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Flume, mail # user - Avro sink to source is too slow


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Re: Avro sink to source is too slow
Roshan Naik 2013-09-30, 22:50
Anat,
   Can you give details on the second flume agent ?  for measuring, I
suggest you
- switch to mem channel  on both agents
- make your taget destination a separate disk (or diff host with fast n/w
connection)

it seems like there maybe too many components contending on the same disk
(spool source, file channels and sink on 2nd agent)

-roshan

On Mon, Sep 30, 2013 at 1:02 PM, Mike Keane <[EMAIL PROTECTED]> wrote:

> As far as a fast disk if you only have one the drive head will be seeking
> constantly and performance will be awful we were having problems at 10,000
> log lines per second.  I've pushed over 270,000 lines per second compressed.
>
> I don't think it is avro, I'm able to saturate a gigabit line easily, so
> ~100mb / second of compressed data.
>
> I don't see a sink group in your configuration, I'm curious as to what the
> default behavior is when you tie multiple sinks to a file channel without a
> sink group.  That said I found performance issues using a single file
> channel with compression.  To get maximum performance I put a header on my
> events called "channel" since our servers are all numbered I was able to
> take (server# mod 6)+1 and make that the value for the "channel" header
> thus getting fairly even distribution of log data.  On my source I send
> data by channel header to the appropriate channel.  This parallelized the
> compression down 6 file channels.  I then have 3 sinks per channel using a
> failover sink group.   Also, do you need compression level 9?  I've found
> the gains in higher compression level are negligable compared to the
> performance expense (not with flume/deflate specifically but in general).
>  I found with turning compression level to 1 caused my sink to run 6-7
> times slower, my solution was to parallelize the compression and by trial
> and error found this to be the best case.
>
> agentName.sources.collector_source.selector.type = multiplexing
> agentName.sources.collector_source.selector.header = channel
> agentName.sources.collector_source.selector.mapping.1 = channel_1
> agentName.sources.collector_source.selector.mapping.2 = channel_2
> agentName.sources.collector_source.selector.mapping.3 = channel_3
> agentName.sources.collector_source.selector.mapping.4 = channel_4
> agentName.sources.collector_source.selector.mapping.5 = channel_5
> agentName.sources.collector_source.selector.default = channel_6
>
>
> -Mike
>
>
>
> On 09/30/2013 02:30 PM, Anat Rozenzon wrote:
> AFAIK we have a fast disk
> However I think  the problem is with avro and not the channel as you can
> see in the metrics below the channel got filled quickly but draining very
> slowly.
> After a few minutes of running only 70-80 batches were sent by each sink.
> {
>
> "SINK.AvroSink1-4":{"BatchCompleteCount":"74","ConnectionFailedCount":"0","EventDrainAttemptCount":"74000","ConnectionCreatedCount":"3","Type":"SINK","BatchEmptyCount":"1","ConnectionClosedCount":"2","EventDrainSuccessCount":"71000","StopTime":"0","StartTime":"1380568140738","BatchUnderflowCount":"0"},
>
> "SOURCE.logsdir":{"OpenConnectionCount":"0","Type":"SOURCE","AppendBatchAcceptedCount":"1330","AppendBatchReceivedCount":"1330","EventAcceptedCount":"1326298","AppendReceivedCount":"0","StopTime":"0","StartTime":"1380568140830","EventReceivedCount":"1326298","AppendAcceptedCount":"0"},
>
> "CHANNEL.fileChannel":{"EventPutSuccessCount":"1326298","ChannelFillPercentage":"51.314899999999994","Type":"CHANNEL","StopTime":"0","EventPutAttemptCount":"1326298","ChannelSize":"1026298","StartTime":"1380568140730","EventTakeSuccessCount":"300000","ChannelCapacity":"2000000","EventTakeAttemptCount":"310073"},
>
> "SINK.AvroSink1-2":{"BatchCompleteCount":"78","ConnectionFailedCount":"0","EventDrainAttemptCount":"78000","ConnectionCreatedCount":"3","Type":"SINK","BatchEmptyCount":"1","ConnectionClosedCount":"2","EventDrainSuccessCount":"75000","StopTime":"0","StartTime":"1380568140736","BatchUnderflowCount":"0"},
>
> "SINK.AvroSink1-3":{"BatchCompleteCount":"81","ConnectionFailedCount":"0","EventDrainAttemptCount":"81000","ConnectionCreatedCount":"3","Type":"SINK","BatchEmptyCount":"1","ConnectionClosedCount":"2","EventDrainSuccessCount":"79000","StopTime":"0","StartTime":"1380568140736","BatchUnderflowCount":"0"},

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