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https://issues.apache.org/jira/browse/HUDI-3495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17506676#comment-17506676
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Raymond Xu commented on HUDI-3495:
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[~zhangyue19921010] any update?
> Reading keys in parallel from HoodieMetadataMergedLogRecordReader may lead to
> empty results even if key exists
> --------------------------------------------------------------------------------------------------------------
>
> Key: HUDI-3495
> URL: https://issues.apache.org/jira/browse/HUDI-3495
> Project: Apache Hudi
> Issue Type: Bug
> Components: metadata
> Reporter: Prashant Wason
> Assignee: Yue Zhang
> Priority: Blocker
> Fix For: 0.11.0
>
>
> [HoodieMetadataMergedLogRecordReader|https://github.com/apache/hudi/blob/master/hudi-common/src/main/java/org/apache/hudi/metadata/HoodieMetadataMergedLogRecordReader.java]
> has two function which lookup keys:
> getRecordByKey(String key) - lookups the key in member variable map "records"
> getRecordsByKeys(List<String> keys) - clears member variable map "records"
> and scans the log files again.
> If the two functions are called in parallel, the getRecordByKey() may return
> an empty key because the records was cleared in another thread calling
> getRecordsByKeys()
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