Zookeeper zk_max_latency如何计算? [英] How is Zookeeper zk_max_latency calculated?
问题描述
我刚刚删除了我的动物园管理员的一些数据……
Hi I just took some stats off my zookeeper...
您可以看到zk_max_latency很高.但这是曾经达到的最大值还是始终是当前值?
As you can see zk_max_latency is quite high. But is that the maximum it ever reached or is it always the current value?
echo mntr | nc localhost 2181
zk_version 3.4.13-2d71af4dbe22557fda74f9a9b4309b15a7487f03, built on 06/29/2018 04:05 GMT
zk_avg_latency 0
zk_max_latency 4738
zk_min_latency 0
zk_packets_received 2387852
zk_packets_sent 2387928
zk_num_alive_connections 29
zk_outstanding_requests 0
zk_server_state follower
zk_znode_count 7973
zk_watch_count 74
zk_ephemerals_count 22
zk_approximate_data_size 12356979
zk_open_file_descriptor_count 62
zk_max_file_descriptor_count 16384
zk_fsync_threshold_exceed_count 2
推荐答案
zk_max | avg | min_latency
指标是从ZK服务器启动开始计算的.
The zk_max|avg|min_latency
metric is calculated starting from ZK server startup.
mntr
命令由 ZooKeeperServer.serverStats.requestLatency >
The mntr
command is handled by MonitorCommand, which query the max/avg/min request metrics from ZooKeeperServer.serverStats.requestLatency
ZKDatabase zkdb = zkServer.getZKDatabase();
ServerStats stats = zkServer.serverStats();
print("version", Version.getFullVersion());
print("avg_latency", stats.getAvgLatency());
print("max_latency", stats.getMaxLatency());
print("min_latency", stats.getMinLatency());
ServerStats.java
ServerStats.java
// getters
public long getMinLatency() {
return requestLatency.getMin();
}
public double getAvgLatency() {
return requestLatency.getAvg();
}
public long getMaxLatency() {
return requestLatency.getMax();
}
并且请求延迟在 AvgMinMaxCounter .
And the request latency is updated at ServerStats.updateLatency(). The core implementation class is AvgMinMaxCounter.
public void updateLatency(Request request, long currentTime) {
long latency = currentTime - request.createTime;
if (latency < 0) {
return;
}
requestLatency.addDataPoint(latency);
if (request.getHdr() != null) {
// Only quorum request should have header
ServerMetrics.UPDATE_LATENCY.add(latency);
} else {
// All read request should goes here
ServerMetrics.READ_LATENCY.add(latency);
}
}
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