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https://issues.apache.org/jira/browse/CASSANDRA-13738?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Jay Zhuang updated CASSANDRA-13738:
-----------------------------------
    Description: 
For example, here is one of our cluster with about 500GB per node, but 
{{nodetool status}} shows far more load than it actually is and keeps 
increasing:
{noformat}
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens       Owns (effective)  Host ID            
                   Rack
UN  IP1*****       13.52 TB   256          100.0%            
c4c31e0a-3f01-49f7-8a22-33043737975d  rac1
UN  IP2*****       14.25 TB   256          100.0%            
efec4980-ec9e-4424-8a21-ce7ddaf80aa0  rac1
UN  IP3*****       13.52 TB   256          100.0%            
7dbcfdfc-9c07-4b1a-a4b9-970b715ebed8  rac1
UN  IP4*****       22.13 TB   256          100.0%            
8879e6c4-93e3-4cc5-b957-f999c6b9b563  rac1
UN  IP5*****       18.02 TB   256          100.0%            
4a1eaf22-4a83-4736-9e1c-12f898d685fa  rac1
UN  IP6*****       11.68 TB   256          100.0%            
d633c591-28af-42cc-bc5e-47d1c8bcf50f  rac1
{noformat}

!sizeIssue.png|test!

The root cause is if the SSTable index summary is redistributed (typically 
executes hourly), the updated SSTable size is added again.

  was:
For example, here is one of our cluster with about 500GB per node, but 
{{nodetool status}} shows far more load than it actually is and keeps 
increasing:
{noformat}
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens       Owns (effective)  Host ID            
                   Rack
UN  IP1*****       13.52 TB   256          100.0%            
c4c31e0a-3f01-49f7-8a22-33043737975d  rac1
UN  IP2*****       14.25 TB   256          100.0%            
efec4980-ec9e-4424-8a21-ce7ddaf80aa0  rac1
UN  IP3*****       13.52 TB   256          100.0%            
7dbcfdfc-9c07-4b1a-a4b9-970b715ebed8  rac1
UN  IP4*****       22.13 TB   256          100.0%            
8879e6c4-93e3-4cc5-b957-f999c6b9b563  rac1
UN  IP5*****       18.02 TB   256          100.0%            
4a1eaf22-4a83-4736-9e1c-12f898d685fa  rac1
UN  IP6*****       11.68 TB   256          100.0%            
d633c591-28af-42cc-bc5e-47d1c8bcf50f  rac1
{noformat}

!sizeIssue.png|thumbnail!

The root cause is if the SSTable index summary is redistributed (typically 
executes hourly), the updated SSTable size is added again.


> Load is over calculated after each IndexSummaryRedistribution
> -------------------------------------------------------------
>
>                 Key: CASSANDRA-13738
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13738
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jay Zhuang
>            Assignee: Jay Zhuang
>             Fix For: 3.0.x, 3.11.x, 4.x
>
>         Attachments: sizeIssue.png
>
>
> For example, here is one of our cluster with about 500GB per node, but 
> {{nodetool status}} shows far more load than it actually is and keeps 
> increasing:
> {noformat}
> Status=Up/Down
> |/ State=Normal/Leaving/Joining/Moving
> --  Address        Load       Tokens       Owns (effective)  Host ID          
>                      Rack
> UN  IP1*****       13.52 TB   256          100.0%            
> c4c31e0a-3f01-49f7-8a22-33043737975d  rac1
> UN  IP2*****       14.25 TB   256          100.0%            
> efec4980-ec9e-4424-8a21-ce7ddaf80aa0  rac1
> UN  IP3*****       13.52 TB   256          100.0%            
> 7dbcfdfc-9c07-4b1a-a4b9-970b715ebed8  rac1
> UN  IP4*****       22.13 TB   256          100.0%            
> 8879e6c4-93e3-4cc5-b957-f999c6b9b563  rac1
> UN  IP5*****       18.02 TB   256          100.0%            
> 4a1eaf22-4a83-4736-9e1c-12f898d685fa  rac1
> UN  IP6*****       11.68 TB   256          100.0%            
> d633c591-28af-42cc-bc5e-47d1c8bcf50f  rac1
> {noformat}
> !sizeIssue.png|test!
> The root cause is if the SSTable index summary is redistributed (typically 
> executes hourly), the updated SSTable size is added again.



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