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  1. Beam
  2. BEAM-11050

AggregatorCombiner reuses mutable accumT across multiple merges leading to incorrect results

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Details

    • Bug
    • Status: Resolved
    • P2
    • Resolution: Fixed
    • None
    • 2.26.0
    • runner-spark
    • None

    Description

      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:

      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}]

      Bad run:

      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}]

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              lcwik Luke Cwik
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