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From "Mihir Monani (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-5266) Client can only write on Index Table and skip data table if failure happens because of region split/move etc
Date Thu, 02 May 2019 10:33:00 GMT
Mihir Monani created PHOENIX-5266:
-------------------------------------

             Summary: Client can only write on Index Table and skip data table if failure
happens because of region split/move etc
                 Key: PHOENIX-5266
                 URL: https://issues.apache.org/jira/browse/PHOENIX-5266
             Project: Phoenix
          Issue Type: Bug
    Affects Versions: 4.14.1, 4.14.2
            Reporter: Mihir Monani
            Assignee: Mihir Monani


With Phoenix 4.14.1 client, There is a scenario where client would skip data table write but
do successful index table write. In this case, we should treat it as Data loss scenario.

 

Relevant code path :-

https://github.com/apache/phoenix/blob/4.x-HBase-1.3/phoenix-core/src/main/java/org/apache/phoenix/execute/MutationState.java#L994-L1043

https://github.com/apache/phoenix/blob/4.x-HBase-1.3/phoenix-core/src/main/java/org/apache/phoenix/execute/MutationState.java#L1089-L1109

 

Here is what happens :-
 * Consider below assumptions for scenario :- 
 ** max no row in single batch = 100
 ** max size of batch = 2 MB
 * When client faces SQLException Code 1121, it sets variable shouldRetryIndexedMutation=true.
 * In scenarios where client sends batch of 100 rows only as per configuration, but batch
size is >2 MB, MutationState.java#978 will split this 100 row batch into multiple smaller
batches which are <2MB.
 * Suppose there are 5 batches of 20 rows but client faces 1121 SQLExceptionCode on 2nd batch
, then it will set shouldRetryIndexedMutation=true and it will retry all 5 batches again with
only Index updates. This will results in rows missing from Data table.



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