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https://issues.apache.org/jira/browse/BEAM-7978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915521#comment-16915521
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Mateusz commented on BEAM-7978:
-------------------------------
[~aromanenko], you might be right that currently only Dataflow runner is
affected (I've searched in repository and getTotalBacklogBytes() is executed
only from dataflow runner's code).
As mentioned in the ticket's description, I've tested it locally and with
Dataflow runner - execution with direct runner looks fine.
If the watermark is initialised with BoundedWindow.TIMESTAMP_MIN_VALUE then the
getTotalBacklogBytes() should be prepared for such scenario. I wonder if in
case of uninitialised watermark, UnboundedReader.BACKLOG_UNKNOWN should be
returned to indicate decision shouldn't be made based on the data? Because, if
initial value of watermark/event time would be changed to previous value
(Instant().minus(MAX_KINESIS_STREAM_RETENTION_PERIOD)) then the method won't
throw exception on execution, but would provide false information about
remaining bytes to process.
> ArithmeticExceptions on getting backlog bytes
> ----------------------------------------------
>
> Key: BEAM-7978
> URL: https://issues.apache.org/jira/browse/BEAM-7978
> Project: Beam
> Issue Type: Bug
> Components: io-java-kinesis
> Affects Versions: 2.14.0
> Reporter: Mateusz
> Assignee: Alexey Romanenko
> Priority: Major
>
> Hello,
> Beam 2.14.0
> (and to be more precise
> [commit|https://github.com/apache/beam/commit/9fe0a0387ad1f894ef02acf32edbc9623a3b13ad#diff-b4964a457006b1555c7042c739b405ec])
> introduced a change in watermark calculation in Kinesis IO causing below
> error:
> {code:java}
> exception: "java.lang.RuntimeException: Unknown kinesis failure, when trying
> to reach kinesis
> at
> org.apache.beam.sdk.io.kinesis.SimplifiedKinesisClient.wrapExceptions(SimplifiedKinesisClient.java:227)
> at
> org.apache.beam.sdk.io.kinesis.SimplifiedKinesisClient.getBacklogBytes(SimplifiedKinesisClient.java:167)
> at
> org.apache.beam.sdk.io.kinesis.SimplifiedKinesisClient.getBacklogBytes(SimplifiedKinesisClient.java:155)
> at
> org.apache.beam.sdk.io.kinesis.KinesisReader.getTotalBacklogBytes(KinesisReader.java:158)
> at
> org.apache.beam.runners.dataflow.worker.StreamingModeExecutionContext.flushState(StreamingModeExecutionContext.java:433)
> at
> org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.process(StreamingDataflowWorker.java:1289)
> at
> org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker.access$1000(StreamingDataflowWorker.java:149)
> at
> org.apache.beam.runners.dataflow.worker.StreamingDataflowWorker$6.run(StreamingDataflowWorker.java:1024)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ArithmeticException: Value cannot fit in an int:
> 153748963401
> at org.joda.time.field.FieldUtils.safeToInt(FieldUtils.java:229)
> at
> org.joda.time.field.BaseDurationField.getDifference(BaseDurationField.java:141)
> at
> org.joda.time.base.BaseSingleFieldPeriod.between(BaseSingleFieldPeriod.java:72)
> at org.joda.time.Minutes.minutesBetween(Minutes.java:101)
> at
> org.apache.beam.sdk.io.kinesis.SimplifiedKinesisClient.lambda$getBacklogBytes$3(SimplifiedKinesisClient.java:169)
> at
> org.apache.beam.sdk.io.kinesis.SimplifiedKinesisClient.wrapExceptions(SimplifiedKinesisClient.java:210)
> ... 10 more
> {code}
> We spotted this issue on Dataflow runner. It's problematic as inability to
> get backlog bytes seems to result in constant recreation of KinesisReader.
> The issue happens if the backlog bytes are retrieved before watermark value
> is updated from initial default value. Easy way to reproduce it is to create
> a pipeline with Kinesis source for a stream where no records are being put.
> While debugging it locally, you can observe that the watermark is set to the
> value on the past (like: "-290308-12-21T19:59:05.225Z"). After two minutes
> (default watermark idle duration threshold is set to 2 minutes) , the
> watermark is set to value of
> [watermarkIdleThreshold|https://github.com/apache/beam/blob/9fe0a0387ad1f894ef02acf32edbc9623a3b13ad/sdks/java/io/kinesis/src/main/java/org/apache/beam/sdk/io/kinesis/WatermarkPolicyFactory.java#L110]),
> so the next backlog bytes retrieval should be correct. However, as described
> before, running the pipeline on Dataflow runner results in KinesisReader
> being closed just after creation, so the watermark won't be fixed.
> The reason of the issue is following: The introduced watermark policies are
> relying on
> [WatermarkParameters|https://github.com/apache/beam/blob/9fe0a0387ad1f894ef02acf32edbc9623a3b13ad/sdks/java/io/kinesis/src/main/java/org/apache/beam/sdk/io/kinesis/WatermarkParameters.java]
> which initialises currentWatermark and eventTime to
> [BoundedWindow.TIMESTAMP_MIN_VALUE|https://github.com/apache/beam/commit/9fe0a0387ad1f894ef02acf32edbc9623a3b13ad#diff-b4964a457006b1555c7042c739b405ecR52].
> This result in watermark being set to new Instant(-9223372036854775L) at the
> KinesisReader creation. Calculated [period between the watermark and the
> current
> timestamp|https://github.com/apache/beam/blob/9fe0a0387ad1f894ef02acf32edbc9623a3b13ad/sdks/java/io/kinesis/src/main/java/org/apache/beam/sdk/io/kinesis/SimplifiedKinesisClient.java#L169]
> is bigger than expected causing the ArithmeticException to be thrown.
> The maximum retention on Kinesis streams is [7
> days|https://aws.amazon.com/kinesis/data-streams/faqs/] so it should be safe
> to initialise the affected watermark parameters with new
> Instant().minus(MAX_KINESIS_STREAM_RETENTION_PERIOD) where
> MAX_KINESIS_STREAM_RETENTION_PERIOD is the duration of 7 days.
> Remark: seems that in the past there was similar issue present (fixed in
> 2.4). Please look into the
> [ticket|https://issues.apache.org/jira/browse/BEAM-3881].
> Best regards,
> Mateusz
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