Spring Cloud中Hystrix 线程隔离导致ThreadLocal数据丢失问题分析

妖狐艹你老母 2021-11-10 07:44 398阅读 0赞

最近spring boot项目中由于使用了spring cloud 的hystrix 导致了threadLocal中数据丢失，其实具体也没有使用hystrix，但是显示的把他打开了，导致了此问题。

导致此问题的代码逻辑如下：服务之间的调用采用的feignclient，采用feignclient拦截器获取上游设置到threadlocal中的数据。

@Slf4j
    public class TenantSupportInterceptor implements RequestInterceptor {
    
    
        public void apply(RequestTemplate template) {
            String tenantNo = Optional.ofNullable(LocalHolder.getTenantNo());
            template.header(CommonConstants.TENANT_NO, tenantNo);
        }
    
    }

public final class LocalHolder {
    
        private LocalHolder() {
        }
    
        private static final InheritableThreadLocal<String> TENANT_NO_THREADLOCAL = new InheritableThreadLocal<>();
    
        public static void setTenantNo(String tenantNo) {
            TENANT_NO_THREADLOCAL.set(tenantNo);
        }
    
        public static String getTenantNo() {
            return TENANT_NO_THREADLOCAL.get();
        }
    
        public static void removeTenantNo() {
            TENANT_NO_THREADLOCAL.remove();
        }
    }

具体为什么采用InheritableThreadLocal下文有说明。

但是有时候就拿不到。经过排查，这两边的线程发生了变化，导致取不到值。导致线程发生变化的原因是显示的声明了hystrix为true。

![744513-20190712151156190-623894373.png][]

只需要把这个设置成false就好。

但是如果项目中真真的是用了hystrix呢？

引用一下文档进行说明：

[https://mp.weixin.qq.com/s?\_\_biz=MzIwMDY0Nzk2Mw==&mid=2650319274&idx=1&sn=0a5bf8ef9148ba8562e0e1c58038da98&chksm=8ef5fddeb98274c8a88522c56050b5e5c7f6d510c5345cec795a130d3abd2b53a16513f578ce&scene=21\#wechat\_redirect][https_mp.weixin.qq.com_s_biz_MzIwMDY0Nzk2Mw_mid_2650319274_idx_1_sn_0a5bf8ef9148ba8562e0e1c58038da98_chksm_8ef5fddeb98274c8a88522c56050b5e5c7f6d510c5345cec795a130d3abd2b53a16513f578ce_scene_21_wechat_redirect]

和

[https://cloud.tencent.com/developer/article/1082737][https_cloud.tencent.com_developer_article_1082737]

转载于:https://www.cnblogs.com/baizhanshi/p/11176343.html

[744513-20190712151156190-623894373.png]: /images/20211109/c19378a7379e4b05adee8b7691d65a84.png
[https_mp.weixin.qq.com_s_biz_MzIwMDY0Nzk2Mw_mid_2650319274_idx_1_sn_0a5bf8ef9148ba8562e0e1c58038da98_chksm_8ef5fddeb98274c8a88522c56050b5e5c7f6d510c5345cec795a130d3abd2b53a16513f578ce_scene_21_wechat_redirect]: https://mp.weixin.qq.com/s?__biz=MzIwMDY0Nzk2Mw==&mid=2650319274&idx=1&sn=0a5bf8ef9148ba8562e0e1c58038da98&chksm=8ef5fddeb98274c8a88522c56050b5e5c7f6d510c5345cec795a130d3abd2b53a16513f578ce&scene=21#wechat_redirect
[https_cloud.tencent.com_developer_article_1082737]: https://cloud.tencent.com/developer/article/1082737