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intg/src/main/java/org/apache/atlas/utils/FixedBufferList.java
Lines 85 (patched)
<https://reviews.apache.org/r/72666/#comment309968>

    Refactor to arrange methods such that public methods appear earlier to 
private methods.



webapp/src/main/java/org/apache/atlas/notification/EntityNotificationListenerV2.java
Lines 77 (patched)
<https://reviews.apache.org/r/72666/#comment309967>

    NamedFixedBufferList: Does not have a mechanism to remove objects


- Nikhil Bonte


On July 9, 2020, 6:17 p.m., Ashutosh Mestry wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/72666/
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> 
> (Updated July 9, 2020, 6:17 p.m.)
> 
> 
> Review request for atlas, Madhan Neethiraj, Nikhil Bonte, Nixon Rodrigues, 
> and Sarath Subramanian.
> 
> 
> Bugs: ATLAS-3878
>     https://issues.apache.org/jira/browse/ATLAS-3878
> 
> 
> Repository: atlas
> 
> 
> Description
> -------
> 
> **Background**
> See JIRA for details.
> 
> *Analysis* Using memory profiling tools, it was observed that large number of 
> notification objects were created. These stayed in memory and later were 
> promoted to higher generation, thereby taking even longer to be collected.
> 
> **Approach**
> Using the fixed-buffer approach to address the problem of creating large 
> number of small objects.
> 
> New *FixedBufferList* This is an encapsulation over *ArrayList*. During 
> initial allocation, list is populated with default values. Features:
> - Setting of values to these pre-allocated objects is achieved by first doing 
> a *get* on the element and then assigning values to it.
> - *toList* fetches the sub-list from the encapsulating list. This uses the 
> state within the class to fetch the right length for the returning array.
> 
> New *NamedFixedBufferList* Maintains a per-thread *FixedBufferList*. This is 
> necessary since the list is now part class's state.
> Modified *EntityAuditListenerV2* Uses the new classes.
> Modifed *EntityNotificationListener* Uses the new classes.
> 
> **Verification**
> - Using the test setup, the memory usage was observed over a period of 24 
> hrs. 
> - Memory usage and object allocation was obvserved using memory profiler.
> 
> 
> Diffs
> -----
> 
>   intg/src/main/java/org/apache/atlas/utils/FixedBufferList.java PRE-CREATION 
>   intg/src/main/java/org/apache/atlas/utils/NamedFixedBufferList.java 
> PRE-CREATION 
>   intg/src/test/java/org/apache/atlas/utils/FixedBufferListTest.java 
> PRE-CREATION 
>   
> repository/src/main/java/org/apache/atlas/repository/audit/EntityAuditListenerV2.java
>  79527acfa 
>   
> webapp/src/main/java/org/apache/atlas/notification/EntityNotificationListenerV2.java
>  a677b315c 
> 
> 
> Diff: https://reviews.apache.org/r/72666/diff/2/
> 
> 
> Testing
> -------
> 
> **Unit testing**
> Unit tests added for the new classes.
> 
> **Volume testing**
> Setup:
> - Node: Threads 40, Core: 40, Allocated Memory: 12 GB
> - Multiple Kafka queues ingesting data.
> - Bulk entity creation using custom script ingesting 100M entities.
> 
> Memory usage stayed between 0 and 5% during the 24 hr period.
> 
> **Pre-commit**
> https://builds.apache.org/view/A/view/Atlas/job/PreCommit-ATLAS-Build-Test/2035/
> 
> 
> Thanks,
> 
> Ashutosh Mestry
> 
>

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