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https://issues.apache.org/jira/browse/HBASE-7384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeffrey Zhong updated HBASE-7384:
---------------------------------
Attachment: hbase-7384.patch
This patch is a baby step towards on flaky tests. Most flaky tests I found
especially for cross platform tests are due to not long enough hard coded time
out values. It would be much more pleasant if we can easily identify premature
time out situations and adjust max time out values dynamically by a system
property according to different environment needs.
I migrated two test cases to use the new waitFor functions as an example. The
new waitFor function will fully benefit us after we migrate all old test cases
and use the new waitFor pattern for future test cases.
Thanks,
-Jeffrey
> Introducing waitForCondition function into test cases
> -----------------------------------------------------
>
> Key: HBASE-7384
> URL: https://issues.apache.org/jira/browse/HBASE-7384
> Project: HBase
> Issue Type: Test
> Components: test
> Reporter: Jeffrey Zhong
> Assignee: Jeffrey Zhong
> Attachments: hbase-7384.patch, Waiter.java
>
>
> Recently I'm working on flaky test cases and found we have many places using
> while loop and sleep to wait for a condition to be true. There are several
> issues in existing ways:
> 1) Many similar code doing the same thing
> 2) When time out happens, different errors are reported without explicitly
> indicating a time out situation
> 3) When we want to increase the max timeout value to verify if a test case
> fails due to a not-enough time out value, we have to recompile & redeploy code
> I propose to create a waitForCondition function as a test utility function
> like the following:
> {code}
> public interface WaitCheck {
> public boolean Check() ;
> }
> public boolean waitForCondition(int timeOutInMilliSeconds, int
> checkIntervalInMilliSeconds, WaitCheck s)
> throws InterruptedException {
> int multiplier = 1;
> String multiplierProp = System.getProperty("extremeWaitMultiplier");
> if(multiplierProp != null) {
> multiplier = Integer.parseInt(multiplierProp);
> if(multiplier < 1) {
> LOG.warn(String.format("Invalid extremeWaitMultiplier
> property value:%s. is ignored.", multiplierProp));
> multiplier = 1;
> }
> }
> int timeElapsed = 0;
> while(timeElapsed < timeOutInMilliSeconds * multiplier) {
> if(s.Check()) {
> return true;
> }
> Thread.sleep(checkIntervalInMilliSeconds);
> timeElapsed += checkIntervalInMilliSeconds;
> }
> assertTrue("WaitForCondition failed due to time out(" +
> timeOutInMilliSeconds + " milliseconds expired)",
> false);
> return false;
> }
> {code}
> By doing the above way, there are several advantages:
> 1) Clearly report time out error when such situation happens
> 2) Use System property extremeWaitMultiplier to increase max time out
> dynamically for a quick verification
> 3) Standardize current wait situations
> Pleas let me know what your thoughts on this.
> Thanks,
> -Jeffrey
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