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https://issues.apache.org/jira/browse/HIVE-20258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16591958#comment-16591958
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Vihang Karajgaonkar commented on HIVE-20258:
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+1
cc: [~thejas] [~vgumashta] who are more familiar with ReplManager.
> Should Syncronize getInstance in ReplChangeManager
> --------------------------------------------------
>
> Key: HIVE-20258
> URL: https://issues.apache.org/jira/browse/HIVE-20258
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Affects Versions: 3.0.0, 4.0.0
> Reporter: BELUGA BEHR
> Assignee: BELUGA BEHR
> Priority: Minor
> Attachments: HIVE-20258.1.patch
>
>
> {code:java}
> public static ReplChangeManager getInstance(Configuration conf) throws
> MetaException {
> if (instance == null) {
> instance = new ReplChangeManager(conf);
> }
> return instance;
> }
> {code}
> This method needs to be synchronized or two different threads may see a
> 'null' value and each create their own manager.
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