Re: [Monetdb-developers] Re : COPY, terminating connection

On Sat, Sep 13, 2008 at 12:43:32AM -0700, sylver_b wrote:

Hi Stephan

...

How many (sequential, not concurrent, right?) connections are we talking about, i.e., how many *.CDR files do you have? I wanted to stream about 60 to 100 CDR files

...

How many rows do these *.CDR files hold in total? some files can contain over half a million records - average is 100~200K lines

...

Are all attributes of the cdrwholesaler table string attributes? some of them are date/time, timestamp, int, double, but majority is varchar

How large is your total data volumne? Does it fit into a 32-bit address space? What kind of machine are you running on? CPU, memory, OS? Given that you're using a 32-bit MonetDB installation, I suppose you hardware and OS is 32-bit, too, isn't it?

It looks like for each call of mclient (probably for each cdr line) a connection is opened.

Obviously, you call mclient once for each of you CBR files, and yes, each of these mclient calls make a new connection to the server. For each CBR file (not line!) there should be only one mclient call, and hence, only one connection. Stefan ps: please also note that the vrey fast bulk loading I mentioned only holds for loading from files with the number of rows to be loaded specified in the COPY INTO statement.

SB

----- Message d'origine ---- De : Stefan Manegold À : sylver_b Cc : monetdb-developers@lists.sourceforge.net Envoyé le : Samedi, 13 Septembre 2008, 6h36mn 19s Objet : Re: [Monetdb-developers] COPY, terminating connection

On Fri, Sep 12, 2008 at 04:48:43AM -0700, sylver_b wrote:

...

Hi,

When i run the COPY command from a batch script and after few minutes of processing (2,3minutes), and few thousand lines inserted in the DB, im getting :

Connection terminated

merovingian log is showing:

MSG demo[5084]: # MonetDB server v5.6.0, based on kernel v1.24.0 MSG demo[5084]: # Serving database 'demo' MSG demo[5084]: # Compiled for i686-pc-linux-gnu/32bit with 32bit OIDs dynamically linked MSG demo[5084]: # Copyright (c) 1993-2008 CWI, all rights reserved MSG demo[5084]: # Visit http://monetdb.cwi.nl/ for further information MSG demo[5084]: # Listening for connection requests on mapi:monetdb://ulys:50001/ MSG merovingian[3981]: proxying client 127.0.0.1:41420 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41420 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41422 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41422 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41424 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41424 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41426 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41426 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41428 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41428 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41430 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41430 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41432 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41434 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41432 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41436 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41434 disconnected from proxy MSG merovingian[3981]: client has 127.0.0.1:41436 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41438 for database 'demo' to mapi:monetdb://ulys:50001/ MSG merovingian[3981]: client has 127.0.0.1:41438 disconnected from proxy MSG merovingian[3981]: database 'demo' already running since 2008-09-12 11:44:44, up min/avg/max: 30/37441/213742, crash average: 0.00 0.10 0.03 (8-6=1) MSG merovingian[3981]: proxying client 127.0.0.1:41440 for database 'demo' to mapi:monetdb://ulys:50001/ TME 2008-09-12 11:56:46 MSG merovingian[3981]: client has 127.0.0.1:41440 disconnected from proxy

This is what my script does :

#!/bin/sh

FILE=$1 awk -F "\"*;\"*" '{print ";",$1,";",$2,";",$3,";",$4,";",$5,";",$6,";",$8,";",$9,";",$10,";",$13,";",$15,";",$18,";",$22,";",$24,";",$25,";",$26,";",$27,";",$28,";",$29,";",$30,";",$31,";",$32,";",$33,";",$35,";",$36,";",$38,";",$39,";",$42,";",$47,";",$48,";",$49,";",$53,";",$54,";",$55,";","FILE"}' $1 | sed -e "s/ ; /;/g; s/; /;/g" | mclient -lsql -d demo -i -s "COPY INTO cdrwholesaler FROM STDIN USING DELIMITERS ';' NULL AS ''"

and this is how i call it :

find /usr/ftp -name '*.CDR' -exec /var/www/consolecdr/batch/test_monetdb/awk_csv_generator.sh {} \;

Is there anything im doing wrong ? I have the feeling there must be too many connections crashing the system .. coz after that i can't use mclient anymore, i have to restart the DB.

How many (sequential, not concurrent, right?) connections are we talking about, i.e., how many *.CDR files do you have?

How many rows do these *.CDR files hold in total?

Are all attributes of the cdrwholesaler table string attributes?

... "too many connections" *might* be the problem (though it should of course not) --- strange, though, that the merovingian log do not give any indication of whether, and if so why the server might have crashed ...

Stefan

...

Please advise, Thanks SB

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------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Monetdb-developers mailing list Monetdb-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/monetdb-developers

-- | Dr. Stefan Manegold | mailto:Stefan.Manegold@cwi.nl | | CWI, P.O.Box 94079 | http://www.cwi.nl/~manegold/ | | 1090 GB Amsterdam | Tel.: +31 (20) 592-4212 | | The Netherlands | Fax : +31 (20) 592-4312 |