[jira] [Created] (HBASE-25108) checkAndPut (or checkAndMutate) might return false when the row is mutated successfully

["Murilo Giacometti Rocha (Jira)" <ji...@apache.org>]

Murilo Giacometti Rocha created HBASE-25108:
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             Summary: checkAndPut (or checkAndMutate) might return false when the row is mutated successfully
                 Key: HBASE-25108
                 URL: https://issues.apache.org/jira/browse/HBASE-25108
             Project: HBase
          Issue Type: Bug
    Affects Versions: 1.2.11, 2.1.0
            Reporter: Murilo Giacometti Rocha


In the client, when the MutateRequest times out, we retry the operation in org.apache.hadoop.hbase.client.RpcRetryingCallerImpl#callWithRetries. If the server received the request but the client failed to get a response, the server returns processed=false  because the value is already there. So the value false is returned, even though the checkAndPut was successful.



In 2.1.0, I could only reproduce it three times by accident, but it always happened in 1.2.11. In 2.1.0, I could only reproduce it systematically by cleaning the response with the debugger before it got to the client.

Repro steps
 * Create a breakpoint in the exception in org.apache.hadoop.hbase.client.RpcRetryingCallerImpl#callWithRetries to make sure we get the exception and retry.
 * Create an infinite loop to create different rows with checkAndPut.
 * Start running with the disabled breakpoints.
 * Enable the breakpoint.
 * Pause all threads and verify that we are waiting for a response in the IPC thread. Wait for 1-2 minutes. This will cause a timeout. 

 * Continue and verify that an exception is triggered.
 * Add a breakpoint to verify the response.
 * Continue and check the response and the returned value.



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