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From "Chengbing Liu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ATLAS-2816) Allow ignoring relationship in EntityGraphRetriever for FullTextMapperV2
Date Wed, 08 Aug 2018 09:10:00 GMT
Chengbing Liu created ATLAS-2816:
------------------------------------

             Summary: 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


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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