Cassandra node self-removal











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I run Cassandra 3.1 in autoscaling group. Recently one of the machines failed and got replaced. I did not lose any data, but client applications were trying to connect to a node which was marked down.



I am looking for a way to gracefully remove a node from a cluster with a quick command which I would invoke via systemd right before it shuts down cassandra during the shutdown process.



nodetool decommission involves data streaming and takes long time.



nodetool removenode and nodetool assassinate can't remove the node they are running at.




  • Losing data is not my concern. My goal is fully automated node replacement.

  • Fixing client libaries is out of scope of this question






cassandra







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  • 1




    why not simply shutdown machine & call removenode from other?
    – Alex Ott
    Nov 22 at 16:42






  • 1




    Have you looked at the replace_address_first_boot method of replacing nodes? It doesn't cover use cases where you want to scale down (I'd go with Alex's suggestion for that, if you don't care about possibly losing data), but will be much more efficient in cases like the one you describe where the instance gets replaced. cassandra.apache.org/doc/latest/operating/…
    – Justin Cameron
    Nov 23 at 4:29












  • Thanks guys. @AlexOtt : that's what i'm doing right now and i am looking for a way to automate it
    – Volodymyr Linevych
    Nov 23 at 8:57










  • @JustinCameron In this case I have to know the address of a failed node before I start cassandra on a fresh machine. I will go with this option if I find no way to run "quickly deregister myself" command from a node that it being shut down.
    – Volodymyr Linevych
    Nov 23 at 9:00















up vote
0
down vote

favorite












I run Cassandra 3.1 in autoscaling group. Recently one of the machines failed and got replaced. I did not lose any data, but client applications were trying to connect to a node which was marked down.



I am looking for a way to gracefully remove a node from a cluster with a quick command which I would invoke via systemd right before it shuts down cassandra during the shutdown process.



nodetool decommission involves data streaming and takes long time.



nodetool removenode and nodetool assassinate can't remove the node they are running at.




  • Losing data is not my concern. My goal is fully automated node replacement.

  • Fixing client libaries is out of scope of this question






cassandra







share|improve this question


















  • 1




    why not simply shutdown machine & call removenode from other?
    – Alex Ott
    Nov 22 at 16:42






  • 1




    Have you looked at the replace_address_first_boot method of replacing nodes? It doesn't cover use cases where you want to scale down (I'd go with Alex's suggestion for that, if you don't care about possibly losing data), but will be much more efficient in cases like the one you describe where the instance gets replaced. cassandra.apache.org/doc/latest/operating/…
    – Justin Cameron
    Nov 23 at 4:29












  • Thanks guys. @AlexOtt : that's what i'm doing right now and i am looking for a way to automate it
    – Volodymyr Linevych
    Nov 23 at 8:57










  • @JustinCameron In this case I have to know the address of a failed node before I start cassandra on a fresh machine. I will go with this option if I find no way to run "quickly deregister myself" command from a node that it being shut down.
    – Volodymyr Linevych
    Nov 23 at 9:00













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I run Cassandra 3.1 in autoscaling group. Recently one of the machines failed and got replaced. I did not lose any data, but client applications were trying to connect to a node which was marked down.



I am looking for a way to gracefully remove a node from a cluster with a quick command which I would invoke via systemd right before it shuts down cassandra during the shutdown process.



nodetool decommission involves data streaming and takes long time.



nodetool removenode and nodetool assassinate can't remove the node they are running at.




  • Losing data is not my concern. My goal is fully automated node replacement.

  • Fixing client libaries is out of scope of this question






cassandra







share|improve this question













I run Cassandra 3.1 in autoscaling group. Recently one of the machines failed and got replaced. I did not lose any data, but client applications were trying to connect to a node which was marked down.



I am looking for a way to gracefully remove a node from a cluster with a quick command which I would invoke via systemd right before it shuts down cassandra during the shutdown process.



nodetool decommission involves data streaming and takes long time.



nodetool removenode and nodetool assassinate can't remove the node they are running at.




  • Losing data is not my concern. My goal is fully automated node replacement.

  • Fixing client libaries is out of scope of this question






cassandra




cassandra






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 22 at 16:16









Volodymyr Linevych

911210




911210








  • 1




    why not simply shutdown machine & call removenode from other?
    – Alex Ott
    Nov 22 at 16:42






  • 1




    Have you looked at the replace_address_first_boot method of replacing nodes? It doesn't cover use cases where you want to scale down (I'd go with Alex's suggestion for that, if you don't care about possibly losing data), but will be much more efficient in cases like the one you describe where the instance gets replaced. cassandra.apache.org/doc/latest/operating/…
    – Justin Cameron
    Nov 23 at 4:29












  • Thanks guys. @AlexOtt : that's what i'm doing right now and i am looking for a way to automate it
    – Volodymyr Linevych
    Nov 23 at 8:57










  • @JustinCameron In this case I have to know the address of a failed node before I start cassandra on a fresh machine. I will go with this option if I find no way to run "quickly deregister myself" command from a node that it being shut down.
    – Volodymyr Linevych
    Nov 23 at 9:00














  • 1




    why not simply shutdown machine & call removenode from other?
    – Alex Ott
    Nov 22 at 16:42






  • 1




    Have you looked at the replace_address_first_boot method of replacing nodes? It doesn't cover use cases where you want to scale down (I'd go with Alex's suggestion for that, if you don't care about possibly losing data), but will be much more efficient in cases like the one you describe where the instance gets replaced. cassandra.apache.org/doc/latest/operating/…
    – Justin Cameron
    Nov 23 at 4:29












  • Thanks guys. @AlexOtt : that's what i'm doing right now and i am looking for a way to automate it
    – Volodymyr Linevych
    Nov 23 at 8:57










  • @JustinCameron In this case I have to know the address of a failed node before I start cassandra on a fresh machine. I will go with this option if I find no way to run "quickly deregister myself" command from a node that it being shut down.
    – Volodymyr Linevych
    Nov 23 at 9:00








1




1




why not simply shutdown machine & call removenode from other?
– Alex Ott
Nov 22 at 16:42




why not simply shutdown machine & call removenode from other?
– Alex Ott
Nov 22 at 16:42




1




1




Have you looked at the replace_address_first_boot method of replacing nodes? It doesn't cover use cases where you want to scale down (I'd go with Alex's suggestion for that, if you don't care about possibly losing data), but will be much more efficient in cases like the one you describe where the instance gets replaced. cassandra.apache.org/doc/latest/operating/…
– Justin Cameron
Nov 23 at 4:29






Have you looked at the replace_address_first_boot method of replacing nodes? It doesn't cover use cases where you want to scale down (I'd go with Alex's suggestion for that, if you don't care about possibly losing data), but will be much more efficient in cases like the one you describe where the instance gets replaced. cassandra.apache.org/doc/latest/operating/…
– Justin Cameron
Nov 23 at 4:29














Thanks guys. @AlexOtt : that's what i'm doing right now and i am looking for a way to automate it
– Volodymyr Linevych
Nov 23 at 8:57




Thanks guys. @AlexOtt : that's what i'm doing right now and i am looking for a way to automate it
– Volodymyr Linevych
Nov 23 at 8:57












@JustinCameron In this case I have to know the address of a failed node before I start cassandra on a fresh machine. I will go with this option if I find no way to run "quickly deregister myself" command from a node that it being shut down.
– Volodymyr Linevych
Nov 23 at 9:00




@JustinCameron In this case I have to know the address of a failed node before I start cassandra on a fresh machine. I will go with this option if I find no way to run "quickly deregister myself" command from a node that it being shut down.
– Volodymyr Linevych
Nov 23 at 9:00

















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