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Ivan Bella commented on ACCUMULO-4502: -------------------------------------- OK, I believe you are correct. The seeks are synchronized as well as the readNext in the SourceSwitchingIterator so volatile should not help. I will decline the request and keep searching. > Called next when there is no top > -------------------------------- > > Key: ACCUMULO-4502 > URL: https://issues.apache.org/jira/browse/ACCUMULO-4502 > Project: Accumulo > Issue Type: Bug > Components: core, tserver > Affects Versions: 1.6.6 > Reporter: Ivan Bella > Assignee: Ivan Bella > Fix For: 1.7.3, 1.8.1, 2.0.0 > > Time Spent: 20m > Remaining Estimate: 0h > > This happens very rarely but we have seen the following exception (pulled > from a server running 1.6.4). Looking at the code I believe this condition > can still happen in 1.8.0: > java.util.concurrent.ExecutionException: java.lang.IllegalStateException: > Called next() when there is no top > ... > Caused by: java.lang.IllegalStateException: Called next() when there is no top > HeapIterator.next(HeapIterator.java: 77) > WrappingIterator.next(WrappingIterator.java: 96) > MemKeyConversionIterator.next(InMemoryMap.java:162) > SourceSwitchingIterator.readNext(SourceSwitchingIterator.java: 139) > SourceSwitchingIterator.next(SourceSwitchingIterator.java: 123) > PartialMutationSkippingIterator.consume(InMemoryMap.java:108) > SkippingIterator.seek(SkippingIterator.java:43) -- This message was sent by Atlassian JIRA (v6.3.4#6332)