF-1412.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 0.16

Resolved via [#1023|https://github.com/apache/reef/pull/1023]

> Use a two-file approach for DFSEvaluatorLogOverwriteWriter
> ----------------------------------------------------------
>
>                 Key: REEF-1412
>                 URL: https://issues.apache.org/jira/browse/REEF-1412
>             Project: REEF
>          Issue Type: Sub-task
>          Components: REEF Driver, REEF.NET Driver
>            Reporter: Andrew Chung
>            Assignee: Andrew Chung
>             Fix For: 0.16
>
>
> A problem that needs to be addressed is that the {{DFSEvaluatorLogOverwriteWriter}} currently deletes the old EvaluatorChangesLog prior to writing the new one. Instead, we should use a two-file approach, where an alternative file, EvaluatorChangesLog.alt, is used in tandem with EvaluatorChangesLog.
> On read, the newest between EvaluatorChangesLog and EvaluatorChangesLog.alt should always be read. 
> On write, we always overwrite the older file between EvaluatorChangesLog and EvaluatorChangesLog.alt.



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