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Active threads waiting on IPC / messagequeuesend - Mailing list pgsql-admin

From Benjamin Leis
Subject Active threads waiting on IPC / messagequeuesend
Date
Msg-id CADP9qHvBGvO_L+G-rG6McAmAdFzLa2Z-scbYi-dOWpduWHbuLw@mail.gmail.com
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I'm looking at a pg_stat_activity dump where there are a group of active threads stuck for a long time in MessageQueueSend

7:52.394089+00 | IPC             | MessageQueueSend | active |             |     27406510 | -5892847938856697008 | SELECT ....

Does this mean they are blocked on clients reading data or does it represent something blocking on the server side?
Thanks
Ben

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