Vladislav Vaintroub dab56d5e8e MDEV-23879 server hangs with threadpool, compression, and client pipelining ...

Amend check for unread client data in threadpool.

THD::NET will have unread data, in case client uses compression, and
wraps multiple commands into  a single compression packet

MariaDB C/C sends COM_STMT_RESET+COM_STMT_EXECUTE, and wraps it into
a single compressed packet, when compression is on, thus trying to use
compression and prepared statements against a threadpool-enabled server
will result into a hang, before this patch.

2020-10-03 00:24:53 +02:00

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