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https://issues.apache.org/jira/browse/IGNITE-8957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536910#comment-16536910
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Andrew Medvedev commented on IGNITE-8957:
-----------------------------------------

As I can see, lastEntry is absent only when cpPages == 0 and cpEntry == null 
for the first time, so no checkpoint is written. We also do not log checkpoint 
in 
org/apache/ignite/internal/processors/cache/persistence/GridCacheDatabaseSharedManager.java:3192
 since hasDelta == false

So we just exit early.

> testFailGetLock() constantly fails. Last entry checkpoint history can be empty
> ------------------------------------------------------------------------------
>
>                 Key: IGNITE-8957
>                 URL: https://issues.apache.org/jira/browse/IGNITE-8957
>             Project: Ignite
>          Issue Type: Bug
>          Components: persistence
>    Affects Versions: 2.7
>            Reporter: Maxim Muzafarov
>            Assignee: Andrew Medvedev
>            Priority: Major
>              Labels: MakeTeamcityGreenAgain
>
> IgniteChangeGlobalStateTest#testFailGetLock constantly fails with exception:
> {code}
> java.lang.AssertionError
>       at 
> org.apache.ignite.internal.processors.cache.persistence.checkpoint.CheckpointHistory.onCheckpointFinished(CheckpointHistory.java:205)
>       at 
> org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager$Checkpointer.markCheckpointEnd(GridCacheDatabaseSharedManager.java:3654)
>       at 
> org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager$Checkpointer.doCheckpoint(GridCacheDatabaseSharedManager.java:3178)
>       at 
> org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager$Checkpointer.body(GridCacheDatabaseSharedManager.java:2953)
>       at 
> org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:110)
>       at java.lang.Thread.run(Thread.java:748)
> {code}
> As Sergey Chugunov 
> [mentioned|https://issues.apache.org/jira/browse/IGNITE-8737?focusedCommentId=16535062&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16535062],
>  issue can be solved different ways:
> {quote}
> It seems we missed a case when lastEntry may be empty. We may choose here 
> from two options:
> * Check if histMap is empty inside onCheckpointFinished. If it is just don't 
> log anything (it was the very first checkpoint).
> * Check in caller that there is no history, calculate necessary index in 
> caller and pass it to onCheckpointFinished to prepare correct log 
> message.{quote}



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