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From: SATYANARAYANA NARLAPURAM <[email protected]>
To: Lakshmi N <[email protected]>
Cc: [email protected]
Subject: Re: log XLogPrefetch stats at end of recovery
Date: Sat, 21 Mar 2026 01:15:54 -0700
Message-ID: <CAHg+QDfLh-yb+OacN6qPYF6H3SPDmVJUiors7vkSMq4yxfhNrA@mail.gmail.com> (raw)
In-Reply-To: <CA+3i_M-+WVyrRcfnxa4gt+KQUzH-LTQ8D2JCGE_O0WzJJtZfUg@mail.gmail.com>
References: <CA+3i_M-+WVyrRcfnxa4gt+KQUzH-LTQ8D2JCGE_O0WzJJtZfUg@mail.gmail.com>

Hi,

On Wed, Mar 18, 2026 at 12:18 AM Lakshmi N <[email protected]> wrote:

> Hi,
>
> While investigating a long recovery, I noticed that XLogPrefetch stats
> were not logged at the end of recovery. This log message will be useful to
> understand how effective XLogPrefetch was during recovery. Adding a patch
> to address this.
>

Applied this patch and validated the log message. This log message appears
to be useful to me, particularly while doing fleet wide analysis. I am
wondering if we can periodically log this in standby mode as well, not just
before promoting?

2026-03-20 23:33:13.756 PDT [2265441] LOG:  XLogPrefetcher stats:
prefetch=14, hit=6, skip_init=5, skip_new=28, skip_fpw=18, skip_rep=996

Thanks,
Satya

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