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https://issues.apache.org/jira/browse/FLUME-3106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044177#comment-16044177
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Yongxi Zhang commented on FLUME-3106:
-------------------------------------
I think when takeList is full, memoryChannel should return null,not throw a
exception.
> When batchSize of sink greater than transactionCapacity of Memory Channel,
> Flume can produce endless data
> ---------------------------------------------------------------------------------------------------------
>
> Key: FLUME-3106
> URL: https://issues.apache.org/jira/browse/FLUME-3106
> Project: Flume
> Issue Type: Bug
> Components: Channel
> Affects Versions: 1.7.0
> Reporter: Yongxi Zhang
> Fix For: 1.8.0
>
> Attachments: FLUME-3106-0.patch
>
>
> Flume can produce endless data when use this following config:
> {code:xml}
> agent.sources = src1
> agent.sinks = sink1
> agent.channels = ch2
> agent.sources.src1.type = spooldir
> agent.sources.src1.channels = ch2
> agent.sources.src1.spoolDir = /home/kafka/flumeSpooldir
> agent.sources.src1.fileHeader = false
> agent.sources.src1.batchSize = 5
> agent.channels.ch2.type=memory
> agent.channels.ch2.capacity=100
> agent.channels.ch2.transactionCapacity=5
> agent.sinks.sink1.type = hdfs
> agent.sinks.sink1.channel = ch2
> agent.sinks.sink1.hdfs.path = hdfs://kafka1:9000/flume/
> agent.sinks.sink1.hdfs.rollInterval=1
> agent.sinks.sink1.hdfs.fileType = DataStream
> agent.sinks.sink1.hdfs.writeFormat = Text
> agent.sinks.sink1.hdfs.batchSize = 10
> {code}
> And there are Exceptions like this:
> {code:xml}
> org.apache.flume.ChannelException: Take list for MemoryTransaction, capacity
> 5 full, consider committing more frequently, increasing capaci
> ty, or increasing thread count
> at
> org.apache.flume.channel.MemoryChannel$MemoryTransaction.doTake(MemoryChannel.java:99)
> at
> org.apache.flume.channel.BasicTransactionSemantics.take(BasicTransactionSemantics.java:113)
> at
> org.apache.flume.channel.BasicChannelSemantics.take(BasicChannelSemantics.java:95)
> at
> org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:362)
> at
> org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67)
> at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145)
> at java.lang.Thread.run(Thread.java:745)
> 17/06/09 09:48:04 ERROR flume.SinkRunner: Unable to deliver event. Exception
> follows.
> org.apache.flume.EventDeliveryException: org.apache.flume.ChannelException:
> Take list for MemoryTransaction, capacity 5 full, consider comm
> itting more frequently, increasing capacity, or increasing thread count
> at
> org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:451)
> at
> org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67)
> at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> When takeList of Memory Channel is full，there is a ChannelException will be
> throwed,The event of takeList has been writed by the sink and roll back to
> the queue of memoryChannel at the same time，it is not reasonable.
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