Eevans has uploaded a new change for review. https://gerrit.wikimedia.org/r/292305
Change subject: limit mmap'd disk access to indexes only on Cassandra 2.2 ...................................................................... limit mmap'd disk access to indexes only on Cassandra 2.2 I'm not completely certain what the problem is here, but in our environment where everything is compressed, this effectively undoes the mmap'd reads performed by decompression in 2.2, reverting to the behavior of 2.1. More investigation is needed, but `disk_access_mode: auto` (the default) results in unacceptably high disk read throughput. Bug: T126629 Change-Id: Ic394515e56ab88c0f63caaedd2d18203301bf9bf --- M modules/cassandra/templates/cassandra.yaml-2.2.erb 1 file changed, 3 insertions(+), 0 deletions(-) git pull ssh://gerrit.wikimedia.org:29418/operations/puppet refs/changes/05/292305/1 diff --git a/modules/cassandra/templates/cassandra.yaml-2.2.erb b/modules/cassandra/templates/cassandra.yaml-2.2.erb index f6474e5..4f4d153 100644 --- a/modules/cassandra/templates/cassandra.yaml-2.2.erb +++ b/modules/cassandra/templates/cassandra.yaml-2.2.erb @@ -892,3 +892,6 @@ # below their system default. The sysinternals 'clockres' tool can confirm your system's default # setting. windows_timer_interval: 1 + +# Disable mmap'd data reads until further notice (causing loads of page faults) +disk_access_mode: mmap_index_only -- To view, visit https://gerrit.wikimedia.org/r/292305 To unsubscribe, visit https://gerrit.wikimedia.org/r/settings Gerrit-MessageType: newchange Gerrit-Change-Id: Ic394515e56ab88c0f63caaedd2d18203301bf9bf Gerrit-PatchSet: 1 Gerrit-Project: operations/puppet Gerrit-Branch: production Gerrit-Owner: Eevans <[email protected]> _______________________________________________ MediaWiki-commits mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/mediawiki-commits
