[jira] [Resolved] (IMPALA-9045) Filter base directories of open/aborted compactions

["Zoltán Borók-Nagy (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-9045?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltán Borók-Nagy resolved IMPALA-9045.
---------------------------------------
    Fix Version/s: Impala 3.4.0
       Resolution: Fixed

> Filter base directories of open/aborted compactions
> ---------------------------------------------------
>
>                 Key: IMPALA-9045
>                 URL: https://issues.apache.org/jira/browse/IMPALA-9045
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Frontend
>    Affects Versions: Impala 3.3.0
>            Reporter: Csaba Ringhofer
>            Assignee: Zoltán Borók-Nagy
>            Priority: Critical
>              Labels: impala-acid
>             Fix For: Impala 3.4.0
>
>
> Major compactions creates directories in base_writeid_visibilityTxnId, which expresses that it contains all deltas +bases <= writeId, and that the compaction's transaction is visibilityTxnId. visibilityTxnId is needed to check whether the compaction is open/aborted/committed, and base directories belonging to open/aborted compactions should be ignored.
> Currently Impala only checks the writeId, so if there is an open/aborted compaction, it will be used as base, and base/delta directories with smaller writeIds will be ignored, leading to potential data loss.



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