David Handermann created NIFI-11191:
---------------------------------------

             Summary: Intermittent Failures in HikariCPConnectionPoolTest
                 Key: NIFI-11191
                 URL: https://issues.apache.org/jira/browse/NIFI-11191
             Project: Apache NiFi
          Issue Type: Bug
          Components: Extensions
            Reporter: David Handermann
            Assignee: David Handermann


The {{HikariCPConnectionPoolTest}} fails intermittently due to timeouts when 
attempting to retrieve a connection from the file-backed Derby Data Source:

{noformat}
Caused by: java.sql.SQLTimeoutException: Login timeout exceeded.
        at 
org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
        at 
org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
        at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown 
Source)
        at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown 
Source)
        at org.apache.derby.jdbc.InternalDriver.timeLogin(Unknown Source)
        at org.apache.derby.jdbc.InternalDriver.connect(Unknown Source)
        at org.apache.derby.jdbc.InternalDriver.connect(Unknown Source)
        at org.apache.derby.jdbc.EmbeddedDriver.connect(Unknown Source)
        at 
com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138)
        at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:364)
        at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:206)
        at 
com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:476)
        at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:561)
        at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115)
        at 
com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112)
        at 
org.apache.nifi.dbcp.HikariCPConnectionPool.getConnection(HikariCPConnectionPool.java:343)
        ... 72 more
Caused by: ERROR XBDA0: Login timeout exceeded.
        at org.apache.derby.iapi.error.StandardException.newException(Unknown 
Source)
        at 
org.apache.derby.impl.jdbc.SQLExceptionFactory.wrapArgsForTransportAcrossDRDA(Unknown
 Source)
        ... 88 more

Error:  Errors: 
Error:    HikariCPConnectionPoolTest.testCreateInsertSelect:172 Process 
Connection retrieval failed
 {noformat}

The problem appears to be related to file locking and concurrent test execution.



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