Couchbase Server

Allow disk write queue cap to be modified at runtime

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Thuan Nguyen added a comment -
Integrated in github-ep-engine-2-0 #131 (See [http://qa.hq.northscale.net/job/github-ep-engine-2-0/131/])
    
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Thuan Nguyen added a comment - Integrated in github-ep-engine-2-0 #131 (See [ http://qa.hq.northscale.net/job/github-ep-engine-2-0/131/ ])     
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Perry Krug added a comment -
This behavior needs to be changed.

The current method is to use '-1' to disable the cap completely, but there are a variety of problems with that including the fact that cbflushctl can't be used to actually set a -1:
[perry@Membase1 ~]$ /opt/couchbase/bin/cbflushctl localhost:11210 set tap_throttle_queue_cap "-1"
usage: cbflushctl [options]

cbflushctl: error: no such option: -1

Please change it so that a value of '0' disables the cap
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Perry Krug added a comment - This behavior needs to be changed. The current method is to use '-1' to disable the cap completely, but there are a variety of problems with that including the fact that cbflushctl can't be used to actually set a -1: [ perry@Membase1 ~]$ /opt/couchbase/bin/cbflushctl localhost:11210 set tap_throttle_queue_cap "-1" usage: cbflushctl [options] cbflushctl: error: no such option: -1 Please change it so that a value of '0' disables the cap
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Mike Wiederhold added a comment -
We would rather fix cbflushctl in this case since it should be able to accept negative numbers. Setting the tap_throttle_queue_cap to -1 works in ep-engine.
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Mike Wiederhold added a comment - We would rather fix cbflushctl in this case since it should be able to accept negative numbers. Setting the tap_throttle_queue_cap to -1 works in ep-engine.
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Perry Krug added a comment -
I also tried to set it at the Erlang level with:
wget -O- --user=<user> --password=<pass> --post-data='ns_bucket:update_bucket_props("default", [{extra_config_string, "tap_throttle_queue_cap=-1"}]).' http://localhost:8091/diag/eval

And the memcached process failed to start with this message in the logs;

[user:info] [2012-01-17 13:53:41] [ns_1@127.0.0.1:<0.8646.1>:ns_port_server:handle_info:96] Port server memcached on node 'ns_1@127.0.0.1' exited with status 139. Restarting. Messages: Invalid entry, Key: <tap_throttle_queue_cap> Value: <-1>

Since this works fine with a value other than -1, I assumed the problem was not just with cbflushctl...
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Perry Krug added a comment - I also tried to set it at the Erlang level with: wget -O- --user=<user> --password=<pass> --post-data='ns_bucket:update_bucket_props("default", [{extra_config_string, "tap_throttle_queue_cap=-1"}]).' http://localhost:8091/diag/eval And the memcached process failed to start with this message in the logs; [user:info] [2012-01-17 13:53:41] [ ns_1@127.0.0.1 :<0.8646.1>:ns_port_server:handle_info:96] Port server memcached on node ' ns_1@127.0.0.1 ' exited with status 139. Restarting. Messages: Invalid entry, Key: <tap_throttle_queue_cap> Value: <-1> Since this works fine with a value other than -1, I assumed the problem was not just with cbflushctl...
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Steve Yen added a comment -
Reassigning to Jin, regarding the -1.
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Steve Yen added a comment - Reassigning to Jin, regarding the -1.
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Farshid Ghods added a comment -
we should also add this to documentation.
adding MC to the ticket
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Farshid Ghods added a comment - we should also add this to documentation. adding MC to the ticket
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Thuan Nguyen added a comment -
Integrated in github-ep-engine-2-0 #282 (See [http://qa.hq.northscale.net/job/github-ep-engine-2-0/282/])
    MB-4418: tap_throttle_queue_cap in cbflushctl takes 'infinite' argument (Revision 7c4203378ab21f598247b88eefddf7d55e0bf124)

     Result = SUCCESS
Mike Wiederhold :
Files :
* management/cbflushctl
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Thuan Nguyen added a comment - Integrated in github-ep-engine-2-0 #282 (See [ http://qa.hq.northscale.net/job/github-ep-engine-2-0/282/ ])      MB-4418 : tap_throttle_queue_cap in cbflushctl takes 'infinite' argument (Revision 7c4203378ab21f598247b88eefddf7d55e0bf124)      Result = SUCCESS Mike Wiederhold : Files : * management/cbflushctl

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  • Assignee:
    Mike Wiederhold
    Reporter:
    Perry Krug
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