From 8b2d4047774ead6223adf2b98e30b9e6ca9ca3d2 Mon Sep 17 00:00:00 2001 From: Mike Bayer Date: Mon, 3 Jul 2017 10:35:30 -0400 Subject: Add option for innodb_flush_log_at_trx_commit = 2 for Galera only The innodb_flush_log_at_trx_commit flag changes the timing of when the log buffer is written to disk for writes. At its default of 1, transactions are written to disk and the buffer flushed on a per-transaction basis; but when set to 2, the flush of the buffer proceeds only once per second. This removes the durability guarantee for the single node. However the central concept of Galera is that durability is achieved via the cluster as a whole, in that transactions are replicated to other nodes before the commit succeeds (though not necessarily written to disk unless wsrep_causal_reads is set). In this model, data would only be lost of all nodes of the Galera cluster were killed within one second of each other. Percona's blog post at https://www.percona.com/blog/2014/11/17/typical-misconceptions-on-galera-for-mysql/ recommends that the value of 2 should be considered "safe" for a Galera cluster unless you are in fact worried that all three nodes will be powered off simultaneously. The value here is added as an option only, defaulting to the usual default of "1", flush per transaction. Change-Id: Id5a30f1daf978e094a74db2d284febbc9ae64bb3 --- manifests/profile/pacemaker/database/mysql.pp | 79 +++++++++++++++------------ 1 file changed, 44 insertions(+), 35 deletions(-) (limited to 'manifests/profile') diff --git a/manifests/profile/pacemaker/database/mysql.pp b/manifests/profile/pacemaker/database/mysql.pp index 22adbe9..b9f2a65 100644 --- a/manifests/profile/pacemaker/database/mysql.pp +++ b/manifests/profile/pacemaker/database/mysql.pp @@ -52,6 +52,13 @@ # connections from other nodes in the cluster. # Defaults to hiera('mysql_bind_host') # +# [*innodb_flush_log_at_trx_commit*] +# (Optional) Disk flush behavior for MySQL under Galera. A value of +# '1' indicates flush to disk per transaction. A value of '2' indicates +# flush to disk every second, flushing all unflushed transactions in +# one step. +# Defaults to hiera('innodb_flush_log_at_trx_commit', '1') +# # [*step*] # (Optional) The current step in deployment. See tripleo-heat-templates # for more details. @@ -62,14 +69,15 @@ # Defaults to hiera('pcs_tries', 20) # class tripleo::profile::pacemaker::database::mysql ( - $bootstrap_node = hiera('mysql_short_bootstrap_node_name'), - $bind_address = $::hostname, - $ca_file = undef, - $certificate_specs = hiera('tripleo::profile::base::database::mysql::certificate_specs', {}), - $enable_internal_tls = hiera('enable_internal_tls', false), - $gmcast_listen_addr = hiera('mysql_bind_host'), - $step = Integer(hiera('step')), - $pcs_tries = hiera('pcs_tries', 20), + $bootstrap_node = hiera('mysql_short_bootstrap_node_name'), + $bind_address = $::hostname, + $ca_file = undef, + $certificate_specs = hiera('tripleo::profile::base::database::mysql::certificate_specs', {}), + $enable_internal_tls = hiera('enable_internal_tls', false), + $gmcast_listen_addr = hiera('mysql_bind_host'), + $innodb_flush_log_at_trx_commit = hiera('innodb_flush_log_at_trx_commit', '1'), + $step = Integer(hiera('step')), + $pcs_tries = hiera('pcs_tries', 20), ) { if $::hostname == downcase($bootstrap_node) { $pacemaker_master = true @@ -109,33 +117,34 @@ class tripleo::profile::pacemaker::database::mysql ( $mysqld_options = { 'mysqld' => { - 'skip-name-resolve' => '1', - 'binlog_format' => 'ROW', - 'default-storage-engine' => 'innodb', - 'innodb_autoinc_lock_mode' => '2', - 'innodb_locks_unsafe_for_binlog'=> '1', - 'innodb_file_per_table' => 'ON', - 'query_cache_size' => '0', - 'query_cache_type' => '0', - 'bind-address' => $bind_address, - 'max_connections' => hiera('mysql_max_connections'), - 'open_files_limit' => '-1', - 'wsrep_on' => 'ON', - 'wsrep_provider' => '/usr/lib64/galera/libgalera_smm.so', - 'wsrep_cluster_name' => 'galera_cluster', - 'wsrep_cluster_address' => "gcomm://${galera_nodes}", - 'wsrep_slave_threads' => '1', - 'wsrep_certify_nonPK' => '1', - 'wsrep_max_ws_rows' => '131072', - 'wsrep_max_ws_size' => '1073741824', - 'wsrep_debug' => '0', - 'wsrep_convert_LOCK_to_trx' => '0', - 'wsrep_retry_autocommit' => '1', - 'wsrep_auto_increment_control' => '1', - 'wsrep_drupal_282555_workaround'=> '0', - 'wsrep_causal_reads' => '0', - 'wsrep_sst_method' => 'rsync', - 'wsrep_provider_options' => "gmcast.listen_addr=tcp://${gmcast_listen_addr}:4567;${tls_options}", + 'skip-name-resolve' => '1', + 'binlog_format' => 'ROW', + 'default-storage-engine' => 'innodb', + 'innodb_autoinc_lock_mode' => '2', + 'innodb_locks_unsafe_for_binlog' => '1', + 'innodb_file_per_table' => 'ON', + 'innodb_flush_log_at_trx_commit' => $innodb_flush_log_at_trx_commit, + 'query_cache_size' => '0', + 'query_cache_type' => '0', + 'bind-address' => $bind_address, + 'max_connections' => hiera('mysql_max_connections'), + 'open_files_limit' => '-1', + 'wsrep_on' => 'ON', + 'wsrep_provider' => '/usr/lib64/galera/libgalera_smm.so', + 'wsrep_cluster_name' => 'galera_cluster', + 'wsrep_cluster_address' => "gcomm://${galera_nodes}", + 'wsrep_slave_threads' => '1', + 'wsrep_certify_nonPK' => '1', + 'wsrep_max_ws_rows' => '131072', + 'wsrep_max_ws_size' => '1073741824', + 'wsrep_debug' => '0', + 'wsrep_convert_LOCK_to_trx' => '0', + 'wsrep_retry_autocommit' => '1', + 'wsrep_auto_increment_control' => '1', + 'wsrep_drupal_282555_workaround' => '0', + 'wsrep_causal_reads' => '0', + 'wsrep_sst_method' => 'rsync', + 'wsrep_provider_options' => "gmcast.listen_addr=tcp://${gmcast_listen_addr}:4567;${tls_options}", } } -- cgit 1.2.3-korg