Redis分布式锁，如何应对长尾词高并发场景？

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java从网络导入以下类：- org.slf4j.Logger- org.slf4j.LoggerFactory- org.springframework.dao.DataAccessException- org.springframework.data.redis.connection.RedisConnection- org.springframework.data.redis.core.RedisCallback

摘自网络

import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.dao.DataAccessException; import org.springframework.data.redis.connection.RedisConnection; import org.springframework.data.redis.core.RedisCallback; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.StringRedisSerializer; /** * redis 实现分布式锁 * * blog * Created with IntelliJ IDEA. * User: JiaLi on 2017/9/29 15:05 */ public class RedisLock { private static Logger logger = LoggerFactory.getLogger(RedisLock.class); private RedisTemplate redisTemplate; private static final int DEFAULT_ACQUIRY_RESOLUTION_MILLIS = 100; /** * Lock key path. */ private String lockKey; /** * 锁超时时间，防止线程在入锁以后，无限的执行等待 */ private int expireMsecs = 60 * 1000; /** * 锁等待时间，防止线程饥饿 */ private int timeoutMsecs = 10 * 1000; private volatile boolean locked = false; /** * Detailed constructor with default acquire timeout 10000 msecs and lock expiration of 60000 * msecs. * * @param lockKey lock key (ex. account:1, ...) */ public RedisLock(RedisTemplate redisTemplate, String lockKey) { this.redisTemplate = redisTemplate; this.lockKey = lockKey + "_lock"; } /** * Detailed constructor with default lock expiration of 60000 msecs. */ public RedisLock(RedisTemplate redisTemplate, String lockKey, int timeoutMsecs) { this(redisTemplate, lockKey); this.timeoutMsecs = timeoutMsecs; } /** * Detailed constructor. */ public RedisLock(RedisTemplate redisTemplate, String lockKey, int timeoutMsecs, int expireMsecs) { this(redisTemplate, lockKey, timeoutMsecs); this.expireMsecs = expireMsecs; } /** * @return lock key */ public String getLockKey() { return lockKey; } private String get(final String key) { Object obj = null; try { obj = redisTemplate.execute(new RedisCallback