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https://issues.apache.org/jira/browse/USERGRID-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Johnson closed USERGRID-1253.
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> Investigate and Refactor WriteUniqueVerify
> ------------------------------------------
>
> Key: USERGRID-1253
> URL: https://issues.apache.org/jira/browse/USERGRID-1253
> Project: Usergrid
> Issue Type: Story
> Reporter: Michael Russo
> Assignee: David Johnson
>
> Seeing a lot of exceptions like the following which indicate that the current
> workflow for writing and validating unique values (e.g. name/username/email
> properties):
> Caused by: java.lang.RuntimeException: Could not retrieve unique value for
> field email, unable to verify
> at
> org.apache.usergrid.persistence.collection.mvcc.stage.write.WriteUniqueVerify$ConsistentReplayCommand.executeStrategy(WriteUniqueVerify.java:201)
> at
> org.apache.usergrid.persistence.collection.mvcc.stage.write.WriteUniqueVerify$ConsistentReplayCommand.run(WriteUniqueVerify.java:173)
> at
> org.apache.usergrid.persistence.collection.mvcc.stage.write.WriteUniqueVerify$ConsistentReplayCommand.run(WriteUniqueVerify.java:150)
> at com.netflix.hystrix.HystrixCommand$1.call(HystrixCommand.java:294)
> ... 21 more
> Caused by: rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting
> onNext value:
> org.apache.usergrid.persistence.collection.mvcc.stage.CollectionIoEvent.class
> at
> rx.exceptions.OnErrorThrowable.addValueAsLastCause(OnErrorThrowable.java:104)
> at
> rx.internal.operators.OperatorDoOnEach$1.onNext(OperatorDoOnEach.java:81)
> at
> rx.internal.util.ScalarSynchronousObservable$ScalarSynchronousAction.call(ScalarSynchronousObservable.java:115)
> at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
> at
> rx.schedulers.ExecutorScheduler$ExecutorSchedulerWorker.run(ExecutorScheduler.java:98)
> We should see how to improve this so we can handle unique values at scale
> (likely introducing something like akka with consistent hash routing of the
> write operation).
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