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https://issues.apache.org/jira/browse/STORM-3319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated STORM-3319:
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Labels: pull-request-available (was: )
> Slot can fail assertions in some cases
> --------------------------------------
>
> Key: STORM-3319
> URL: https://issues.apache.org/jira/browse/STORM-3319
> Project: Apache Storm
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Stig Rohde Døssing
> Assignee: Stig Rohde Døssing
> Priority: Major
> Labels: pull-request-available
>
> {quote}
> 2019-01-19 22:47:03.045 [SLOT_1024] ERROR
> org.apache.storm.daemon.supervisor.Slot - Error when processing event
> java.lang.AssertionError: null
> at org.apache.storm.daemon.supervisor.Slot.handleEmpty(Slot.java:781)
> ~[classes/:?]
> at
> org.apache.storm.daemon.supervisor.Slot.stateMachineStep(Slot.java:217)
> ~[classes/:?]
> at org.apache.storm.daemon.supervisor.Slot.run(Slot.java:900)
> [classes/:?]
> 2019-01-19 22:47:03.045 [SLOT_1025] ERROR
> org.apache.storm.daemon.supervisor.Slot - Error when processing event
> java.lang.AssertionError: null
> at org.apache.storm.daemon.supervisor.Slot.handleEmpty(Slot.java:781)
> ~[classes/:?]
> at
> org.apache.storm.daemon.supervisor.Slot.stateMachineStep(Slot.java:217)
> ~[classes/:?]
> at org.apache.storm.daemon.supervisor.Slot.run(Slot.java:900)
> [classes/:?]
> {quote}
> The issue is that Slot tries to go from WAITING_FOR_LOCALIZATION to EMPTY
> when there's an exception downloading a blob. It then fails one of the
> assertions in EMPTY because it doesn't clear its
> pendingChangingBlobsAssignment field.
> There's no reason to go back to EMPTY. The Slot still wants to download some
> blobs, so it should just restart the downloads and go back to
> WAITING_FOR_LOCALIZATION.
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