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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/65779/
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Review request for atlas, Apoorv Naik, Madhan Neethiraj, and Ruchi Solani.


Bugs: ATLAS-2460
    https://issues.apache.org/jira/browse/ATLAS-2460


Repository: atlas


Description
-------

**Background**
This implementation deals with the 'import into' part of the data migration 
process. 

It assumes:
- Export from older cluster is done.
- Generated file has been moved to newer cluster.

**Implementation**

During _Atlas_ server startup, the configuration parameter is checked, if that 
parameter exists, all services except _DataMigrationService_ is started. 
Migration is started. Atlas server is available in _MIGRATION_ mode. It 
processes REST calls made only to the _AdminResource_.

Here's are the udpates:
- New configuration parameter has been added:
    _atlas.migration.mode.filename=<name of the file to be imported>_
  This configuration parameter is set by Ambari as part of its migration 
orchestration. 
- _DataMigrationService_: New service that performs async migration as soon as 
Atlas server starts up.
- _ImportProgressTracker_: Added to be able to query progress of import.
- _ImportService_: Modified to send updates to _ImportProgressTracker_.
- _AdminResource.getStatus()_ Now supplies additional status about migration.
- _ServiceState_ Modified to carry additional status _MIGRATION_. This status 
is set by looking at the configuration parameter above.
- _AtlasEntityStoreV1_ modified to block sending out notifications during 
migration.
- _Services_ modified for special handling of _DataMigrationService_.


**CURL**
Check status using:
```
curl -X GET -u admin:admin -H "Content-Type: application/json" -H 
"Cache-Control: no-cache" http://localhost:21000/api/atlas/admin/status
```


Diffs
-----

  common/src/main/java/org/apache/atlas/AtlasConstants.java f5de1df3 
  common/src/main/java/org/apache/atlas/service/Services.java 1267dc92 
  intg/src/main/java/org/apache/atlas/model/impexp/AtlasExportResult.java 
1ea961d8 
  intg/src/main/java/org/apache/atlas/model/impexp/AtlasImportResult.java 
b97cbb3f 
  
repository/src/main/java/org/apache/atlas/repository/impexp/DataMigrationService.java
 PRE-CREATION 
  
repository/src/main/java/org/apache/atlas/repository/impexp/ImportProgressTracker.java
 PRE-CREATION 
  
repository/src/main/java/org/apache/atlas/repository/impexp/ImportService.java 
c976c593 
  
repository/src/main/java/org/apache/atlas/repository/store/graph/v1/AtlasEntityStoreV1.java
 bf417dd0 
  
repository/src/main/java/org/apache/atlas/repository/store/graph/v1/BulkImporterImpl.java
 af310954 
  
repository/src/main/java/org/apache/atlas/repository/store/graph/v1/EntityGraphMapper.java
 0ba06b94 
  
repository/src/test/java/org/apache/atlas/repository/impexp/ExportServiceTest.java
 07524d08 
  
repository/src/test/java/org/apache/atlas/repository/store/graph/v1/AtlasEntityStoreV1Test.java
 f4b70531 
  
repository/src/test/java/org/apache/atlas/repository/store/graph/v1/AtlasRelationshipStoreV1Test.java
 8de978c8 
  webapp/src/main/java/org/apache/atlas/Atlas.java 7cf6e3ea 
  webapp/src/main/java/org/apache/atlas/web/resources/AdminResource.java 
86485fba 
  webapp/src/main/java/org/apache/atlas/web/service/ServiceState.java 3fe8d18c 
  webapp/src/test/java/org/apache/atlas/web/resources/AdminResourceTest.java 
fd96fc3d 


Diff: https://reviews.apache.org/r/65779/diff/1/


Testing
-------

**Unit tests**
None added.

**Functional tests**
Steps to test:
- Place the exported file say _export-1.zip_ at _/root_
- Add to _Atlas_ Ambari's customer property:
    _atlas.migration.mode.filename=/root/export-1.zip_
- Ambari will prompt for a restart. Restart Atlas.
- On the server view the progress in the logs using: _tail -f 
/var/log/atlas/application.log_
- Use the CURL call mentioned above and view the status and the progress of the 
import.


Thanks,

Ashutosh Mestry

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