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Improve server code to read files as part of a base backup.

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Don't use fread(), since that doesn't necessarily set errno. We could
use read() instead, but it's even better to use pg_pread(), which
allows us to avoid some extra calls to seek to the desired location in
the file.

Also, advertise a wait event while reading from a file, as we do for
most other places where we're reading data from files.

Patch by me, reviewed by Hamid Akhtar.

Discussion: http://postgr.es/m/CA+TgmobBw-3573vMosGj06r72ajHsYeKtksT_oTxH8XvTL7DxA@mail.gmail.com
This commit is contained in:
Robert Haas
2020-06-17 11:39:17 -04:00
parent 453e0e3f0e
commit 2fd2effc50
4 changed files with 86 additions and 67 deletions
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doc/src/sgml/monitoring.sgml
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@ -1193,6 +1193,10 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
</thead>
<tbody>
<row>
<entry><literal>BaseBackupRead</literal></entry>
<entry>Waiting for base backup to read from a file.</entry>
</row>
<row>
<entry><literal>BufFileRead</literal></entry>
<entry>Waiting for a read from a buffered file.</entry>