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From "Apoorv Naik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ATLAS-2816) Allow ignoring relationship in EntityGraphRetriever for FullTextMapperV2
Date Thu, 09 Aug 2018 20:01:00 GMT

    [ https://issues.apache.org/jira/browse/ATLAS-2816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16575327#comment-16575327
] 

Apoorv Naik commented on ATLAS-2816:
------------------------------------

Please submit a patch or create a review on reviewboard with suggested changes.

> Allow ignoring relationship in EntityGraphRetriever for FullTextMapperV2
> ------------------------------------------------------------------------
>
>                 Key: ATLAS-2816
>                 URL: https://issues.apache.org/jira/browse/ATLAS-2816
>             Project: Atlas
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: Chengbing Liu
>            Priority: Major
>
> We encountered a problem when using Hive bridge in production. One database has 5000+
tables. Importing the first table costs only tens of milliseconds, and then it becomes slower
with more tables. In the end, it costs 1~2 seconds to import one table.
> After investigation, we realized that it is not necessary for the {{FullTextMapperV2}}
to retrieve all the relationship of the database each time a table is imported. The time complexity
of importing a whole database actually goes to O(n^2) (n is number of tables).
> We propose to add a parameter to the constructor of {{EntityGraphRetriever}}: {{ignoreRelationship}}.
When set to true, {{mapVertexToAtlasEntity}} will skip the {{mapRelationshipAttributes}} call.
Since {{FullTextMapperV2}} will not use relationship attributes of the entity, this can save
plenty of time when importing entities with a large number of relations.



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