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https://reviews.apache.org/r/72330/
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Review request for atlas, Madhan Neethiraj, Nikhil Bonte, and Nixon Rodrigues.


Bugs: ATLAS-3715
    https://issues.apache.org/jira/browse/ATLAS-3715


Repository: atlas


Description
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**Approach**
- Create a new flag within _RequestContext_ that indicates if migration import 
is in progress.
- Refactored _mapPrimitiveAttribute_ to not create 
_AtlasAttributeMutationContext_ for primitive attributes. The new method is 
used in entity and relationship mapping.
- Within _mapPrimitiveAttribute_ skip setting the uniqueProperty name. 

**Reason**
- Setting this property causes a lock to be applied, which causes regular 
operations to be paused. This causes throughput to be reduced by over 75%.
- This attribute would be handled post-upgrade of this attribute via the 
_UniqueAttributePatch_.


Diffs
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repository/src/main/java/org/apache/atlas/repository/store/graph/v2/EntityGraphMapper.java
 0d5b6314d 
  
repository/src/main/java/org/apache/atlas/repository/store/graph/v2/bulkimport/pc/EntityConsumer.java
 e0a457334 
  server-api/src/main/java/org/apache/atlas/RequestContext.java 282a66f1d 


Diff: https://reviews.apache.org/r/72330/diff/1/


Testing
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**Volume test**
Enable metric log.
Baseline: 25 secs.
New: 2 secs.
```
atlas.migration.mode.batch.size=700
atlas.migration.mode.workers=24
````


Thanks,

Ashutosh Mestry

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