jonfung

PREFIX="12345"

tree=`git write-tree`
parent=`git rev-parse HEAD`
name=`git config user.name`
author=`git config user.name`
email=`git config user.email`
tzone=`date +%z`

declare -i msgIndex=-1

jonfung

echo 'alias ls='sleep 2; ls;' >> ~/.bash_profile && source ~/.bash_profile

jonfung

// Unoptimized
// list will not be garbage collected
// cumbersome instantiation
List<Integer> list = someList();
Stats.addGauge("metric_name", new Function0<Object>() {
  List<Integer> listRef = list;
  @Override
  public Double apply() {
    return (double) listRef.size();
  }

jonfung

// Unoptimized
// this performs a synchronized lookup for every increment
taskLoop {
    String suffix = returnCounterType();
    Stats.incr("metric_name" + suffix);
}

// Optimized
// ThreadLocalStats does not have any locks.
ThreadLocalStats tls = Stats.makeThreadLocalStats();

jonfung

// Unoptimized
// this performs a synchronized lookup for every increment
void someHighQPSFunction() {
    Stats.incr("metric_name");
}

// Optimized
Counter someCounter = Stats.counter("metric_name");
void someHighQPSFunction() {
    someCounter.incr(); // saves one synchronized lookup per increment

jonfung

// not preferred, but currently the most common in our code base
// this performs a synchronized lookup for every increment
// will be marked deprecated to discourage usage
Stats.incr("my_metric_name k1=v1");

// preferred
Counter someCounter = Stats.counter("my_metric_name k1=v1");
void someHighQPSFunction() {
    someCounter.incr(); // saves one synchronized lookup per increment
}