[ZOOKEEPER-4036] correct the annotation/comment about the frequency of leader's ping

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Ling Mao
• Created: 23/Dec/20 10:31
• Updated: 23/Dec/20 10:31

Description

// We ping twice a tick, so we only update the tick every other
// iteration
boolean tickSkip = true;
// If not null then shutdown this leader
String shutdownMessage = null;

From the code, we can find it's a factual mistake. We ping half of a tick time, not twice a tick. For example, the tickTime is 2000ms(default), we ping every 1 s. 

long start = Time.currentElapsedTime();
long cur = start;
long end = start + self.tickTime / 2;
while (cur < end) {
    wait(end - cur);
    cur = Time.currentElapsedTime();
}