Today, Stack Overflow went read-only in the morning (IST) and came back after some time.

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Now again it went read-only.

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This pertains only to a specific site but the announcements were made on @StackStatus and on stackstatus.net and it is common for the entire network.

Both of them are updated on 21st July and no new information after that. So, the question is:

If the maintenance is for only a specific site, won't it be updated on the above two resources?

  • 4
    Cross site duplication Why is Stack Overflow in read-only mode? – Arulkumar Jul 24 '17 at 14:15
  • @Arulkumar no my question is the bolded text at the bottom(won't the information be added to resources) + that post is made for the morning read-only – Optimus Prime Jul 24 '17 at 14:16
  • 1
    Something not good is going on somewhere in SE, maybe hosting, maybe database.... MSE now suffer from occasional 404 errors as well. Hopefully, they will fix it soon. – Shadow9 Jul 24 '17 at 14:17
  • only happens to SO. not even MSO.(made me think that they are separating SO from other SE sites) – Optimus Prime Jul 24 '17 at 14:18
  • 1
    This was not scheduled - people are looking into the causes. – Oded Jul 24 '17 at 14:19
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    "made me think that they are separating SO from other SE sites", that has been the case for a long time already. – Patrick Hofman Jul 24 '17 at 14:27

This is not planned.

There's an issue with connection pool timeouts I'm investigating. Normally, we disable said spill and opt for a few error pages when it happens over a read-only self-recovery, but due to the dynamics of the data center failover we had this re-enabled. It's just been disabled in a prod build that just went out and I'll be digging into the connection pool issues now.

There are a lot of contributing factors that can funnel into this result. It's ultimately the result of us being efficient here. While that's often a good thing (fewer servers to maintain, buy, etc.), it's not so good for per-server bottlenecks like connection pools. We can push those to the limits fairly routinely. Today, we're pushing way past those limits and I'm currently digging into why.

  • 2
    Any updates? Post mortem? – Shadow9 Jul 24 '17 at 19:19
  • 1
    Any updates on this? – Optimus Prime Jul 31 '17 at 15:23

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