[jira] [Resolved] (SPARK-21596) Audit the places calling HDFSMetadataLog.get

["Shixiong Zhu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21596?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shixiong Zhu resolved SPARK-21596.
----------------------------------
       Resolution: Fixed
         Assignee: Shixiong Zhu
    Fix Version/s: 2.3.0
                   2.2.1

> Audit the places calling HDFSMetadataLog.get
> --------------------------------------------
>
>                 Key: SPARK-21596
>                 URL: https://issues.apache.org/jira/browse/SPARK-21596
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.1.1
>            Reporter: Shixiong Zhu
>            Assignee: Shixiong Zhu
>             Fix For: 2.2.1, 2.3.0
>
>
> When I was investigating a flaky test, I realized that many places don't check the return value of `HDFSMetadataLog.get(batchId: Long): Option[T]`. When a batch is supposed to be there, the caller just ignores None rather than throwing an error. If some bug causes a query doesn't generate a batch metadata file, this behavior will hide it and allow the query continuing to run.



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