[asterisk-dev] [Code Review] 2880: CDRs: prevent backend modules from unregistering while active CDRs are in flight

[Corey Farrell]

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Ship it!


Thanks for addressing all of my issues.  One last comment might be nothing.


/branches/12/main/cdr.c
<https://reviewboard.asterisk.org/r/2880/#comment19182>

    ao2_container_count in asterisk 12+ uses ast_atomic_fetchadd_int, assuming this patch is only for 12+ then maybe ao2_lock/ao2_unlock is not needed?


- Corey Farrell


On Oct. 15, 2013, 7:18 a.m., Matt Jordan wrote:
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> (Updated Oct. 15, 2013, 7:18 a.m.)
> 
> 
> Review request for Asterisk Developers.
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> Repository: Asterisk
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> Description
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> During shutdown, Asterisk attempts to flush out any active CDRs by calling ast_cdr_engine_term. This is to try to get as much billing data recorded as possible before Asterisk shuts down/restarts and that data is lost. Unfortunately, module unloading occurs prior to calling ast_cdr_engine_term, and the CDR backend modules have already unregistered themselves. Thus, while the records are successfully flushed from the system, there are no registered backends left to handle the data.
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> This is technically a problem in prior versions of Asterisk as well; however, it is far less likely to occur in Asterisk 1.8/11 due to CDRs being build on an asynchronous message bus in Asterisk 12.
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> This patch modified ast_cdr_unregister such that if active_cdrs_by_channel has an entry, the unregistration fails. This would have the side effect of preventing CDR module unloading via the CLI on a busy system - but if you're doing that, you're already losing billing data, so that seems like a very bad idea anyway.
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> 
> Diffs
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>   /branches/12/addons/cdr_mysql.c 400957 
>   /branches/12/cdr/cdr_adaptive_odbc.c 400957 
>   /branches/12/cdr/cdr_csv.c 400957 
>   /branches/12/cdr/cdr_custom.c 400957 
>   /branches/12/cdr/cdr_manager.c 400957 
>   /branches/12/cdr/cdr_odbc.c 400957 
>   /branches/12/cdr/cdr_pgsql.c 400957 
>   /branches/12/cdr/cdr_radius.c 400957 
>   /branches/12/cdr/cdr_sqlite.c 400957 
>   /branches/12/cdr/cdr_sqlite3_custom.c 400957 
>   /branches/12/cdr/cdr_syslog.c 400957 
>   /branches/12/cdr/cdr_tds.c 400957 
>   /branches/12/include/asterisk/cdr.h 400957 
>   /branches/12/main/cdr.c 400957 
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> Diff: https://reviewboard.asterisk.org/r/2880/diff/
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> 
> Testing
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> The various dial tests that have a tendency to end very quickly while CDR data is in flight now pass consistently.
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> 
> Thanks,
> 
> Matt Jordan
> 
>

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