[jira] [Commented] (ATLAS-2888) Export & Import Process: Change Marker Removed Inadvertently

["Nixon Rodrigues (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ATLAS-2888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16625400#comment-16625400 ] 

Nixon Rodrigues commented on ATLAS-2888:
----------------------------------------

+1 for the patch, [~ashutoshm] for the patch.

> Export & Import Process: Change Marker Removed Inadvertently
> ------------------------------------------------------------
>
>                 Key: ATLAS-2888
>                 URL: https://issues.apache.org/jira/browse/ATLAS-2888
>             Project: Atlas
>          Issue Type: Bug
>            Reporter: Ashutosh Mestry
>            Assignee: Ashutosh Mestry
>            Priority: Major
>         Attachments: ATLAS-2888-REPL_DETAILS-entry-missing.patch
>
>
> *Background*
> When using _replicatedTo_ and _replicatedFrom_ options in _Export_ and _Import_ requests, the _AtlasServer_ stores a marker indicating the next starting point for export to being.
> *Steps to Duplicate*
>  * Setup _export-options.json_ as follows:
> {{_{_}}{{_"itemsToExport": [_}}{{_{ "typeName": "hive_db", "uniqueAttributes": \{ "qualifiedName": "stocks@cl1" }}_}}{{_],_}}{{_"options": {_}}{{_"fetchType": "incremental",_}}{{_"skipLineage": true,_}}{{_"changeMarker": 0,_}}{{_"replicatedTo": "SFO$clMain"_}}{{_}_}}{{_}_}} * Perform export using Export REST calls.
>  * Update _export-options.json_ with the _changeMarker_ from the _Atlas' application.log._
>  * Notice the _AtlasServer_ entry for _clMain_. It is updated with _changeMarker_ value from log.
>  * Perform export using Export REST API.
>  * Export will happen with no entities exported (since nothing was changed in the database). Atlas' application.log indicates new change maker.
> _Expected results:_ _AtlasServer_ for _clMain_ should continue displaying _REPL_DETAILS_ entry.
> _Observed results:_ _AtlasServer_ _for_ _clMain_ displays properties with _REPL_DETAILS_ entry removed. 
> *Root Cause*
> Within _AuditsWriter_, the entry for _clMain_ is saved 2 times. First without the change marker and then if export operation has entities exported, the server entity is saved with the change marker.
> If no entities, exist the server entry remains without the _REPL_DETAILS_ entry present.
> *Possible Fix*
> Save the target server entry only once.



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