Thanks Gary, indeed I forced a timestamp into the string passed to the
log and, comparing it with the log timestamp itself, the difference is
within 1 ms.
Regards
Fabio
On 01/26/2015 01:44 PM, Gary Gregory wrote:
On Mon, Jan 26, 2015 at 3:44 AM, Fabio <[email protected]> wrote:
Hi everyone,
I am using Hadoop, that uses log4j as logging system.
Since I don't know anything about how log4j works, and since I am relying
on the logs for my work, I would like to ask you how reliable is the
timestamp I see in the logs.
Is each timestamp I see the exact real system time at which each
"LOG.info(...)" function is called within the Hadoop code?
Yes. The info() call creates a log event object which includes a timestamp.
Exactly when the log event is used and how is up to each appender
implementation.
Gary
Or is the log request enqueued in some buffer so that the timestamp
includes some delay to process the entries in this buffer?
I asked this in the Hadoop mailing list but with no answer, hope to have
more luck here.
Thanks in advance
Fabio
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