{"id":304070,"date":"2021-01-15T07:20:00","date_gmt":"2021-01-14T23:20:00","guid":{"rendered":"http:\/\/4563.org\/?p=304070"},"modified":"2021-01-15T07:20:00","modified_gmt":"2021-01-14T23:20:00","slug":"%e4%bd%95%e4%b8%ba-java-%e9%ab%98%e6%89%8b%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=304070","title":{"rendered":"\u4f55\u4e3a Java \u9ad8\u624b\uff1f"},"content":{"rendered":"
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\u4f55\u4e3a Java \u9ad8\u624b\uff1f <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : dongguangming <\/span> <\/i> 9<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u770b\u5230\u597d\u591a\u62db\u8058\u7684\uff0c\u8fd9 java \u67b6\u6784\u5e08\u3001\u90a3 java \u4e13\u5bb6\uff0c\u96be\u9053\u90fd\u662f\u641e jvm \u5f00\u53d1\u7684\u5417\uff0c\u672a\u5fc5\u5427 <\/div>\n
\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (2<\/span>) <\/div>\n
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    \n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : young1lin <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u4eba\u5bb6\u53ea\u8981\u4f60\u4e86\u89e3\u57fa\u672c\u7684 JVM \u77e5\u8bc6\uff0c\u5176\u5b9e\u53ea\u662f\u8981\u4f60\u770b\u8fc7\u300a\u6df1\u5165\u7406\u89e3 Java \u865a\u62df\u673a\u300b\u8fd9\u672c\u4e66\u5c31\u591f\u4e86\u3002<\/p>\n

    \u4e00\u822c JVM \u5185\u5b58\u7ed3\u6784\uff08\u8fd9\u90e8\u5206\u4e00\u822c\u662f\u53ef\u4ee5\u770b\u54ea\u91cc\u5bfc\u81f4\u7684 OOM\uff0c\u8fdb\u800c\u77e5\u9053\u5982\u4f55\u89e3\u51b3\uff0c\u6bd4\u5982\u6211\u4e24\u5e74\u524d\u63a5\u624b\u7684\u8001\u9879\u76ee\u7ecf\u5e38\u62a5 PermGen OutOfMemoryError\uff0c\u5c31\u662f\u56e0\u4e3a 1.6\uff0c1.7 \u7248\u672c\u7684 JDK \u6c38\u4e45\u4ee3\u5206\u914d\u7684\u5185\u5b58\u592a\u5c11\u4e86\uff09\uff1b<\/p>\n

    \u4e00\u4e9b\u57fa\u672c\u7684\u542f\u52a8\u53c2\u6570\u8c03\u4f18\uff08\u5173\u95ed\u504f\u5411\u9501\uff0cXms \u548c Xmx \u6839\u636e\u673a\u5668\u5927\u5c0f\uff0c\u8bbe\u7f6e\u6210 60%-75% \u4e4b\u95f4\u7684\u76f8\u7b49\u7684\u503c\uff0c\u907f\u514d\u5927\u91cf\u5185\u5b58\u788e\u7247\u4ea7\u751f\u7b49\u7b49\uff09<\/p>\n

    \u5783\u573e\u56de\u6536\u7b97\u6cd5\uff08\u4ec0\u4e48\u4ee3\u7528\u4ec0\u4e48\u56de\u6536\u7b97\u6cd5\uff0c\u4e3a\u4ec0\u4e48\u8981\u8fd9\u4e48\u7528\u3002\u4f8b\u5982\u5927\u5bf9\u8c61\u76f4\u63a5\u8fdb\u5165\u8001\u5e74\u4ee3\uff0c\u662f\u56e0\u4e3a young \u533a\u91c7\u7528\u7684\u590d\u5236\u6e05\u9664\u7b97\u6cd5\uff09\uff1b<\/p>\n

    \u4ec0\u4e48\u65f6\u5019\u8fdb\u884c\u56de\u6536\uff0c\u662f\u4ec0\u4e48 GC \uff1b<\/p>\n

    \u67e5\u770b dump \u6587\u4ef6\u5206\u6790\u54ea\u6bb5 Java \u7a0b\u5e8f\u5bfc\u81f4\u5185\u5b58\u4e00\u76f4\u5360\u7528\u5f88\u9ad8\u6216\u8005\u9891\u7e41 Full GC \u5bfc\u81f4 CPU \u4f7f\u7528\u7387\u98d9\u5347\uff08\u4e00\u822c\u8fd9\u4e2a\u7528\u5f00\u6e90\u7684\u5de5\u5177\uff09\uff1b<\/p>\n

    \u51e0\u79cd\u5f15\u7528\uff08\u50cf ThreadLocal \u91cc\u9762\u5c31\u7528\u5230\u4e86 WeakReference \uff09\uff1b<\/p>\n

    \u4f1a javap -verbose \u53cd\u7f16\u8bd1\u67e5\u770b\u5177\u4f53 class \u7684\u865a\u62df\u673a\u6307\u4ee4\uff08 invokespecial \u4e4b\u7c7b\u7684\uff09\uff0c\u8fd9\u90e8\u5206\u662f Class \u6587\u4ef6\u7ed3\u6784\u90a3\u90e8\u5206\u7684\uff08\u4e00\u822c\u8fd9\u4e2a\u662f\u7528\u6765\u88c5\u903c\u7684\uff0c\u6216\u8005\u50cf Hikari cp \u4e00\u6837\u8bf4\u6211\u8fd9\u53cd\u7f16\u8bd1\u540e\u90fd\u6bd4\u5176\u4ed6\u7684\u5c11\u4e86\u51e0\u6761\u6307\u4ee4\u5462\uff0c\u8fd8\u4e0d\u9ad8\u6548\uff1f\uff09\uff1b<\/p>\n

    \u4f7f\u7528\u57fa\u672c JDK \u81ea\u5e26\u7684\u5de5\u5177\uff0c\u4f8b\u5982 jstack\uff0cjps\uff0cjconsole\uff0cjmap \u7b49\u7b49\uff08\u6211\u5c31\u7528\u8fc7 jstack + top + ps aux \u7b49\u547d\u4ee4\u627e\u5230\u5177\u4f53\u4f7f CPU \u98d9\u5347\u7684\u5806\u6808\u4fe1\u606f\uff0c\u7136\u540e\u6539\u90a3\u4e2a bug \uff09\uff1b<\/p>\n

    \u53cc\u4eb2\u59d4\u6d3e\u673a\u5236\uff08\u8ba9\u4f60\u77e5\u9053 ClassLoader \u76f8\u5173\u7684\u5185\u5bb9\uff0c\u8fdb\u800c\u77e5\u9053 static \u53d8\u91cf\u5728\u540c\u4e00 ClassLoader \u52a0\u8f7d\u7684\u65f6\u5019\u624d\u662f\u552f\u4e00\u7684\uff0c\u800c\u4e0d\u662f JVM \u8fdb\u7a0b\u5185\u552f\u4e00\uff0c\u540e\u8005\u8bf4\u6cd5\u4e0d\u662f\u7279\u522b\u4e25\u8c28\uff09\uff1b<\/p>\n

    \u7f16\u8bd1\u5230\u6267\u884c\u8fc7\u7a0b\uff08\u4ec0\u4e48\u62bd\u8c61\u8bed\u6cd5\u6811\u554a\uff0c\u6ce8\u89e3\u4ec0\u4e48\u65f6\u5019\u52a0\u8fdb\u6765\u7684\u4e4b\u7c7b\u7684\uff09\uff0c\u8fd8\u6709\u7f16\u8bd1\u5230\u8fd0\u884c\u671f\u95f4\u7684\u5404\u79cd\u4f18\u5316\uff08 String \u7c7b\u578b\u5408\u5e76\uff0c\u9501\u6d88\u9664\uff0c\u9003\u9038\u5206\u6790\u4e4b\u7c7b\u7684\uff09\uff1b<\/p>\n

    \u7406\u89e3\u4e86\u8fd9\u4e9b\uff0c\u5dee\u4e0d\u591a\u4e86\u6211\u89c9\u5f97\uff0c\u6bd4\u5982\u4f60\u5728 debug \u7684\u65f6\u5019\uff0c\u70b9\u90a3\u4e2a drop frame \u5c31\u77e5\u9053\u4ec0\u4e48\u80fd\u8df3\u56de\u4e4b\u524d\u7684\u65b9\u6cd5\u4e86\uff0c\u56e0\u4e3a Java \u7684\u65b9\u6cd5\u8c03\u7528\u5c31\u662f\u538b\u6808\uff08\u865a\u62df\u673a\u6808\uff09\u3002<\/p>\n

    \u5982\u679c\u4f60\u8fd8\u60f3\u4e86\u89e3\u66f4\u591a\uff0c\u770b\u300a Java \u865a\u62df\u673a\u89c4\u8303\u300b\u3002<\/p>\n

    \u5982\u679c\u8fd8\u4e0d\u591f\uff0c\u4f60\u518d\u770b\u770b\u300a\u81ea\u5df1\u52a8\u624b\u5199 Java \u865a\u62df\u673a\u300b\u8fd9\u4e2a\u6765\u88c5\u903c\uff0c\u4f60\u53ef\u4ee5\u6309\u7167\u4e66\u4e0a\u6765\u5199\u4e2a\uff0c\u7136\u540e\u653e\u5230\u4f60\u81ea\u5df1\u7684 Github \u4e0a\uff0c\u548c\u9762\u8bd5\u5b98\u8bf4\uff0c\u8fd9\u662f\u6211\u5199\u7684 Java \u865a\u62df\u673a\uff0c\u5173\u4e8e JVM \u7684\u8fd8\u6709\u4ec0\u4e48\u8981\u95ee\u7684\u5417\uff1f<\/p>\n

    \u540e\u9762\u4e24\u672c\u4e66\uff0c\u8bf4\u5b9e\u8bdd\u6211\u6ca1\u770b\uff0c\u6ca1\u5fc5\u8981\uff0c\u6700\u540e\u7684\u6545\u4e8b\u8f6c\u81ea\u4e00\u4e2a\u7f8e\u56e2\u7684\u9762\u8bd5\u7684\u4eba\u7684\uff0c\u90a3\u4e2a\u7f8e\u56e2\u7684\u4e00\u4e2a\u5c0f\u7ec4\u7ec4\u957f\u8bf4\u770b\u770b\u4eba\u5bb6\uff0c\u81ea\u5df1\u5199\u4e86\u4e2a\u865a\u62df\u673a\uff0c\u771f\u725b\u554a\uff08\u7a83\u559c\uff0c\u8fd9\u672c\u4e66\u6ca1\u4ec0\u4e48\u4eba\u4e86\u89e3\uff09\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
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    \u8cc7\u6df1\u5927\u4f6c : young1lin <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4ec0\u4e48\u67b6\u6784\u5e08\uff0c\u4e13\u5bb6\uff0c\u5176\u5b9e\u8981\u4f1a\u7684\u633a\u591a\u7684\uff0c\u4e0d\u8fc7\u4f60\u4e2d\u95f4\u4ef6\u7684\u5185\u5bb9\u5b66\u7684\u591a\u4e86\u3002\u6216\u8005\u6570\u636e\u5e93\u65b9\u9762\u7684\uff08 MySQL\uff0cRedis\uff0cHive\uff0cHBase \u7b49\u7b49\uff09\u5b66\u591a\u4e86\uff0c\u4f60\u5c31\u4f1a\u53d1\u73b0\uff0c\u5927\u4f53\u4e0a\u7684\u5185\u5bb9\u90fd\u662f\u5dee\u4e0d\u591a\u7684\u3002<\/p>\n

    \u8fd8\u6709\u4ec0\u4e48\u5e38\u7528\u7684\u6846\u67b6\u57fa\u672c\u7684\u5185\u5bb9\u554a\uff0c\u6bd4\u5982 Spring Bean \u7684\u751f\u547d\u5468\u671f\uff0c\u90a3\u4e9b aware \u63a5\u53e3\uff0cpostProcessor \u4e4b\u7c7b\u7684\u89e3\u6790\u6ce8\u89e3\uff0cSpring \u7684\u4e8b\u4ef6\uff0cAOP \uff08\u5176\u5b9e\u5c31\u662f SmartInstation \u8fd9\u4e2a\u5f00\u5934\u7684 postProcessor \u62e6\u622a\uff0c\u7136\u540e\u518d\u8fdb\u884c advisor \u589e\u5f3a\uff09 CGLIB \u63d0\u5347\uff0cIoC \u5bb9\u5668\u662f\u600e\u4e48\u89e3\u8026 Bean \u7684\uff0cSpring Boot \u7684\u81ea\u52a8\u88c5\u914d\u554a\uff0cSpring Cloud \u5b9a\u4e49\u7684\u62bd\u8c61 DiscoveryClient \u4e4b\u7c7b\u7684\u3002<\/p>\n

    \u4f8b\u5982 SQL \u62bd\u8c61\u8bed\u6cd5\u6811\u89e3\u6790\uff0cexplain \u6765\u4f18\u5316 SQL\uff0cWAL \uff08 Write-Ahead-Log == redo\uff0cundo \uff09\uff0c\u5728\u5185\u5b58\u4e0a\u66f4\u65b0\u6570\u636e\uff08 Buffer Pool\uff0cMemStore \uff09\u7136\u540e\u518d\u6839\u636e\u4e00\u5b9a\u89c4\u5219\u5237\u76d8\uff0c\u9ad8\u6548\u5728\u5185\u5b58\u4e0a\u67e5\u8be2\u7684 Buffer Pool\uff0cBlockCache\uff0c\u8fd8\u6709\u600e\u6837\u9ad8\u6548\u6784\u5efa\u4e8c\u7ea7\u7d22\u5f15\uff08\u4e5f\u53ef\u4ee5\u7528 Elasticsearch \u6765\u505a\uff09\uff0c\u589e\u91cf\u8fd8\u662f\u5168\u91cf\u5907\u4efd\uff08 binlog \u7b49\uff09\u7b49\u7b49\u3002<\/p>\n

    **\u67b6\u6784\u5e08\u4e0d\u4e00\u5b9a\u8981\u4ec0\u4e48\u90fd\u7cbe\uff0c\u4f46\u4e00\u5b9a\u8981\u5927\u90e8\u5206\u90fd\u61c2\u4e2a\u5927\u6982\u539f\u7406\uff0c\u6709\u524d\u77bb\u6027**\u3002 <\/p>\n

    \u57fa\u672c\u7684\u5355\u4f53\uff0cSOA\uff0c\u5fae\u670d\u52a1\u6f14\u8fdb\u3002\u516d\u8fb9\u5f62\u67b6\u6784\uff0c\u6574\u6d01\u67b6\u6784\uff08\u53c8\u540d\u6d0b\u8471\u67b6\u6784\uff09\uff0cCAP\uff0cBASE \u7b49\u7b49\u57fa\u672c\u7684\u7406\u8bba\u77e5\u8bc6\uff0c\u8fd8\u6709 FEMA \u65b9\u6cd5\u3002\u4e3b\u4ece\uff0c\u4e3b\u5907\uff0c\u96c6\u7fa4\u3002Cluster\uff0cShard\uff0cPartition\uff0cRegion \u7b49\u7b49\u8fd9\u4e9b\u540d\u8bcd\u3002TPC \u3001PPC \u3001Reactor \u3001Proactor \u8fd9\u4e9b\u3002MVC \u3001MVP \u67b6\u6784\uff0c\u4e03\u79cd\u8d1f\u8f7d\u5747\u8861\u7b56\u7565\u3002\u5f02\u5730\u591a\u6d3b\uff0cServerless \uff08\u8fd9\u4e2a\u662f\u4e0b\u4e00\u4ee3\u5f00\u53d1\u7684\u65b9\u5411\uff09\uff0cCloud Foundry \u5e73\u53f0\u4e4b\u7c7b\u8981\u61c2\u3002\u4e91\u539f\u751f\u7a0b\u5e8f\u7684\u5341\u4e8c\u8981\u7d20\uff0c\u5fae\u670d\u52a1\u7684\u5341\u4e00\u8981\u70b9\uff08\u670d\u52a1\u53d1\u73b0\uff0c\u8def\u7531\uff0c\u5bb9\u9519\u7b49\u7b49\uff09\u3002\u8fdb\u7a0b\u5185\u4e0e\u8fdb\u7a0b\u95f4\u7684\u5171 6 \u79cd\u89e3\u8026\u65b9\u5f0f\u3002\u5fae\u670d\u52a1\u7684\u4e24\u79cd\u5e38\u89c1\u62c6\u5206\u65b9\u5f0f\uff0c\u6839\u636e\u670d\u52a1\u62c6\u5206\uff0c\u6839\u636e DDD \u6765\u62c6\u5206\u3002DDD \u53c8\u6709\u4ec0\u4e48\u5b50\u57df\uff0c\u6838\u5fc3\u57df\uff0c\u901a\u7528\u57df\uff0c\u652f\u6491\u57df\uff0c\u9650\u754c\u4e0a\u4e0b\u6587\uff0c\u805a\u5408\uff0c\u805a\u5408\u6839\uff0c\u5b9e\u4f53\uff0c\u503c\u5bf9\u8c61\uff0c\u9886\u57df\u4e8b\u4ef6\u7b49\u7b49\u3002<\/p>\n

    \u8ba1\u7b97\u673a\u539f\u7406\u4e4b\u7c7b\u7684\uff0c\u867d\u7136\u8fd9\u4e2a\u5728\u5927\u5b66\u91cc\u5c31\u5b66\u8fc7\u4e86\uff0cCPU \u65f6\u95f4\u7247\uff0c\u8fdb\u7a0b\u6302\u8d77\uff0c\u4e0a\u4e0b\u6587\u5207\u6362\uff0c\u7ba1\u7a0b\u7b49\u7b49\uff0c\u4f46\u662f\u5f53\u65f6\u8c01\u61c2\u554a\uff0c\u8fd8\u6709\u4ec0\u4e48 CPU \u539f\u7406\uff0c\u5bc4\u5b58\u5668\uff0c\u5954\u817e 8086\uff0c\u60f3\u5230\u5c31\u5934\u5927\u3002\u8fd8\u6709\u7f51\u7edc\u57fa\u7840\u4ec0\u4e48\u7684\uff0c\u57fa\u672c Web \u5b89\u5168\u5f00\u542f\u3002<\/p>\n

    \u5176\u5b9e\u8fd8\u6709\u7b97\u6cd5\u65b9\u9762\u7684\uff0c\u6ca1\u529e\u6cd5\uff0c\u6709\u4e9b\u516c\u53f8\uff08\u6bd4\u5982\u5b57\u8282\uff09\u8981\u4f60\u5237\u5230 LeetCode medium\uff0c\u6765\u8003\u5bdf\u4f60\u662f\u4e0d\u662f\u201c\u8111\u5b50\u7075\u6d3b\u201d\u3002\u5176\u5b9e\u4e5f\u6709\u4e00\u5b9a\u7528\u5904\uff0c\u6bd4\u5982\u5feb\u6392\u5728 MySQL \u4e2d\u5c31\u6709\u4f53\u73b0\uff0c\u8d85\u8fc7\u4e00\u5b9a\u91cf\u7ea7\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u5c31\u7528\u5feb\u6392\u3002\u8fd8\u6709\u9650\u6d41\u7b97\u6cd5\uff0c\u6ed1\u52a8\u7a97\u53e3\u4e4b\u7c7b\u7684\uff0c\u4e0d\u8fc7\u8fd9\u4e9b\u90fd\u7531\u6846\u67b6\u5e2e\u4f60\u641e\u5b9a\u4e86\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

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