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Linux服务自动掉线问题排查,都是僵尸惹的祸(2)

  • 2026-08-18 23:11:43
Linux服务自动掉线问题排查,都是僵尸惹的祸(2)

点击上方“只会写BUG的程序猿”,选择“设为星标

 接着上文.我们继续排查调研一下.服务自动掉线的问题.上文中我们已经排查了服务器进程不足.僵尸进程占用过重.但是kill僵尸进程后.还是会产生僵尸进程和服务掉线.

01

内存

核心问题:物理内存耗尽

最突出、最紧急的问题是内存使用情况:

  • 总内存:30932.4 MiB(约30.9 GB)

  • 已用内存:28177.6 MiB(约28.2 GB)—— 使用率高达 91.1%

  • 可用内存avail Mem):只有 2253.5 MiB(约2.2 GB)

  • 空闲内存free):仅剩 291.6 MiB(约0.3 GB)

内存压力很大.而且Java服务在内存做计算等时,就会导致Out-Of-Memory (OOM) Killer 被触发,就会kill服务.

02

内存消耗大户

大部分 Java 服务 CPU 占用率较低(0.X%),内存占用(%MEM)在 3.3% 到 11.5% 之间,这取决于具体的业务负载和 JVM 内存设置。

由此我们可以看出.Java服务中使用了大量的内存处理操作:

03

Java服务内存消耗大户

  • 查 (Query/Read):

    • 表现:根据 ID 查询单条、分页查询。

    • 内存影响中低。只要分页参数合理(每页 10~100 条),内存消耗可控。

    • 风险点:如果业务代码写成了“全表查询到内存中再过滤”(例如 select * from table 不加限制),或者分页深度过大(如 offset 1000000),会导致大量数据被加载到堆内存中(List/Map),造成 Young GC 频繁。

  • 数据导出 (Export)

    • 全量查询:通常导出需要查询大量数据(几万甚至几十万条记录)。

    • 对象持久化:查出来的每一条数据都要被映射成 Java 对象(POJO/Entity)。如果一次性将 10 万条记录查出来放到一个 List 里,这 10 万个对象瞬间就会把 Java 堆内存 (Heap) 撑爆。

    • Excel/CSV 构建:如果使用 Apache POI 的 SXSSFWorkbook (普通模式) 或 EasyExcel 的非流式模式,导出的整个 Excel 表格对象也会全部驻留在内存中,这是双重暴击。

  • 数据导入 (Import):

    • 前端上传文件:文件先转换成 MultipartFile 流,如果不做限制,几十 MB 的 Excel 文件可能直接被读入内存。

    • 解析数据:读取 Excel 时,若直接解析整个文件并转换为巨大的 Java 对象 List 进行业务校验,会极大消耗内存。

    • 批量插入:为了效率,程序通常使用 insert batch。但如果在内存中拼装了超大的 SQL 预编译参数数组,也会占用内存。

    • 文件上传 (File Upload):

      • 如果您直接使用 MultipartFile.getBytes() 把整个文件读到 byte[] 数组里

      • 上传 100MB 的视频,内存里立刻多出 100MB 的 byte[]

        Java 的 byte[] 分配和回收非常消耗时间,极易引发 Full GC,导致服务停顿。

      • 如果您直接使用 MultipartFile.getBytes() 把整个文件读到 byte[] 数组里:

      • 如果需要把文件转存到 OSS 对象存储(阿里云 OSS),标准做法是上传 InputStream。

    • 未关闭的 IO 流
        读取 InputStream 后忘记 close(),导致堆外内存 (Direct Buffer) 耗尽
    • 内存泄漏

       使用了 ThreadLocal 但未清理,导致长生命周期线程关联了大对象无法被 GC

    • Websocket
    • 原理:每一个 WebSocket 客户端连接,服务器端都需要维护一个对应的 Session 对象(或 Channel 对象)。

    • 内存占用:单个连接的对象开销不大(通常几十到几百字节),但连接数一旦变大,这个消耗就会线性增长

    04

    总结

    以上这些都是内存占用大户,具体还有哪些,大家可以在评论区补充.

    拈㕦一笑的CSDN

    https://blog.csdn.net/u013432938?type=blog

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    1. CONNECT:[ UseTime:0.000960s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001503s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.034486s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007398s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001544s ]
    6. SELECT * FROM `set` [ RunTime:0.000765s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001467s ]
    8. SELECT * FROM `article` WHERE `id` = 508845 LIMIT 1 [ RunTime:0.006724s ]
    9. UPDATE `article` SET `lasttime` = 1787337735 WHERE `id` = 508845 [ RunTime:0.050638s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.013204s ]
    11. SELECT * FROM `article` WHERE `id` < 508845 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001273s ]
    12. SELECT * FROM `article` WHERE `id` > 508845 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005765s ]
    13. SELECT * FROM `article` WHERE `id` < 508845 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014996s ]
    14. SELECT * FROM `article` WHERE `id` < 508845 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.052811s ]
    15. SELECT * FROM `article` WHERE `id` < 508845 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.056924s ]
    0.426464s