Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) The 2019 Stack Overflow Developer Survey Results Are In Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)Recent Reputation History ChangesStack Overflow is getting a Meta of its ownOperation 'Split, All The Metas!' Shall Commence On April 16, 2014Graduation, site closure, and a clearer outlook on the health of SE sitesA Terms of Service update restricting companies that scrape your profile information without your permissionBrief outage planned for Wed, May 3, 2017 at 8pm US/Eastern (00:00 UTC) (like a fire drill for computers)Brief maintenances planned for Sat, July 8 & 22, 2017 both at 14:00 UTC (10AM US/Eastern)Brief maintenances planned for Sat, July 22, 2017 at 00:01 UTC (Fri July 21, 8pm US/Eastern)Planned maintenance scheduled for March 17, 2018 at 13:00 UTC (9AM US/Eastern)Planned maintenance scheduled for July 14, 2018 at 13:00 UTC (9AM US/Eastern)
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Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
The 2019 Stack Overflow Developer Survey Results Are In
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)Recent Reputation History ChangesStack Overflow is getting a Meta of its ownOperation 'Split, All The Metas!' Shall Commence On April 16, 2014Graduation, site closure, and a clearer outlook on the health of SE sitesA Terms of Service update restricting companies that scrape your profile information without your permissionBrief outage planned for Wed, May 3, 2017 at 8pm US/Eastern (00:00 UTC) (like a fire drill for computers)Brief maintenances planned for Sat, July 8 & 22, 2017 both at 14:00 UTC (10AM US/Eastern)Brief maintenances planned for Sat, July 22, 2017 at 00:01 UTC (Fri July 21, 8pm US/Eastern)Planned maintenance scheduled for March 17, 2018 at 13:00 UTC (9AM US/Eastern)Planned maintenance scheduled for July 14, 2018 at 13:00 UTC (9AM US/Eastern)
tl;dr: Planned service interruption that will impact all Stack Overflow/Stack Exchange sites, Jobs, Chat, and Teams. All sites will be read-only for up to an hour during the maintenance. Enterprise cloud hosted instances will not be impacted.
Short Version:
There will be a service degradation for up to an hour this upcoming week - possibly April 17th or 18th, 2019 at 00:00 UTC (8PM US/Eastern). During that time questions and answers will still display, job listings will still work, and job ads will still display. However, the site will be "read only," i.e. people won't appear logged-in, won't be able to add/edit new job listings, apply for jobs, create, edit or vote on questions/comments/answers, reputation won't change, etc. This should minimize the disruption to the majority of casual readers. We will display a banner on the sites stating we're 'read only' for maintenance. We expect that the site will be in a read-only state for less than an hour.
Longer More Technical Version of What’s Happening?
Background
Our primary database servers are currently running on Windows Server 2012. We have two Windows Failover Clusters, one for StackOverflow and one for StackExchange (Careers), each cluster contains 3 database servers. We will be upgrading the servers to Windows Server 2016. During the service interruption, we will be performing a failover of the servers still on Windows 2012 to the servers already on Windows 2016.
What we'll be doing
As mentioned we are using Windows Failover Clustering, along with SQL Server Always On Availability Groups, and Distributed Availability Groups to keep our data in sync across various servers, while giving us redundancy in multiple locations (NY and CO). Starting next week, we will be upgrading the operating systems across these servers to Windows Server 2016.
This upgrades involves many moving pieces, but high-level we will be doing the following next week:
Monday - we will be removing a NY server (currently a secondary) from an existing Windows Failover Cluster. The server will get a clean install of Windows Server 2016, a new Failover Cluster will be created, SQL Server 2017 will be reinstalled, and we will create new Availability Groups and new Distributed Availability Groups. By doing this, this server should start to receive data from the current primary SQL Server i.e. the one still in the old 2012 cluster.
Tuesday - the another NY Secondary will follow the same path as the one on Monday.
Wednesday - the remote secondaries in CO, will be removed from the old 2012 clusters, rebuilt, and put into the new 2016 failover clusters
At this point, we will have a GO / NO-GO on the failover. If everything goes according to plan and we feel comfortable, then we will perform the failover (scheduled maintenance) on Wednesday, April 17. If anything gets delayed or if there are unexpected issues, then we will push the maintenance to Thursday, April 18 or potentially later.
We will not be moving forward with the failover, until we are comfortable.
When we perform the maintenance, we will be pointing the applications to the new 2016 servers and performing a SQL failover of the Distributed Availability Groups. We expect that the site will be in a read-only state for about an hour. During this time, we will be making progress announcements and updates on @StackStatus, so following along there if you're interested.
This is a very complicated move that we are making, which has been fully tested in a lab environment, but you can never be sure of anything during these types of operations. As Nick Craver said:
Everyone has a plan until they get punched in the mouth - Mike Tyson
Questions or concerns?
Please post a comment or answer below; I'll do my best to address any concerns between now and the maintenance window.
discussion featured announcements
asked 2 hours ago
Taryn♦Taryn
32.5k11123184
add a comment |
tl;dr: Planned service interruption that will impact all Stack Overflow/Stack Exchange sites, Jobs, Chat, and Teams. All sites will be read-only for up to an hour during the maintenance. Enterprise cloud hosted instances will not be impacted.
Short Version:
There will be a service degradation for up to an hour this upcoming week - possibly April 17th or 18th, 2019 at 00:00 UTC (8PM US/Eastern). During that time questions and answers will still display, job listings will still work, and job ads will still display. However, the site will be "read only," i.e. people won't appear logged-in, won't be able to add/edit new job listings, apply for jobs, create, edit or vote on questions/comments/answers, reputation won't change, etc. This should minimize the disruption to the majority of casual readers. We will display a banner on the sites stating we're 'read only' for maintenance. We expect that the site will be in a read-only state for less than an hour.
Longer More Technical Version of What’s Happening?
Background
Our primary database servers are currently running on Windows Server 2012. We have two Windows Failover Clusters, one for StackOverflow and one for StackExchange (Careers), each cluster contains 3 database servers. We will be upgrading the servers to Windows Server 2016. During the service interruption, we will be performing a failover of the servers still on Windows 2012 to the servers already on Windows 2016.
What we'll be doing
As mentioned we are using Windows Failover Clustering, along with SQL Server Always On Availability Groups, and Distributed Availability Groups to keep our data in sync across various servers, while giving us redundancy in multiple locations (NY and CO). Starting next week, we will be upgrading the operating systems across these servers to Windows Server 2016.
This upgrades involves many moving pieces, but high-level we will be doing the following next week:
Monday - we will be removing a NY server (currently a secondary) from an existing Windows Failover Cluster. The server will get a clean install of Windows Server 2016, a new Failover Cluster will be created, SQL Server 2017 will be reinstalled, and we will create new Availability Groups and new Distributed Availability Groups. By doing this, this server should start to receive data from the current primary SQL Server i.e. the one still in the old 2012 cluster.
Tuesday - the another NY Secondary will follow the same path as the one on Monday.
Wednesday - the remote secondaries in CO, will be removed from the old 2012 clusters, rebuilt, and put into the new 2016 failover clusters
At this point, we will have a GO / NO-GO on the failover. If everything goes according to plan and we feel comfortable, then we will perform the failover (scheduled maintenance) on Wednesday, April 17. If anything gets delayed or if there are unexpected issues, then we will push the maintenance to Thursday, April 18 or potentially later.
We will not be moving forward with the failover, until we are comfortable.
When we perform the maintenance, we will be pointing the applications to the new 2016 servers and performing a SQL failover of the Distributed Availability Groups. We expect that the site will be in a read-only state for about an hour. During this time, we will be making progress announcements and updates on @StackStatus, so following along there if you're interested.
This is a very complicated move that we are making, which has been fully tested in a lab environment, but you can never be sure of anything during these types of operations. As Nick Craver said:
Everyone has a plan until they get punched in the mouth - Mike Tyson
Questions or concerns?
Please post a comment or answer below; I'll do my best to address any concerns between now and the maintenance window.
discussion featured announcements
asked 2 hours ago
Taryn♦Taryn
32.5k11123184
3
I'll cross some fingers for you :P
– Tim Stone
1 hour ago
@TimStone We need more than that. :)
– Taryn♦
1 hour ago
1
Alright alright, I'll go buy some rum or something too
– Tim Stone
1 hour ago
12
As you also take out chat, any chance we might be watching all of this in a live stream? Or do you expect us to go outside, get some fresh air and ... shrug talk to real people during that hour?
– rene
1 hour ago
2
@rene I don't think there will be a livestream this time around, unless something changes between now and maintenance day. There are a ton of moving parts and that adds another layer of stuff.
– Taryn♦
1 hour ago
add a comment |
tl;dr: Planned service interruption that will impact all Stack Overflow/Stack Exchange sites, Jobs, Chat, and Teams. All sites will be read-only for up to an hour during the maintenance. Enterprise cloud hosted instances will not be impacted.
Short Version:
There will be a service degradation for up to an hour this upcoming week - possibly April 17th or 18th, 2019 at 00:00 UTC (8PM US/Eastern). During that time questions and answers will still display, job listings will still work, and job ads will still display. However, the site will be "read only," i.e. people won't appear logged-in, won't be able to add/edit new job listings, apply for jobs, create, edit or vote on questions/comments/answers, reputation won't change, etc. This should minimize the disruption to the majority of casual readers. We will display a banner on the sites stating we're 'read only' for maintenance. We expect that the site will be in a read-only state for less than an hour.
Longer More Technical Version of What’s Happening?
Background
Our primary database servers are currently running on Windows Server 2012. We have two Windows Failover Clusters, one for StackOverflow and one for StackExchange (Careers), each cluster contains 3 database servers. We will be upgrading the servers to Windows Server 2016. During the service interruption, we will be performing a failover of the servers still on Windows 2012 to the servers already on Windows 2016.
What we'll be doing
As mentioned we are using Windows Failover Clustering, along with SQL Server Always On Availability Groups, and Distributed Availability Groups to keep our data in sync across various servers, while giving us redundancy in multiple locations (NY and CO). Starting next week, we will be upgrading the operating systems across these servers to Windows Server 2016.
This upgrades involves many moving pieces, but high-level we will be doing the following next week:
Monday - we will be removing a NY server (currently a secondary) from an existing Windows Failover Cluster. The server will get a clean install of Windows Server 2016, a new Failover Cluster will be created, SQL Server 2017 will be reinstalled, and we will create new Availability Groups and new Distributed Availability Groups. By doing this, this server should start to receive data from the current primary SQL Server i.e. the one still in the old 2012 cluster.
Tuesday - the another NY Secondary will follow the same path as the one on Monday.
Wednesday - the remote secondaries in CO, will be removed from the old 2012 clusters, rebuilt, and put into the new 2016 failover clusters
At this point, we will have a GO / NO-GO on the failover. If everything goes according to plan and we feel comfortable, then we will perform the failover (scheduled maintenance) on Wednesday, April 17. If anything gets delayed or if there are unexpected issues, then we will push the maintenance to Thursday, April 18 or potentially later.
We will not be moving forward with the failover, until we are comfortable.
When we perform the maintenance, we will be pointing the applications to the new 2016 servers and performing a SQL failover of the Distributed Availability Groups. We expect that the site will be in a read-only state for about an hour. During this time, we will be making progress announcements and updates on @StackStatus, so following along there if you're interested.
This is a very complicated move that we are making, which has been fully tested in a lab environment, but you can never be sure of anything during these types of operations. As Nick Craver said:
Everyone has a plan until they get punched in the mouth - Mike Tyson
Questions or concerns?
Please post a comment or answer below; I'll do my best to address any concerns between now and the maintenance window.
discussion featured announcements
asked 2 hours ago
Taryn♦Taryn
32.5k11123184
tl;dr: Planned service interruption that will impact all Stack Overflow/Stack Exchange sites, Jobs, Chat, and Teams. All sites will be read-only for up to an hour during the maintenance. Enterprise cloud hosted instances will not be impacted.
Short Version:
There will be a service degradation for up to an hour this upcoming week - possibly April 17th or 18th, 2019 at 00:00 UTC (8PM US/Eastern). During that time questions and answers will still display, job listings will still work, and job ads will still display. However, the site will be "read only," i.e. people won't appear logged-in, won't be able to add/edit new job listings, apply for jobs, create, edit or vote on questions/comments/answers, reputation won't change, etc. This should minimize the disruption to the majority of casual readers. We will display a banner on the sites stating we're 'read only' for maintenance. We expect that the site will be in a read-only state for less than an hour.
Longer More Technical Version of What’s Happening?
Background
Our primary database servers are currently running on Windows Server 2012. We have two Windows Failover Clusters, one for StackOverflow and one for StackExchange (Careers), each cluster contains 3 database servers. We will be upgrading the servers to Windows Server 2016. During the service interruption, we will be performing a failover of the servers still on Windows 2012 to the servers already on Windows 2016.
What we'll be doing
As mentioned we are using Windows Failover Clustering, along with SQL Server Always On Availability Groups, and Distributed Availability Groups to keep our data in sync across various servers, while giving us redundancy in multiple locations (NY and CO). Starting next week, we will be upgrading the operating systems across these servers to Windows Server 2016.
This upgrades involves many moving pieces, but high-level we will be doing the following next week:
Monday - we will be removing a NY server (currently a secondary) from an existing Windows Failover Cluster. The server will get a clean install of Windows Server 2016, a new Failover Cluster will be created, SQL Server 2017 will be reinstalled, and we will create new Availability Groups and new Distributed Availability Groups. By doing this, this server should start to receive data from the current primary SQL Server i.e. the one still in the old 2012 cluster.
Tuesday - the another NY Secondary will follow the same path as the one on Monday.
Wednesday - the remote secondaries in CO, will be removed from the old 2012 clusters, rebuilt, and put into the new 2016 failover clusters
At this point, we will have a GO / NO-GO on the failover. If everything goes according to plan and we feel comfortable, then we will perform the failover (scheduled maintenance) on Wednesday, April 17. If anything gets delayed or if there are unexpected issues, then we will push the maintenance to Thursday, April 18 or potentially later.
We will not be moving forward with the failover, until we are comfortable.
When we perform the maintenance, we will be pointing the applications to the new 2016 servers and performing a SQL failover of the Distributed Availability Groups. We expect that the site will be in a read-only state for about an hour. During this time, we will be making progress announcements and updates on @StackStatus, so following along there if you're interested.
This is a very complicated move that we are making, which has been fully tested in a lab environment, but you can never be sure of anything during these types of operations. As Nick Craver said:
Everyone has a plan until they get punched in the mouth - Mike Tyson
Questions or concerns?
Please post a comment or answer below; I'll do my best to address any concerns between now and the maintenance window.
discussion featured announcements
discussion featured announcements
asked 2 hours ago
Taryn♦Taryn
32.5k11123184
asked 2 hours ago
Taryn♦Taryn
32.5k11123184
edited 1 hour ago
Taryn
asked 2 hours ago
Taryn♦Taryn
32.5k11123184
asked 2 hours ago
Taryn♦Taryn
32.5k11123184
asked 2 hours ago
Taryn♦Taryn
32.5k11123184
32.5k11123184
3
I'll cross some fingers for you :P
– Tim Stone
1 hour ago
@TimStone We need more than that. :)
– Taryn♦
1 hour ago
1
Alright alright, I'll go buy some rum or something too
– Tim Stone
1 hour ago
12
As you also take out chat, any chance we might be watching all of this in a live stream? Or do you expect us to go outside, get some fresh air and ... shrug talk to real people during that hour?
– rene
1 hour ago
2
@rene I don't think there will be a livestream this time around, unless something changes between now and maintenance day. There are a ton of moving parts and that adds another layer of stuff.
– Taryn♦
1 hour ago
add a comment |
3
I'll cross some fingers for you :P
– Tim Stone
1 hour ago
@TimStone We need more than that. :)
– Taryn♦
1 hour ago
1
Alright alright, I'll go buy some rum or something too
– Tim Stone
1 hour ago
12
As you also take out chat, any chance we might be watching all of this in a live stream? Or do you expect us to go outside, get some fresh air and ... shrug talk to real people during that hour?
– rene
1 hour ago
2
@rene I don't think there will be a livestream this time around, unless something changes between now and maintenance day. There are a ton of moving parts and that adds another layer of stuff.
– Taryn♦
1 hour ago
3
3
I'll cross some fingers for you :P
– Tim Stone
1 hour ago
I'll cross some fingers for you :P
– Tim Stone
1 hour ago
@TimStone We need more than that. :)
– Taryn♦
1 hour ago
@TimStone We need more than that. :)
– Taryn♦
1 hour ago
1
1
Alright alright, I'll go buy some rum or something too
– Tim Stone
1 hour ago
Alright alright, I'll go buy some rum or something too
– Tim Stone
1 hour ago
12
12
As you also take out chat, any chance we might be watching all of this in a live stream? Or do you expect us to go outside, get some fresh air and ... shrug talk to real people during that hour?
– rene
1 hour ago
As you also take out chat, any chance we might be watching all of this in a live stream? Or do you expect us to go outside, get some fresh air and ... shrug talk to real people during that hour?
– rene
1 hour ago
2
2
@rene I don't think there will be a livestream this time around, unless something changes between now and maintenance day. There are a ton of moving parts and that adds another layer of stuff.
– Taryn♦
1 hour ago
@rene I don't think there will be a livestream this time around, unless something changes between now and maintenance day. There are a ton of moving parts and that adds another layer of stuff.
– Taryn♦
1 hour ago
add a comment |
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3
I'll cross some fingers for you :P
– Tim Stone
1 hour ago
@TimStone We need more than that. :)
– Taryn♦
1 hour ago
1
Alright alright, I'll go buy some rum or something too
– Tim Stone
1 hour ago
12
As you also take out chat, any chance we might be watching all of this in a live stream? Or do you expect us to go outside, get some fresh air and ... shrug talk to real people during that hour?
– rene
1 hour ago
2
@rene I don't think there will be a livestream this time around, unless something changes between now and maintenance day. There are a ton of moving parts and that adds another layer of stuff.
– Taryn♦
1 hour ago