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Readme for analog3.3

Errors and warnings

This page lists all the errors and warnings which analog can produce, together with a short explanation.

First, you should understand the difference between a crash, an error, a warning, and a debugging message. First, a crash is when analog exits prematurely, without producing the whole output file. The system might give a message, but analog will not give one of its own messages. Analog should never crash. If it does crash, please tell me about it.

An error is something which stops analog finishing its job. Whenever an error is detected, analog gives a message starting something like analog: Fatal error: and will then tell you what type of thing went wrong before quitting.

A warning is a problem which is not fatal to analog: it will keep on with its processing. These vary from the possibly serious, such as files which could not be found, to purely informational. They produce a message starting analog: Warning. You can turn warnings off using the WARNINGS command.

Finally, a debugging message gives information on the state of the program. They just begin with a single code letter followed by a colon. You don't get any debugging messages unless you've asked for them.

Now I shall describe all the possible errors and warnings in detail.


Ran out of memory: cannot continue
Analog ran out of memory. Try increasing the memory available to the process, if your operating system will allow it, or using the LOWMEM commands.
Cannot ignore mandatory configuration file
See the section in the Readme on the mandatory configuration file.
Can't find language file
Language file too short
Language file contains excessively long lines
Analog can't run without a well-formed language file. See the documentation on language files.
Attempted to read more than 50 configuration files
The most likely explanation for this is that you have accidentally created a loop using the CONFIGFILE command.
Incorrect default given in analhead.h
Default given in analhead.h too short
If you've compiled your own version, and you've specified an incorrect configuration in the file analhead.h, analog gives up to allow you to fix it.
Failed to open output file for writing
Analog couldn't create, or couldn't write to, the output file you specified.
Cache output file already exists: won't overwrite
Analog won't overwrite an old cache file. You must move or delete it yourself first.
This can't be what you wanted, because one would overwrite the other.
You requested no output.


Remember that warnings are not fatal, and that you can turn them off using the WARNINGS command. The possible warnings come in several different categories, shown by a letter in the warning message. The categories are as follows.

Category C

This category indicates an incorrect configuration. Analog will either ignore what you said, or try and do the best it can with it. There are too many warnings in this category to list completely. You will have to consult the documentation for the particular configuration command that gave an error. If you get an error for a command which used to work in a previous version of analog, have a look in the section Updating from older versions.

Category D

This is for configurations which might be intended, but which look suspicious.
LOGFORMAT with no subsequent logfile
You have specified a LOGFORMAT command, but no subsequent logfile to which it could be applied. Most likely you put the LOGFORMAT after the LOGFILE command. You must put the LOGFORMAT before the LOGFILE command or use DEFAULTLOGFORMAT instead. See the section on Choosing a logfile for more details.
Offset not a multiple of 30
Offset more than 25 hours
The time offsets are meant to be for correcting between differences in time zones. These differences are usually multiples of 30 minutes between -25 and +25 hours. Maybe you specified the offset in hours instead of minutes by mistake, or something like that.
SORTBY doesn't match FLOOR
SORTBY (or FLOOR) isn't included in COLS
Within one report, it's helpful to your readers to have the sort method and the floor compatible, and both included in the COLS. (See the section on Non-time reports).
Time reports have not all got same value of BACK
It's usually helpful to have all the time reports running in the same direction.
Report contains no COLS
You've got an empty COLS list for one report, so you'll just get a list of names, not any information about them.
LOWMEM 3 prevents that item being cached
You're making a cache file, but one item is not being recorded because of a LOWMEM command, and will therefore not be saved in the cache file.
OUTFILE and CACHEOUTFILE both set to stdout

Category E

There is only one warning in this category.
Redirecting future diagnostic messages
You've used an ERRFILE command to change the destination of errors, warnings, debugging and PROGRESSFREQ diagnostics. This is just warning you so that you don't miss any messages.

Category F

This category is for diagnosing files which couldn't be opened or read successfully. These can be serious, but most of the messages should be self-explanatory. There are two worth mentioning specifically.
Can't auto-detect format of logfile
The LOGFORMAT is set to automatic detection, but the first line of the logfile is not in any of the standard formats. This error can often be generated when you try and specify your own LOGFORMAT but put it after the LOGFILE command so that it is not in effect for that logfile.
DNS lock file already exists
To stop two copies of analog trying to write the DNS file at the same time, an empty "lock file" is created, which tells the second copy of analog to use DNS LOOKUP instead of DNS WRITE. If analog crashes, it may not delete its lock file. So if you get the "already exists" message even though no other copy of analog is running, you may need to delete the lock file yourself.

Category L

When analog finishes reading a logfile, it checks whether there might have been something wrong with it.
Large number of corrupt lines
This could indicate a problem with the logfile, or with the LOGFORMAT specification. The possible causes are described in the page about Choosing a logfile.
Logfiles overlap: possible double counting
Two logfiles which were counting the same type of item overlapped in time. Maybe you read two copies of the same logfile. Or maybe the LOGFORMAT specification should have told analog to ignore some of the items. Or it could be that the logfiles are in fact disjoint and there wasn't really a problem: analog only checks the dates of the logfiles, not the details.

Category M

This category is for warnings about logfile formats which might make analog produce unexpected results.
Logfile contains lines with no [whatevers], which are being filtered
This is usually harmless. It is perhaps best explained by example. Suppose you are excluding certain files from the analysis, but that you are also analysing a browser log which just contains information about the browsers used, not which files they read. Then we can't exclude the browsers which read the excluded files, because we don't know which they were, so all browsers will be included.
Logfile contains lines with no file names (or bytes): page (or byte) counts may be low
If a logfile line doesn't contain a file name, analog will assume that the request wasn't for a page. Similarly, if it doesn't give the number of bytes transferred, analog will make the bytes zero. So the number of page requests or bytes credited to the other items on that line will then be too low.

Category R

This is used when analog turns off an empty report. This could be because none of the relevant items were included in any of the logfiles, or perhaps beacause a LOWMEM command stopped them being recorded.

Broken Pipe

This is not an analog-generated warning, but it can result from analog closing an logfile it's uncompressing without reading the whole of it, when it determines that it will not need it.
Stephen Turner
Personal e-mail: analog-author@lists.isite.net
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