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From: Derrick Stolee <stolee@gmail.com>
To: Josh Steadmon <steadmon@google.com>, git@vger.kernel.org
Cc: git@jeffhostetler.com, szeder.dev@gmail.com
Subject: Re: [RFC PATCH v3 3/3] trace2: write overload message to sentinel files
Date: Mon, 16 Sep 2019 08:07:13 -0400	[thread overview]
Message-ID: <2bb4edc6-f35c-e1e2-7957-17fd994707a0@gmail.com> (raw)
In-Reply-To: <bab45cb735ad658e6c838a9b2bdb9a8c74b9d179.1568419818.git.steadmon@google.com>

On 9/13/2019 8:26 PM, Josh Steadmon wrote:
> Add a new "overload" event type for trace2 event destinations. Write
> this event into the sentinel file created by the trace2.maxFiles
> feature. Bump up the event format version since we've added a new event
> type.
> 
> Writing this message into the sentinel file is useful for tracking how
> often the overload protection feature is triggered in practice.

Putting meaningful data into the sentinel file is valuable. It's
important to know a bit about when and why this happened. A user
would be able to inspect the modified time, and the directory info
you include is unnecessary. The data you include is only for the
log aggregator to keep valuable data around overloads.
 
> +`"overload"`::
> +	This event is created in a sentinel file if we are overloading a target
> +	trace directory (see the trace2.maxFiles config option).
> ++
> +------------
> +{
> +	"event":"overload",
> +	...
> +	"dir":"/trace/target/dir/", # The configured trace2 target directory
> +	"evt":"2",		    # EVENT format version
> +}
That said, do we really need to resort to a new event format and
event type? Could we instead use the "data" event with a key
"overload" and put the target dir in the value?

Thanks,
-Stolee

  reply	other threads:[~2019-09-16 12:07 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-29 22:20 [RFC PATCH] trace2: don't overload target directories Josh Steadmon
2019-07-30 13:29 ` Derrick Stolee
2019-07-30 21:52   ` Josh Steadmon
2019-07-30 16:46 ` Jeff Hostetler
2019-07-30 22:01   ` Josh Steadmon
2019-07-30 22:02   ` Josh Steadmon
2019-07-30 18:00 ` Jeff Hostetler
2019-07-30 22:08   ` Josh Steadmon
2019-08-02 22:02 ` [RFC PATCH v2 0/2] " Josh Steadmon
2019-08-02 22:02   ` [RFC PATCH v2 1/2] docs: mention trace2 target-dir mode in git-config Josh Steadmon
2019-08-02 22:02   ` [RFC PATCH v2 2/2] trace2: don't overload target directories Josh Steadmon
2019-08-05 15:34     ` Jeff Hostetler
2019-08-05 18:17       ` Josh Steadmon
2019-08-05 18:01     ` SZEDER Gábor
2019-08-05 18:09       ` Josh Steadmon
2019-09-14  0:25 ` [RFC PATCH v3 0/3] " Josh Steadmon
2019-09-14  0:25   ` [RFC PATCH v3 1/3] docs: mention trace2 target-dir mode in git-config Josh Steadmon
2019-09-14  0:25   ` [RFC PATCH v3 2/3] trace2: don't overload target directories Josh Steadmon
2019-09-14  0:26   ` [RFC PATCH v3 3/3] trace2: write overload message to sentinel files Josh Steadmon
2019-09-16 12:07     ` Derrick Stolee [this message]
2019-09-16 14:11       ` Jeff Hostetler
2019-09-16 18:20         ` Josh Steadmon
2019-09-19 18:23           ` Jeff Hostetler
2019-09-19 22:47             ` Josh Steadmon
2019-09-20 15:59               ` Jeff Hostetler
2019-09-16 18:07       ` Josh Steadmon
2019-10-03 23:32 ` [PATCH v4 0/4] trace2: don't overload target directories Josh Steadmon
2019-10-03 23:32   ` [PATCH v4 1/4] docs: mention trace2 target-dir mode in git-config Josh Steadmon
2019-10-03 23:32   ` [PATCH v4 2/4] docs: clarify trace2 version invariants Josh Steadmon
2019-10-03 23:32   ` [PATCH v4 3/4] trace2: don't overload target directories Josh Steadmon
2019-10-04  0:25     ` Junio C Hamano
2019-10-04 21:57       ` Josh Steadmon
2019-10-04  9:12     ` Johannes Schindelin
2019-10-04 22:05       ` Josh Steadmon
2019-10-03 23:32   ` [PATCH v4 4/4] trace2: write overload message to sentinel files Josh Steadmon
2019-10-04 22:08 ` [PATCH v5 0/4] trace2: discard new traces if the target directory contains too many files Josh Steadmon
2019-10-04 22:08   ` [PATCH v5 1/4] docs: mention trace2 target-dir mode in git-config Josh Steadmon
2019-10-04 22:08   ` [PATCH v5 2/4] docs: clarify trace2 version invariants Josh Steadmon
2019-10-04 22:08   ` [PATCH v5 3/4] trace2: discard new traces if target directory has too many files Josh Steadmon
2019-10-04 22:08   ` [PATCH v5 4/4] trace2: write discard message to sentinel files Josh Steadmon

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