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From Hari Shreedharan <hshreedha...@cloudera.com>
Subject Re: Recommendation of parameters for better performance with File Channel
Date Wed, 12 Dec 2012 21:44:58 GMT
Yep, each sink with a different prefix will work fine too. My suggestion was just meant to
avoid collision - file prefixes are good enough for that. 

-- 
Hari Shreedharan


On Wednesday, December 12, 2012 at 1:13 PM, Bhaskar V. Karambelkar wrote:

> Hari,
> If each sink uses a different file prefix, what's the need to write to
> multiple HDFS directories.
> All our sinks write to the same HDFS directory and each uses a unique
> file prefix, and it seems to work fine.
> Also haven't found anything in flume code or HDFS APIs which suggest
> that two sinks can't write to the same directory.
> 
> Just curious.
> thanks
> 
> 
> On Wed, Dec 12, 2012 at 12:53 PM, Hari Shreedharan
> <hshreedharan@cloudera.com (mailto:hshreedharan@cloudera.com)> wrote:
> > Also note that having multiple sinks often improves performance - though you
> > should have each sink write to a different directory on HDFS. Since each
> > sink really uses only on thread at a time to write, having multiple sinks
> > allows multiple threads to write to HDFS. Also if you can spare additional
> > disks on your Flume agent machine for file channel data directories, that
> > will also improve performance.
> > 
> > 
> > 
> > Hari
> > 
> > --
> > Hari Shreedharan
> > 
> > On Wednesday, December 12, 2012 at 7:36 AM, Brock Noland wrote:
> > 
> > Hi,
> > 
> > Why not try increasing the batch size on the source and sink to 10,000?
> > 
> > Brock
> > 
> > On Wed, Dec 12, 2012 at 4:08 AM, Jagadish Bihani
> > <jagadish.bihani@pubmatic.com (mailto:jagadish.bihani@pubmatic.com)> wrote:
> > 
> > 
> > I am using latest release of flume. (Flume 1.3.0) and hadoop 1.0.3.
> > 
> > 
> > On 12/12/2012 03:35 PM, Jagadish Bihani wrote:
> > 
> > 
> > Hi
> > 
> > I am able to write maximum 1.5 MB/sec data to HDFS (without compression)
> > using File Channel. Are there any recommendations to improve the
> > performance?
> > Has anybody achieved around 10 MB/sec with file channel ? If yes please
> > share the
> > configuration like (Hardware used, RAM allocated and batch sizes of
> > source,sink and channels).
> > 
> > Following are the configuration details :
> > ========================
> > 
> > I am using a machine with reasonable hardware configuration:
> > Quadcore 2.00 GHz processors and 4 GB RAM.
> > 
> > Command line options passed to flume agent :
> > -DJAVA_OPTS="-Xms1g -Xmx4g -Dcom.sun.management.jmxremote
> > -XX:MaxDirectMemorySize=2g"
> > 
> > Agent Configuration:
> > =============
> > agent.sources = avro-collection-source spooler
> > agent.channels = fileChannel
> > agent.sinks = hdfsSink fileSink
> > 
> > # For each one of the sources, the type is defined
> > 
> > agent.sources.spooler.type = spooldir
> > agent.sources.spooler.spoolDir =/root/test_data
> > agent.sources.spooler.batchSize = 1000
> > agent.sources.spooler.channels = fileChannel
> > 
> > # Each sink's type must be defined
> > agent.sinks.hdfsSink.type = hdfs
> > agent.sinks.hdfsSink.hdfs.path=hdfs://mltest2001/flume/release3Test
> > 
> > agent.sinks.hdfsSink.hdfs.fileType =DataStream
> > agent.sinks.hdfsSink.hdfs.rollSize=0
> > agent.sinks.hdfsSink.hdfs.rollCount=0
> > agent.sinks.hdfsSink.hdfs.batchSize=1000
> > agent.sinks.hdfsSink.hdfs.rollInterval=60
> > 
> > agent.sinks.hdfsSink.channel= fileChannel
> > 
> > agent.channels.fileChannel.type=file
> > agent.channels.fileChannel.dataDirs=/root/flume_channel/dataDir13
> > 
> > agent.channels.fileChannel.checkpointDir=/root/flume_channel/checkpointDir13
> > 
> > Regards,
> > Jagadish
> > 
> > 
> > 
> > 
> > --
> > Apache MRUnit - Unit testing MapReduce - http://incubator.apache.org/mrunit/
> > 
> 
> 
> 



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