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Posted to issues@ignite.apache.org by "Yaroslav Molochkov (Jira)" <ji...@apache.org> on 2020/11/03 15:13:00 UTC
[jira] [Updated] (IGNITE-13382) DurableBackgroundTask can abandon
incomplete task
[ https://issues.apache.org/jira/browse/IGNITE-13382?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yaroslav Molochkov updated IGNITE-13382:
----------------------------------------
Fix Version/s: 2.9.1
> DurableBackgroundTask can abandon incomplete task
> -------------------------------------------------
>
> Key: IGNITE-13382
> URL: https://issues.apache.org/jira/browse/IGNITE-13382
> Project: Ignite
> Issue Type: Bug
> Affects Versions: 2.7
> Reporter: Maria Makedonskaya
> Assignee: Maria Makedonskaya
> Priority: Major
> Labels: 2.9.1-rc
> Fix For: 2.10, 2.9.1
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> DurableBackgroundTasks are tracked using metastorage, there's a specific marker for every task, and it is removed right after the task is complete.
> But there's a race between checkpointer and metastorage. End-marker removal is a logical operation, while task itself is mostly physical (at least the existing one). So, following scenario is possible:
> * Checkpoint occurs in the middle of the task;
> * Task is completed before the next checkpoint;
> * Metastorage record is deleted, this fact if written to WAL and synced to the storage;
> * Node failed;
> * Recovery process applies deletion from metastorage, this means that DurableBackgroundTasks info is lost;
> * But part of the index is still present in the storage.
> I think that we should remove markers from metastorage only after the next checkpoint, this will 100% save us from such situation.
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