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Pt stalk flow control rate #49

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Pt stalk flow control rate #49

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2a4ef64
Added pt-stalk-flow-control-rate.sh
jssicam Apr 2, 2019
28555ae
Updated README.md on usage of pt-stalk-flow-control-rate.sh
jssicam Apr 2, 2019
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10 changes: 10 additions & 0 deletions mysql/pt-stalk/trg/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,16 @@
To configure it run:

```
# pt-stalk-flow-control-rate.sh
# Adjust threshold to make pt-stalk trigger when it reaches this value
PT_STALK_PLUGIN='pt-stalk-flow-control-rate.sh'
PTDEST=/tmp/pt/collected/`hostname`/
mkdir -p $PTDEST;
cd /tmp/pt;
wget percona.com/get/pt-stalk https://raw.githubusercontent.com/percona/support-snippets/master/mysql/pt-stalk/trg/$PT_STALK_PLUGIN;
chmod +x pt*;
sudo ./pt-stalk --daemonize --dest=$PTDEST --pid=/tmp/pt/stalk.pid --log=/tmp/pt/stalk.log --function=/tmp/pt/$PT_STALK_PLUGIN --variable='wsrep_flow_control_paused_ns' --threshold=100 --iterations=2 --sleep=30 -- --user=root --password=''

#Adjust to your plugin name
PT_STALK_PLUGIN='pt-stalk-load.sh'
PTDEST=/tmp/pt/collected/`hostname`/
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14 changes: 14 additions & 0 deletions mysql/pt-stalk/trg/pt-stalk-flow-control-rate.sh
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@@ -0,0 +1,14 @@
#!/bin/bash
trg_plugin() {
current_sample_tmp_file="/tmp/pt-stalk-flow-control-rate.dat";
current_sample=$(mysql ${EXT_ARGV} -BNe "SHOW GLOBAL STATUS LIKE 'wsrep_flow_control_paused_ns'" | awk '{ print $2 }');
if [ -f "$current_sample_tmp_file" ]
then
previous_sample=$(cat $current_sample_tmp_file);
echo "$current_sample" > $current_sample_tmp_file;
echo $(( (current_sample - previous_sample) / 1000 / 1000 )) | awk '{ print $1 }';
else
echo "$current_sample" > $current_sample_tmp_file;
echo 0;
fi
}