Is there a concept of a data file which is 'done'? Does Flume remove data files it no longer needs, or will these build up?
Regards, Guy Needham | Data Discovery Virgin Media | Enterprise Data, Design & Management 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:[email protected]] Sent: 10 November 2014 09:15 To: [email protected] Cc: [email protected] Subject: RE: File channels creating many large files That value is in bytes. At 500k, you will likely end up with too many files. You should set it as high as you can. Thanks, Hari On Mon, Nov 10, 2014 at 1:05 AM, Needham, Guy <[email protected]<mailto:[email protected]>> wrote: Hari, Jeff, thanks for your replies. It's Flume 1.5.0, I'll use the maxFileSize parameter to fix this. Is there any impact on channel optimisation from setting it to say 500000? Regards, Guy Needham | Data Discovery Virgin Media | Enterprise Data, Design & Management 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:[email protected]] Sent: 07 November 2014 17:59 To: [email protected] Cc: [email protected] Subject: Re: File channels creating many large files Flume will leave at least 2 files per data directory. Once you have enough events to cause 2 files to be created, there will be at least 2 per dir. You can use maxFileSize parameter to control the size of these files. Thanks, Hari On Fri, Nov 7, 2014 at 10:25 AM, Jeff Lord <[email protected]<mailto:[email protected]>> wrote: Guy, What version of flume is this? -Jeff On Fri, Nov 7, 2014 at 1:19 AM, Needham, Guy <[email protected]<mailto:[email protected]>> wrote: Hi all, I have a configuration with a file channel configured such that: a1.channels.ch1.type = file a1.channels.ch1.checkpointDir = /hadoop/user/flume/channels/checkpoint a1.channels.ch1.dataDirs = /hadoop/user/flume/channels/data a1.channels.ch1.capacity = 100000 a1.channels.ch1.transactionCapacity = 5000 It's been running since October 28th with no issues, but when I looked today in /hadoop/user/flume/channels/data I saw that the file channel was building up large files which had been processed and not deleting them: [rdd@hadoop-kn-p2-m01 flume]$ ls -lh channels/data/ total 1.6G -rw-r----- 1 rdd rdd 1.5G Oct 28 16:10 log-1 -rw-r----- 1 rdd rdd 47 Oct 28 16:10 log-1.meta -rw-r----- 1 rdd rdd 72M Oct 31 16:28 log-2 -rw-r----- 1 rdd rdd 47 Oct 31 16:29 log-2.meta It seems like for each day that data landed (we're still in testing so data not landing constantly) a data file has been created but not deleted when reading was completed. Is this expected behaviour? Is there a way to stop large files building up and still use the file channel? Regards, Guy Needham | Data Discovery Virgin Media | Enterprise Data, Design & Management Bartley Wood Business Park, Hook, Hampshire RG27 9UP D 01256 75 3362 I welcome VSRE emails. Learn more at http://vsre.info/ -------------------------------------------------------------------- Save Paper - Do you really need to print this e-mail? Visit www.virginmedia.com<http://www.virginmedia.com> for more information, and more fun. This email and any attachments are or may be confidential and legally privileged and are sent solely for the attention of the addressee(s). If you have received this 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 those of Virgin Media. Any representations or commitments in this email are subject to contract. 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