阿里巴巴 arthas教程3

我会带着你远行 2024-04-18 08:09 75阅读 0赞

#### 本文介绍：watch的使用 ####

### 7.watch命令 ###

watch命令，在排查复线线上问题时非常有效。

#### 1. 监控com.runlion.fsp.credit.service.impl.CreditServiceImpl 类的listCreditAndUserOnCondition方法返回值，及方法耗时： ####

$ watch com.runlion.fsp.credit.service.impl.CreditServiceImpl listCreditAndUserOnCondition returnObj

然后就会阻塞状态，线上排查问题时，这时就可以去重新触发此方法，查看返回值信息

$ watch com.runlion.fsp.credit.service.impl.CreditServiceImpl listCreditAndUserOnCondition returnObj 
    Press Q or Ctrl+C to abort.
    Affect(class-cnt:2 , method-cnt:2) cost in 203 ms.
    ts=2019-09-03 19:14:48; [cost=364.531509ms] result=@FspPageInfo[
        pageNum=@Integer[1],
        pageSize=@Integer[20],
        total=@Long[234],
        pages=@Integer[12],
        result=@Page[isEmpty=false;size=20],
    ]
    ts=2019-09-03 19:14:48; [cost=403.969714ms] result=@FspPageInfo[
        pageNum=@Integer[1],
        pageSize=@Integer[20],
        total=@Long[234],
        pages=@Integer[12],
        result=@Page[isEmpty=false;size=20],
    ]

显然，整个结果我们并不满意，我们想看人能读懂的数据。

watch有多个参数：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9pdDRhbGwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70]

#### 2. 我们注意最后一个，指定属性遍历深度，刚才的遍历深度没有指定，默认为1，所以没有具体到数据，我们设置为3看一下： ####

$ watch com.runlion.fsp.credit.service.impl.CreditServiceImpl listCreditAndUserOnCondition returnObj -x 3

$ watch com.runlion.fsp.credit.service.impl.CreditServiceImpl listCreditAndUserOnCondition returnObj -x 3
    Press Q or Ctrl+C to abort.
    Affect(class-cnt:2 , method-cnt:2) cost in 205 ms.
    ts=2019-09-03 19:21:37; [cost=419.18139ms] result=@FspPageInfo[
        pageNum=@Integer[1],
        pageSize=@Integer[20],
        total=@Long[234],
        pages=@Integer[12],
        result=@Page[
            @CreditDetailVo[
                creditId=@String[CRED19090300001871],
                userName=@String[15995055310],
                realName=@String[溧阳市神马机电设备安装有限公司],
                phone=@String[15995055310],
                userProp=@Integer[1],
                userPropStr=@String[供应商],
                userType=@Integer[1],
                userTypeStr=@String[企业],
                productId=@String[LPRO19080800000001],
                productName=@String[自助贷],
                relatedCompanyName=@String[漳平红狮水泥有限公司],
                moneyResourceOrganizationName=null,
                creditTotal=@BigDecimal[46800.00],
                creditUsed=@BigDecimal[0.00],
                creditResidue=@BigDecimal[42545.45],
                deleted=@Integer[0],
                deletedStr=@String[正常],
                gmtCreate=@Date[2019-09-03 16:56:41,000],
                channelUserName=@String[20500030],
            ],
            @CreditDetailVo[
                creditId=@String[CRED19090300001872],
                userName=@String[15995055310],
                realName=@String[溧阳市神马机电设备安装有限公司],
                phone=@String[15995055310],
                userProp=@Integer[1],
                userPropStr=@String[供应商],
                userType=@Integer[1],
                userTypeStr=@String[企业],
                productId=@String[LPRO19080800000002],
                productName=@String[应收账款质押贷],
                relatedCompanyName=@String[漳平红狮水泥有限公司],
                moneyResourceOrganizationName=null,
                creditTotal=@BigDecimal[46800.00],
                creditUsed=@BigDecimal[0.00],
                creditResidue=@BigDecimal[42545.45],
                deleted=@Integer[0],
                deletedStr=@String[正常],
                gmtCreate=@Date[2019-09-03 16:56:41,000],
                channelUserName=@String[20500030],
            ],

#### 3. 我们同时监控入参和出参： ####

页面请求时设置startTimeF和endTimeF两个参数，然后监控结果：

$ watch com.runlion.fsp.credit.service.impl.CreditServiceImpl listCreditAndUserOnCondition "{params,returnObj}" -x 3

$ watch com.runlion.fsp.credit.service.impl.CreditServiceImpl listCreditAndUserOnCondition "{params,returnObj}" -x 3
    Press Q or Ctrl+C to abort.
    Affect(class-cnt:2 , method-cnt:2) cost in 183 ms.
    ts=2019-09-03 19:29:58; [cost=336.416578ms] result=@ArrayList[
        @Object[][
            @CreditDto[
                creditId=null,
                realName=null,
                phone=null,
                relatedCompanyName=null,
                productId=null,
                deleted=null,
                startTimeF=@Date[2019-08-01 00:00:00,000],
                endTimeF=@Date[2019-09-30 23:59:59,000],
                pageNum=@Integer[1],
                pageSize=@Integer[20],
            ],
        ],
        @FspPageInfo[
            pageNum=@Integer[1],
            pageSize=@Integer[20],
            total=@Long[58],
            pages=@Integer[3],
            result=@Page[
                @CreditDetailVo[CreditDetailVo(creditId=CRED19090300001872, userName=15995055310, realName=溧阳市神马机电设备安装有限公司, phone=15995055310, userProp=1, userPropStr=供应商, userType=1, userTypeStr=企业, productId=LPRO19080800000002, productName=应收账款质押贷, relatedCompanyName=漳平红狮水泥有限公司, moneyResourceOrganizationName=null, creditTotal=46800.00, creditUsed=0.00, creditResidue=42545.45, deleted=0, deletedStr=正常, gmtCreate=Tue Sep 03 16:56:41 CST 2019, channelUserName=20500030)],
                @CreditDetailVo[CreditDetailVo(creditId=CRED19090300001871, userName=15995055310, realName=溧阳市神马机电设备安装有限公司, phone=15995055310, userProp=1, userPropStr=供应商, userType=1, userTypeStr=企业, productId=LPRO19080800000001, productName=自助贷, relatedCompanyName=漳平红狮水泥有限公司, moneyResourceOrganizationName=null, creditTotal=46800.00, creditUsed=0.00, creditResidue=42545.45, deleted=0, deletedStr=正常, gmtCreate=Tue Sep 03 16:56:41 CST 2019, channelUserName=20500030)]

#### 4. 观察当前对象中的属性 ####

$ watch com.runlion.fsp.credit.service.impl.CreditServiceImpl listCreditAndUserOnCondition "target" -x 3
    Press Q or Ctrl+C to abort.
    Affect(class-cnt:2 , method-cnt:2) cost in 189 ms.
    ts=2019-09-03 19:34:52; [cost=313.479341ms] result=@CreditServiceImpl[
        log=@Logger[
            serialVersionUID=@Long[5454405123156820674],
            FQCN=@String[ch.qos.logback.classic.Logger],
            name=@String[com.runlion.fsp.credit.service.impl.CreditServiceImpl],
            level=null,
            effectiveLevelInt=@Integer[20000],
            parent=@Logger[
                serialVersionUID=@Long[5454405123156820674],
                FQCN=@String[ch.qos.logback.classic.Logger],
                name=@String[com.runlion.fsp.credit.service.impl],
                level=null,
                effectiveLevelInt=@Integer[20000],
                parent=@Logger[Logger[com.runlion.fsp.credit.service]],
                childrenList=@CopyOnWriteArrayList[isEmpty=false;size=5],
                aai=null,
                additive=@Boolean[true],
                loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]],
            ],
            childrenList=null,
            aai=null,
            additive=@Boolean[true],

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9pdDRhbGwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 1]  
更具体的watch使用信息，可参考：https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/watch.md

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9pdDRhbGwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/b45442d6ca0c43078dcd7394f77fb1dd.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9pdDRhbGwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/72042586b5b347e59e044cd06d7b2512.png