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From "Hitesh Shah (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TEZ-2544) Incorrect dag result due to wrong TaskSpec in recovering
Date Tue, 28 Jul 2015 17:57:04 GMT

     [ https://issues.apache.org/jira/browse/TEZ-2544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hitesh Shah updated TEZ-2544:
-----------------------------
    Priority: Critical  (was: Blocker)

> Incorrect dag result due to wrong TaskSpec in recovering
> --------------------------------------------------------
>
>                 Key: TEZ-2544
>                 URL: https://issues.apache.org/jira/browse/TEZ-2544
>             Project: Apache Tez
>          Issue Type: Sub-task
>            Reporter: Jeff Zhang
>            Assignee: Jeff Zhang
>            Priority: Critical
>              Labels: Recovery
>
> Expected TaskSpec
> {noformat}
> DAGName : OrderedWordCount, VertexName: Summation, VertexParallelism: 1, TaskAttemptID:attempt_1433850314856_0019_1_01_000000_0,
processorName=org.apache.tez.examples.OrderedWordCount$SumProcessor, inputSpecListSize=1,

> outputSpecListSize=1, inputSpecList=[{{ sourceVertexName=Tokenizer, physicalEdgeCount=2,
inputClassName=org.apache.tez.runtime.library.input.OrderedGroupedKVInput }}, ], outputSpecList=[{{
destinationVertexName=Sorter, physicalEdgeCount=1, outputClassName=org.apache.tez.runtime.library.output.OrderedPartitionedKVOutput
}}
> {noformat}
> The actual TaskSpec
> {noformat}
> DAGName : OrderedWordCount, VertexName: Summation, VertexParallelism: 1, TaskAttemptID:attempt_1433850314856_0019_1_01_000000_0,
processorName=org.apache.tez.examples.OrderedWordCount$SumProcessor, inputSpecListSize=1,

> outputSpecListSize=1, inputSpecList=[{{ sourceVertexName=Tokenizer, physicalEdgeCount=1,
inputClassName=org.apache.tez.runtime.library.input.OrderedGroupedKVInput }}, ], outputSpecList=[{{
destinationVertexName=Sorter, physicalEdgeCount=1, outputClassName=org.apache.tez.runtime.library.output.OrderedPartitionedKVOutput
}}
> {noformat}
> The expected physicalEdgeCount is 2 but actually it is 1, it happens when dynamic parallelism
estimation is enabled. 
> The cause is that Task is recovering but its vertex's source edge manager has not been
updated from ScatterGatherEdgeManager to CustomShuffleEdgeManager, so will result in different
physicalEdgeCount for InputSpec



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