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Posted to issues@beam.apache.org by "Luke Cwik (Jira)" <ji...@apache.org> on 2020/10/09 19:53:00 UTC
[jira] [Commented] (BEAM-11050) AggregatorCombiner reuses mutable
accumT across multiple merges leading to incorrect results
[ https://issues.apache.org/jira/browse/BEAM-11050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211316#comment-17211316 ]
Luke Cwik commented on BEAM-11050:
----------------------------------
Turns out the issue is that the accumulator is being reused across windows and the combine fn is mutating it so those mutations are appearing in the wrong window.
> AggregatorCombiner reuses mutable accumT across multiple merges leading to incorrect results
> --------------------------------------------------------------------------------------------
>
> Key: BEAM-11050
> URL: https://issues.apache.org/jira/browse/BEAM-11050
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Luke Cwik
> Assignee: Luke Cwik
> Priority: P2
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Example failure:
> [https://scans.gradle.com/s/lsf5y44b36pyc/tests/:runners:spark:validatesStructuredStreamingRunnerBatch/org.apache.beam.sdk.transforms.CombineTest$WindowingTests/testSlidingWindowsCombine#1]
> The test passes occassionaly and it depends on the order of merge/reduce steps that Spark does. A good run:
> {noformat}
> LCWIK merge accum1: [] accum2: [TimestampedValueInMultipleWindows{value=[c], timestamp=1970-01-01T00:00:00.003Z, windows=[[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), [1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), [1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}}] rval: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [] accum2: [TimestampedValueInMultipleWindows{value=[b], timestamp=1970-01-01T00:00:00.002Z, windows=[[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), [1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), [1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}}] rval: [TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [] accum2: [TimestampedValueInMultipleWindows{value=[a], timestamp=1970-01-01T00:00:00.001Z, windows=[[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), [1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), [1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}}] rval: [TimestampedValueInSingleWindow{value=[a], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK reduce value: TimestampedValueInMultipleWindows{value=KV{null, b}, timestamp=1970-01-01T00:00:00.002Z, windows=[[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), [1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), [1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}} accum: [] result: [TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK reduce value: TimestampedValueInMultipleWindows{value=KV{null, a}, timestamp=1970-01-01T00:00:00.001Z, windows=[[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), [1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), [1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}} accum: [] result: [TimestampedValueInSingleWindow{value=[a], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK reduce value: TimestampedValueInMultipleWindows{value=KV{null, c}, timestamp=1970-01-01T00:00:00.003Z, windows=[[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), [1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), [1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}} accum: [] result: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [] accum2: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}] rval: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}] accum2: [TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}] rval: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}] accum2: [TimestampedValueInSingleWindow{value=[a], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, b, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}] rval: [TimestampedValueInSingleWindow{value=[a], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, b, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> {noformat}
> Bad run:
> {noformat}
> LCWIK merge accum1: [] accum2: [TimestampedValueInMultipleWindows{value=[c], timestamp=1970-01-01T00:00:00.003Z, windows=[[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), [1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), [1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}}] rval: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [] accum2: [TimestampedValueInMultipleWindows{value=[b], timestamp=1970-01-01T00:00:00.002Z, windows=[[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), [1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), [1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}}] rval: [TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK reduce value: TimestampedValueInMultipleWindows{value=KV{null, c}, timestamp=1970-01-01T00:00:00.003Z, windows=[[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), [1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), [1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}} accum: [] result: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}]
> LCWIK reduce value: TimestampedValueInMultipleWindows{value=KV{null, b}, timestamp=1970-01-01T00:00:00.002Z, windows=[[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), [1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), [1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}} accum: [] result: [TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}] accum2: [TimestampedValueInMultipleWindows{value=[a, c], timestamp=1970-01-01T00:00:00.001Z, windows=[[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), [1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), [1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}}] rval: [TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK reduce value: TimestampedValueInMultipleWindows{value=KV{null, a}, timestamp=1970-01-01T00:00:00.001Z, windows=[[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), [1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), [1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z)], pane=PaneInfo{isFirst=true, timing=EARLY, index=0}} accum: [TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}] result: [TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [] accum2: [TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}] rval: [TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> LCWIK merge accum1: [TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}] accum2: [TimestampedValueInSingleWindow{value=[b, a, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, a, c], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}] rval: [TimestampedValueInSingleWindow{value=[a, c], timestamp=1970-01-01T00:00:00.001Z, window=[1969-12-31T23:59:59.999Z..1970-01-01T00:00:00.002Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[c], timestamp=1970-01-01T00:00:00.005Z, window=[1970-01-01T00:00:00.003Z..1970-01-01T00:00:00.006Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, a, c], timestamp=1970-01-01T00:00:00.003Z, window=[1970-01-01T00:00:00.001Z..1970-01-01T00:00:00.004Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, c], timestamp=1970-01-01T00:00:00.004Z, window=[1970-01-01T00:00:00.002Z..1970-01-01T00:00:00.005Z), pane=PaneInfo.NO_FIRING}, TimestampedValueInSingleWindow{value=[b, a, c], timestamp=1970-01-01T00:00:00.002Z, window=[1970-01-01T00:00:00.000Z..1970-01-01T00:00:00.003Z), pane=PaneInfo.NO_FIRING}]
> {noformat}
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