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https://issues.apache.org/jira/browse/ATLAS-3762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17124288#comment-17124288
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ASF subversion and git services commented on ATLAS-3762:
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Commit 43c9e32c89263a8e98c98dccc47f6b5ae7a3ceba in atlas's branch
refs/heads/branch-2.0 from Ashutosh Mestry
[ https://gitbox.apache.org/repos/asf?p=atlas.git;h=43c9e32 ]
ATLAS-3762: Improve Edge creator using Genuine iterator.
(cherry picked from commit 25f3002e0e84927eb39cebb5708d77ef81755d79)
> Entity Creation: Improve Edges Fetch Between Vertices
> -----------------------------------------------------
>
> Key: ATLAS-3762
> URL: https://issues.apache.org/jira/browse/ATLAS-3762
> Project: Atlas
> Issue Type: Improvement
> Reporter: Ashutosh Mestry
> Assignee: Ashutosh Mestry
> Priority: Major
> Attachments: ATLAS-3762-Edge-fetch-improvement-gremlin.patch,
> ATLAS-3762-Improve-Edge-creator-using-Genuine-iterat.patch
>
>
> *Background*
> One of the earlier commits replaced vertices and edges fetch with
> _StreamSupport.stream_. This uses _Collect(toList),_ which causes all
> contents to be fetched.
> Using this causes large amount of data to be fetched.
> *Solution*
> Switch to iterators that will use lazy loading.
> *Edge Fetch Refactoring*
> Change the _getEdge_ to iterate on smaller dataset.
> Here are the scenarios:
> - _fromVertex_ is _hive_table_, _toVertex_ is _hive_column_. This means that
> outgoing edges from _fromVertex_ will be many more than incoming edges to
> _toVertex_.
> - _fromVertex_ is _hive_process_execution_, _toVertex_ is _hive_table_. This
> means that outgoing edges from _fromVertex_ will be fewer than incoming edges
> _hive_table_.
> Approach:
> * Search it is a linear search, it will be more efficient to iterate over
> fewer items than more items.
> * Fetch count edge items for _fromVertex_ and _toVertex_. If either of the
> count is 0, return NULL, since it will not result in anything being found.
> * If either of the counts is not 0, take the one with fewer elements and
> perform a search.
> [~sidharthkmishra] Thanks for this simple but effective fix.
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