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Posted to issues@spark.apache.org by "Zhongwei Zhu (Jira)" <ji...@apache.org> on 2020/06/22 17:41:00 UTC
[jira] [Updated] (SPARK-32044) [SS] 2.4 Kakfa continuous processing
print mislead initial offsets log
[ https://issues.apache.org/jira/browse/SPARK-32044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zhongwei Zhu updated SPARK-32044:
---------------------------------
Summary: [SS] 2.4 Kakfa continuous processing print mislead initial offsets log (was: [SS] Kakfa continuous processing print mislead initial offsets log )
> [SS] 2.4 Kakfa continuous processing print mislead initial offsets log
> -----------------------------------------------------------------------
>
> Key: SPARK-32044
> URL: https://issues.apache.org/jira/browse/SPARK-32044
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.4.6
> Reporter: Zhongwei Zhu
> Priority: Trivial
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> When using structured streaming in continuous processing mode, after restart spark job, spark job can correctly pick up offsets in checkpoint location from last epoch. But it always print out below log:
> 20/06/12 00:58:09 INFO [stream execution thread for [id = 34e5b909-f9fe-422a-89c0-081251a68693, runId = 0246e19d-aaa1-4a5c-9091-bab1a0578a0a]] kafka010.KafkaContinuousReader: Initial offsets: \{"kafka_topic":{"8":51618236,"11":51610655,"2":51622889,"5":51637171,"14":51637346,"13":51627784,"4":51606960,"7":51632475,"1":51636129,"10":51632212,"9":51634107,"3":51611013,"12":51626567,"15":51640774,"6":51637823,"0":51629106}}
> This log is misleading as spark didn't use this one as initial offsets. Also, it results in unnecessary kafka offset fetch. This is caused by below code in KafkaContinuousReader
> {code:java}
> offset = start.orElse {
> val offsets = initialOffsets match {
> case EarliestOffsetRangeLimit =>
> KafkaSourceOffset(offsetReader.fetchEarliestOffsets())
> case LatestOffsetRangeLimit =>
> KafkaSourceOffset(offsetReader.fetchLatestOffsets(None))
> case SpecificOffsetRangeLimit(p) =>
> offsetReader.fetchSpecificOffsets(p, reportDataLoss)
> }
> logInfo(s"Initial offsets: $offsets")
> offsets
> }
> {code}
> The code inside orElse block is always executed even when start has value.
>
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