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From "huaicui (Jira)" <j...@apache.org>
Subject [jira] [Resolved] (FLUME-3358) The kafka channel does not work properly when the interceptor filters into an empty event queue
Date Wed, 04 Mar 2020 12:43:00 GMT

     [ https://issues.apache.org/jira/browse/FLUME-3358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

huaicui resolved FLUME-3358.
----------------------------
    Resolution: Not A Bug

> The kafka channel does not work properly when the interceptor filters into an empty event
queue 
> ------------------------------------------------------------------------------------------------
>
>                 Key: FLUME-3358
>                 URL: https://issues.apache.org/jira/browse/FLUME-3358
>             Project: Flume
>          Issue Type: Bug
>          Components: Kafka Channel
>    Affects Versions: 1.9.0
>            Reporter: huaicui
>            Priority: Trivial
>         Attachments: exception.jpg
>
>
> I have a requirement to stream and filter kafka topics according to the business. Because
the filter will cause list<Event> to be empty, the whole pipeline will not work properly
> logic like this:
> String key = JsonPath.read(message, "$.key");
>  switch (key)
> { case "test1": return process(key, event); case "test2": return process(key, event);
case "test3": return process(key, event); default: return null; }
> When all data of a queue will be filtered,  this pipeline(kafka->hdfs) will stay
in an abnormal state.
>  
> This is my configuration:
>  # device flume
>  Test.sources = r1
>  Test.sinks = k1
>  Test.channels = c1
> Test.sources.r1.type = org.apache.flume.source.kafka.KafkaSource
>  Test.sources.r1.kafka.bootstrap.servers = xxxx
>  Test.sources.r1.topic = xxx
>  Test.sources.r1.groupId = test_lab_1
>  Test.sources.r1.kafka.consumer.timeout.ms = 100
>  Test.sources.r1.interceptors = i1
>  Test.sources.r1.interceptors.i1.type = com.goe.DeviceUsageDeserializerInterceptor$Builder.
— This is my custom interceptor
>  # Describe the sink
>  Test.sinks.k1.type = hdfs
>  Test.sinks.k1.hdfs.path = /user/naming/%\{DeviceDir}
>  Test.sinks.k1.hdfs.filePrefix = device-
>  Test.sinks.k1.hdfs.fileSuffix = .csv
>  Test.sinks.k1.hdfs.inUseSuffix = .tmp
>  Test.sinks.k1.hdfs.idleTimeout = 120
>  Test.sinks.k1.hdfs.writeFormat = Text
>  Test.sinks.k1.hdfs.batchSize = 100
>  Test.sinks.k1.hdfs.threadsPoolSize = 10
>  Test.sinks.k1.hdfs.rollSize = 0
>  Test.sinks.k1.hdfs.rollCount = 0
>  # Use a channel which buffers events in memory
>  Test.channels.c1.type = memory
>  Test.channels.c1.capacity = 10000
>  Test.channels.c1.transactionCapacity = 1000
>  # Bind the source and sink to the channel
>  Test.sources.r1.channels = c1
>  Test.sinks.k1.channel = c1
> this is exception:
> !image-2020-03-04-19-13-16-068.png!



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