突然，我的zookeeper启动速度变慢，我检查了日志并找到
**1** Mon Apr 1 16:33:13 CST 2019 Starting zookeeper on hadoop11
**2** core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 2065499
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 102400
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
**3** 2019-04-01 16:33:34,280 INFO [main] quorum.QuorumPeer: Resolved hostname: hbase1 to address: hbase1/127.0.0.1
log＃1和log＃3的时间间隔为23s。
通常情况下，时间间隔只有3s。
缓慢的ZK会使HMaster启动失败：
2019-04-01 16:33:35,341 ERROR [main] master.HMasterCommandLine: Master exiting
java.lang.RuntimeException: Failed construction of Master: class org.apache.hadoop.hbase.master.HMaster.
at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:3201)
at org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMasterCommandLine.java:236)
at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:140)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:149)
at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:3212)
Caused by: org.apache.hadoop.hbase.ZooKeeperConnectionException: master:160000x0, quorum=hadoop11:2181, baseZNode=/hbase Unexpected KeeperException creating base node
我对慢速情况一无所知。以前的ZK可以，但是突然变得无法快速启动。