Hi,
StrategyGetBuffer() currently reports "no unpinned buffers available"
using elog(ERROR). As a result, clients receive SQLSTATE XX000
(internal_error), and the message is not translatable.
Although this condition is uncommon, it can occur in user environments,
for example when shared_buffers is configured unusually low. GitLab
encountered this error with a shared_buffers setting of 1 MB:
The analogous local-buffer error, "no empty local buffer available",
is already reported using ERRCODE_INSUFFICIENT_RESOURCES.
This patch changes the shared-buffer error to use ereport() with
ERRCODE_INSUFFICIENT_RESOURCES.
I also considered adding a hint suggesting an increase to
shared_buffers. However, a small shared_buffers setting is not the
only possible cause of this error, so I left the hint out of this
version. I'd welcome thoughts on whether such a hint would be useful.
Best regards,
Xueting Ma
