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https://issues.apache.org/jira/browse/BEAM-3949?focusedWorklogId=106672&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-106672
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ASF GitHub Bot logged work on BEAM-3949:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 29/May/18 15:15
            Start Date: 29/May/18 15:15
    Worklog Time Spent: 10m 
      Work Description: kkucharc commented on a change in pull request #5434: 
[BEAM-3949] IOIT's setup() and teardown() db connection attempt sometimes fail 
resulting in test flakiness
URL: https://github.com/apache/beam/pull/5434#discussion_r191464726
 
 

 ##########
 File path: 
sdks/java/io/common/src/test/java/org/apache/beam/sdk/io/common/IOITHelper.java
 ##########
 @@ -36,4 +42,55 @@ public static String getHashForRecordCount(int recordCount, 
Map<Integer, String>
     }
     return hash;
   }
+
+  public static void retry(RetryFunction function, int attempts, long delay)
 
 Review comment:
   Well, I know this looks a little bit messy but I find it most `clear` way to 
do this.
   There are two other options:
   * Callable - it requires to have result in return. That way for example in 
JdbcIOIT, the method `createTable` has to return Void. In my opinion this looks 
worse:
   ```
   Void createTable() throws SQLException {
       DatabaseTestHelper.createTable(...);
       return null;
     }
   ```
   * Runnable - this is from old Java and it doesn't throws Exceptions. In that 
case if any developer who would like use our `retry()` will have to surround 
body of lambda with try catch.
   
   In current state, the `RetryFunction` here is our custom `Runnable` which 
throws Exception and doesn't require result message.
   
   For now I can't find any better solution. 
   Maybe cleaner will be moving interface to `IOITHelper`? What do you think?

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 106672)
    Time Spent: 5h  (was: 4h 50m)

> IOIT's setup() and teardown() db connection attempt sometimes fail resulting 
> in test flakiness
> ----------------------------------------------------------------------------------------------
>
>                 Key: BEAM-3949
>                 URL: https://issues.apache.org/jira/browse/BEAM-3949
>             Project: Beam
>          Issue Type: Sub-task
>          Components: testing
>            Reporter: Łukasz Gajowy
>            Assignee: Kasia Kucharczyk
>            Priority: Major
>          Time Spent: 5h
>  Remaining Estimate: 0h
>
> setup() and teardown() methods sometimes have trouble connecting database in 
> Performance tests. It results in test flakiness. 
> Example logs: 
> [https://builds.apache.org/view/A-D/view/Beam/job/beam_PerformanceTests_HadoopInputFormat/65/console]



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