Hi,

I need your help to find a fast algorithm to process log files, finding the pairs and then generate a new logfile joining the pairs information in a single entry.

I have to process log files that are generated per minute, so my processing time should be below a minute.

An example of the logfiles:

FILE_MINUTE_0.log 
20090619
   ID = 0
   TIMESTAMP = 1244127600
   COUNT_2 = 10

[download]
FILE_MINUTE_1.log 
20090619
   ID = 0
   TIMESTAMP = 1244127600
   COUNT_1 = 10
20090619
   ID = 1
   TIMESTAMP = 1244127600
   COUNT_1 = 10
20090619
   ID = 1
   TIMESTAMP = 1244127600
   COUNT_2 = 10
20090619
   ID = 2
   TIMESTAMP = 1244127600
   COUNT_1 = 10
20090619
   ID = 3
   TIMESTAMP = 1244127600
   COUNT_2 = 10

20090619
   ID = 4
   TIMESTAMP = 1244127600
   COUNT_1 = 10

[download]
FILE_MINUTE_2.log 
20090619
   ID = 4
   TIMESTAMP = 1244127600
   COUNT_2 = 10

[download]

I've to process the above files and generate a new one joining the entries with the same ID. This would be the final Log File after processing "FILE_MINUTE_1.log"

FINAL_FILE_1.log 
20090619
   ID = 0
   TIMESTAMP = 1244127600
   TOTAL = COUNT_1 + COUNT_2
20090619
   ID = 1
   TIMESTAMP = 1244127600
   TOTAL = COUNT_1 + COUNT_2
20090619
   ID = 2
   TIMESTAMP = 1244127600
   TOTAL = COUNT_1    --> COUNT_2 does Not exist
20090619
   ID = 4
   TIMESTAMP = 1244127600
   TOTAL = COUNT_1 + COUNT_2

[download]

From the above file the record with ID=3 doesn't appear since its a pair without the entry "COUNT_1"

My approaches:

1. Put the log entries into a temporary SQL table, and then generate the output based on a Query that joins the entries by ID.

2. Put All the log entries into HASH TABLE like this: 

$hash = (
   'FILE_MINUTE_2' => { 1 => {ID=1, COUNT_1 = 10, COUNT_2 = 20},
                        2 => {ID=2, COUNT_1 = 10, COUNT_2 = undef},
                        3 => {ID=3, COUNT_1 = undef, COUNT_2 = 20},
                        4 => {ID=4, COUNT_1 = 10, COUNT_2 = 20},
                      },
                      

);

[download]

And after reading the LogFiles, then I just need to process the HASH TABLE in order to generate the output file.

Another considerations:

Any tip will be helpful. Tks

In reply to Process Log Files - Join Log entry pairs by gulden

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