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From "Needham, Guy" <Guy.Need...@virginmedia.co.uk>
Subject RE: Many files in file channel data directory
Date Wed, 14 Jan 2015 09:38:42 GMT
Thanks Hari, I made that change, will see what happens.


Regards,

Guy Needham | Data Discovery
Virgin Media   | Technology and Transformation | Data
Bartley Wood Business Park, Hook, Hampshire RG27 9UP
D 01256 75 3362
I welcome VSRE emails. Learn more at http://vsre.info/



________________________________
From: Hari Shreedharan [mailto:hshreedharan@cloudera.com]
Sent: 13 January 2015 18:06
To: user@flume.apache.org
Cc: user@flume.apache.org
Subject: Re: Many files in file channel data directory

This issue is that your max file size is really small.

This parameter:

flume_test.channels.ch1.maxFileSize = 10000000

sets the size of each file in bytes, so you want it to be much bigger. Why not simply leave
it at default which will keep at around 1.6G? These are not your HDFS files' sizes, these
are the file sizes for internal file sizes of the file channel.

Thanks,
Hari



On Tue, Jan 13, 2015 at 7:32 AM, Needham, Guy <Guy.Needham@virginmedia.co.uk<mailto:Guy.Needham@virginmedia.co.uk>>
wrote:

I'm running Flume 1.5.0 with this configuration:

flume_test.sources = sr1
flume_test.channels = ch1
flume_test.sinks = sk1

#avro source
flume_test.sources.sr1.type = avro
flume_test.sources.sr1.channels = ch1
flume_test.sources.sr1.bind = 10.92.211.22
flume_test.sources.sr1.port = 55000
flume_test.sources.sr1.ssl = true
flume_test.sources.sr1.keystore = /nas/used_by_hadoop/hadoop-kn-p2/rdd/hadoop_keystore.jks
flume_test.sources.sr1.keystore-password = *****
flume_test.sources.sr1.compression-type = gzip

#custom interceptor
flume_test.sources.sr1.interceptors = i1
flume_test.sources.sr1.interceptors.i1.type = com.vm.rdd.TimeBodyInterceptor$Builder

#memory channel
flume_test.channels.ch1.type = file
flume_test.channels.ch1.checkpointDir = /hadoop/user/flume/channels/flumeTest/checkpoint
flume_test.channels.ch1.dataDirs = /hadoop/user/flume/channels/flumeTest/data
flume_test.channels.ch1.capacity = 100000000
flume_test.channels.ch1.transactionCapacity = 10000
flume_test.channels.ch1.maxFileSize = 10000000

#HDFS channel
flume_test.sinks.sk1.channel = ch1
flume_test.sinks.sk1.type = hdfs
#dynamic path
flume_test.sinks.sk1.hdfs.path = hdfs:///landing/data/flumeTest/%Y-%m-%d
flume_test.sinks.sk1.hdfs.inUsePrefix = _
flume_test.sinks.sk1.hdfs.codeC = gzip
#write at this block size when reach it
flume_test.sinks.sk1.hdfs.rollSize = 2560000000
# roll file every 2 minutes if not filled a block
flume_test.sinks.sk1.hdfs.rollInterval = 120
# if file has been idle for 15s, close file
flume_test.sinks.sk1.hdfs.idleTimeout = 15
flume_test.sinks.sk1.hdfs.rollCount = 0
flume_test.sinks.sk1.hdfs.batchSize = 100

When I look at the data dir, there are many files:

-rw-r--r-- 1 rdd rdd    0 Jan 13 12:06 in_use.lock
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-1
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-2
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-3
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-4
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-5
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-6
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-7
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-8
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-9
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-10
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-11
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-12
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-13.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-1.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-2.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-3.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-4.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-5.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-6.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-7.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-8.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-9.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-10.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-11.meta
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-12.meta
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-13
-rw-r--r-- 1 rdd rdd 1.0M Jan 13 12:09 log-14
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:09 log-14.meta
-rw-r--r-- 1 rdd rdd    0 Jan 13 12:15 log-15
-rw-r--r-- 1 rdd rdd   47 Jan 13 12:15 log-15.meta

This list can grow up to hundreds of log files which are all accessed around the same time.
When looking in the log file, it appears that the channels are duplicates of one another,
as the agent is writing to each channel at the same time, for example:

2015-01-13 12:09:52,451 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.Log.writeCheckpoint(Log.java:1005)]
Updated checkpoint for file: /hadoop/user/flume/channels/flumeTest/data/log-14 position: 120431
logWriteOrderID: 1421150977639
2015-01-13 12:09:52,451 (Log-BackgroundWorker-ch1) [DEBUG - org.apache.flume.channel.file.Log.removeOldLogs(Log.java:1067)]
Files currently in use: [14]
2015-01-13 12:09:52,451 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-1
2015-01-13 12:09:52,456 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-2
2015-01-13 12:09:52,461 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-3
2015-01-13 12:09:52,467 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-4
2015-01-13 12:09:52,472 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-5
2015-01-13 12:09:52,477 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-6
2015-01-13 12:09:52,482 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-7
2015-01-13 12:09:52,487 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-8
2015-01-13 12:09:52,492 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-9
2015-01-13 12:09:52,497 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-10
2015-01-13 12:09:52,503 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-11
2015-01-13 12:09:52,508 (Log-BackgroundWorker-ch1) [INFO - org.apache.flume.channel.file.LogFile$RandomReader.close(LogFile.java:504)]
Closing RandomReader /hadoop/user/flume/channels/flumeTest/data/log-12
Does anyone know why there are so many active files at one time? Is this expected behaviour?

Regards,

Guy Needham | Data Discovery
Virgin Media   | Technology and Transformation | Data
Bartley Wood Business Park, Hook, Hampshire RG27 9UP
D 01256 75 3362
I welcome VSRE emails. Learn more at http://vsre.info/



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email in error, please delete it from your system: its use, disclosure or copying is
unauthorised. Statements and opinions expressed in this email may not represent
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subject to contract. 

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Registered in England and Wales with number 2591237

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