[ 
https://issues.apache.org/jira/browse/GEODE-10011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Donal Evans updated GEODE-10011:
--------------------------------
    Description: 
{noformat}
SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest > 
scanWithNoModificationsDoesNotReturnDuplicates FAILED
    java.lang.AssertionError: Property named 
'scanWithNoModificationsDoesNotReturnDuplicates' failed (
    Expected size: 2 but was: 4 in:
    [176, 55, 176, 55]):
    With arguments: [[176, 55]]
    Original failure message: 
    Expected size: 2 but was: 4 in:
    [55, 202, 55, 202]
    First arguments found to also provoke a failure: [[55, 202]]
    Seeds for reproduction: [5487908098719980972]
        at 
org.apache.geode.redis.internal.data.collections.SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.scanWithNoModificationsDoesNotReturnDuplicates(SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.java:85)

        Caused by:
        java.lang.AssertionError: 
        Expected size: 2 but was: 4 in:
        [55, 202, 55, 202]
            at 
org.apache.geode.redis.internal.data.collections.SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.scanWithNoModificationsDoesNotReturnDuplicates(SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.java:85){noformat}
This failure is due to the test assuming that more than one scan is necessary 
to scan the entire map, but for small map sizes (the map in the failure above 
only has 2 keys) it's possible that the first scan will return all elements and 
a cursor value of 0, meaning that the second scan will also return all 
elements, leading to duplicate elements in the result.

  was:
{noformat}
SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest > 
scanWithNoModificationsDoesNotReturnDuplicates FAILED
    java.lang.AssertionError: Property named 
'scanWithNoModificationsDoesNotReturnDuplicates' failed (
    Expected size: 2 but was: 4 in:
    [176, 55, 176, 55]):
    With arguments: [[176, 55]]
    Original failure message: 
    Expected size: 2 but was: 4 in:
    [55, 202, 55, 202]
    First arguments found to also provoke a failure: [[55, 202]]
    Seeds for reproduction: [5487908098719980972]
        at 
org.apache.geode.redis.internal.data.collections.SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.scanWithNoModificationsDoesNotReturnDuplicates(SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.java:85)

        Caused by:
        java.lang.AssertionError: 
        Expected size: 2 but was: 4 in:
        [55, 202, 55, 202]
            at 
org.apache.geode.redis.internal.data.collections.SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.scanWithNoModificationsDoesNotReturnDuplicates(SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.java:85){noformat}
This failure is due to the test assuming that more than one scan is necessary 
to scan the entire set, but for small set sizes (the set in the failure above 
only has 2 members) it's possible that the first scan will return all elements 
and a cursor value of 0, meaning that the second scan will also return all 
elements, leading to duplicate elements in the result.


> SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.scanWithNoModificationsDoesNotReturnDuplicates
>  is flaky
> ---------------------------------------------------------------------------------------------------------------------
>
>                 Key: GEODE-10011
>                 URL: https://issues.apache.org/jira/browse/GEODE-10011
>             Project: Geode
>          Issue Type: Bug
>          Components: redis
>    Affects Versions: 1.15.0, 1.16.0
>            Reporter: Donal Evans
>            Assignee: Donal Evans
>            Priority: Major
>
> {noformat}
> SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest > 
> scanWithNoModificationsDoesNotReturnDuplicates FAILED
>     java.lang.AssertionError: Property named 
> 'scanWithNoModificationsDoesNotReturnDuplicates' failed (
>     Expected size: 2 but was: 4 in:
>     [176, 55, 176, 55]):
>     With arguments: [[176, 55]]
>     Original failure message: 
>     Expected size: 2 but was: 4 in:
>     [55, 202, 55, 202]
>     First arguments found to also provoke a failure: [[55, 202]]
>     Seeds for reproduction: [5487908098719980972]
>         at 
> org.apache.geode.redis.internal.data.collections.SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.scanWithNoModificationsDoesNotReturnDuplicates(SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.java:85)
>         Caused by:
>         java.lang.AssertionError: 
>         Expected size: 2 but was: 4 in:
>         [55, 202, 55, 202]
>             at 
> org.apache.geode.redis.internal.data.collections.SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.scanWithNoModificationsDoesNotReturnDuplicates(SizeableBytes2ObjectOpenCustomHashMapWithCursorQuickCheckTest.java:85){noformat}
> This failure is due to the test assuming that more than one scan is necessary 
> to scan the entire map, but for small map sizes (the map in the failure above 
> only has 2 keys) it's possible that the first scan will return all elements 
> and a cursor value of 0, meaning that the second scan will also return all 
> elements, leading to duplicate elements in the result.



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