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https://issues.apache.org/jira/browse/PHOENIX-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088416#comment-14088416
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Samarth Jain commented on PHOENIX-1143:
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NPE is one of the manifestations of the race conditions. There is other state
that we end up cleaning up in a ConnectionQueryServices.close() - sequences,
statsManager, metadata, HConnection etc. It would then be difficult to figure
out why an exception like "sequence not present" is happening or metadata NPE
or why stats were not available etc.
> Prevent race condition between creating phoenix connection and closing
> phoenix driver/connection query services.
> ----------------------------------------------------------------------------------------------------------------
>
> Key: PHOENIX-1143
> URL: https://issues.apache.org/jira/browse/PHOENIX-1143
> Project: Phoenix
> Issue Type: Bug
> Reporter: Samarth Jain
> Assignee: Samarth Jain
> Fix For: 5.0.0, 3.1, 4.1
>
> Attachments: PHOENIX-1143-3.0.patch
>
>
> The race condition manifests when the following NPE is thrown:
> {code}
> java.lang.NullPointerException
> Thrown-StackTrace: at
> org.apache.phoenix.jdbc.PhoenixConnection.<init>(PhoenixConnection.java:178)
> at
> org.apache.phoenix.query.ConnectionQueryServicesImpl.connect(ConnectionQueryServicesImpl.java:513)
> at
> org.apache.phoenix.jdbc.PhoenixEmbeddedDriver.connect(PhoenixEmbeddedDriver.java:116)
> {code}
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