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https://issues.apache.org/jira/browse/ASTERIXDB-2118?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chen Luo resolved ASTERIXDB-2118.
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Resolution: Fixed
> Newer Memory Component gets flushed to disk first
> -------------------------------------------------
>
> Key: ASTERIXDB-2118
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-2118
> Project: Apache AsterixDB
> Issue Type: Bug
> Components: STO - Storage
> Reporter: Chen Luo
> Assignee: Chen Luo
>
> Currently we have two memory components, say M1 and M2, as double buffering.
> The AysnchronousScheduler needs to guarantee M1 and M2 are flushed in a
> proper order. However, the current scheduler is buggy. Consider the following
> event sequences.
> 1. M1 is full
> 2. schedule flush M1
> 3. activate M2
> 4. M2 is full
> 5. schedule flush M2 (cannot be scheduled since M1 is flushing)
> 6. A merge operation is finished
> At this moment, line 59 of AysnchronousScheduler is executed, and it
> schedules M2.
> Thus, M2 could be finished earlier before M1, resulting in wrong order of
> flushed disk components on disk.
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