{"id":5361,"date":"2021-03-09T10:03:23","date_gmt":"2021-03-09T02:03:23","guid":{"rendered":"https:\/\/nj.transwarp.cn:8180\/?p=5361"},"modified":"2026-03-09T14:55:00","modified_gmt":"2026-03-09T06:55:00","slug":"dn%e9%80%80%e5%bd%b9%e5%8d%a1%e6%ad%bb%e4%b9%8b%e6%9c%ba%e6%9e%b6%e6%84%9f%e7%9f%a5%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/kbwp.transwarp.cn\/?p=5361","title":{"rendered":"dn\u9000\u5f79\u5361\u6b7b\u4e4b\u673a\u67b6\u611f\u77e5\u95ee\u9898"},"content":{"rendered":"

\u6982\u8981\u63cf\u8ff0<\/h3>\n
\n

\u5728HDFS\u96c6\u7fa4\u8fd0\u7ef4\u8fc7\u7a0b\u4e2d\uff0c\u5e38\u4f1a\u78b0\u5230\u56e0\u4e3a\u5b9e\u9645\u4e1a\u52a1\u589e\u957f\u4f4e\u4e8e\u96c6\u7fa4\u521b\u5efa\u65f6\u7684\u9884\u4f30\u89c4\u6a21\uff1b\u96c6\u7fa4\u6570\u636e\u8fc1\u51fa\uff0c\u6570\u636e\u8282\u70b9\u5197\u4f59\u8f83\u591a\uff1b\u8d39\u7528\u63a7\u5236\u7b49\u539f\u56e0\uff0c\u9700\u8981\u5bf9\u96c6\u7fa4\u8fdb\u884c\u7f29\u5bb9\u64cd\u4f5c\u3002Decommission DataNode\u662f\u8be5\u8fc7\u7a0b\u4e2d\u5173\u952e\u7684\u4e00\u6b65\uff0c\u5c31\u662f\u628aDataNode\u4ece\u96c6\u7fa4\u4e2d\u79fb\u9664\u6389\u3002\u90a3\u95ee\u9898\u6765\u4e86\uff0cHDFS\u5728\u8bbe\u8ba1\u65f6\u5c31\u628a\u8bf8\u5982\u673a\u5668\u6545\u969c\u8003\u8651\u8fdb\u53bb\u4e86\uff0c\u80fd\u5426\u76f4\u63a5\u628a\u67d0\u53f0\u8fd0\u884cDatanode\u7684\u673a\u5668\u5173\u6389\u7136\u540e\u62d4\u8d70\u5462\uff1f\u7406\u8bba\u4e0a\u53ef\u884c\u7684\uff0c\u4e0d\u8fc7\u5728\u5b9e\u9645\u7684\u96c6\u7fa4\u4e2d\uff0c\u5982\u679c\u67d0\u4efd\u6570\u636e\u53ea\u6709\u4e00\u4efd\u526f\u672c\u800c\u4e14\u5b83\u5c31\u5728\u8fd9\u4e2a\u673a\u5668\u4e0a\uff0c\u90a3\u4e48\u76f4\u63a5\u5173\u6389\u5e76\u62d4\u8d70\u673a\u5668\u5c31\u4f1a\u9020\u6210\u6570\u636e\u4e22\u5931\u3002<\/p>\n

\u672c\u6587\u4e3b\u8981\u56f4\u7ed5\u5ba2\u6237\u9047\u5230\u7684\u9000\u5f79\u5361\u6b7b\u7684\u95ee\u9898\u8fdb\u884c\u89e3\u91ca\u8bf4\u660e\uff0c\u5e0c\u671b\u5927\u5bb6\u5728\u9047\u5230\u8be5\u7c7b\u95ee\u9898\u65f6\u6709\u4e00\u4e2a\u6392\u67e5\u7684\u601d\u8def\u3002<\/p>\n

\u8be6\u7ec6\u8bf4\u660e<\/h3>\n
\n

\u95ee\u9898\u73b0\u8c61<\/h4>\n

\u5ba2\u6237\u5728manager\u9875\u9762\u64cd\u4f5c\u4e00\u4e2adatanode\u8282\u70b9\u9000\u5f79\u65f6\uff0c\u53d1\u73b0\u8be5dn\u5728Decommision in Progress\u72b6\u6001\u5341\u51e0\u4e2a\u5c0f\u65f6\u4e00\u76f4\u5361\u7740\u4e0d\u52a8\uff0c\u5176\u4ed6datanode\u7684\u65e5\u5fd7\u91cc\u9762\u4e5f\u6ca1\u6709\u518d\u5237Receiving\u548cReceived\u7684\u65e5\u5fd7\u3002\u8fd9\u4ee3\u8868\u7740\u9000\u5f79\u7684\u64cd\u4f5c\u51fa\u73b0\u4e86\u95ee\u9898\uff0c\u9700\u8981\u8fdb\u884c\u6392\u67e5\u3002<\/p>\n

\"file\"<\/p>\n

\"file\"<\/p>\n

\u601d\u8def<\/h4>\n

ANN\u65e5\u5fd7\u4e2d\u4e00\u76f4\u5728\u5237Failed to place enough replicas<\/code>\u7684\u62a5\u9519\uff1a
\n\"file\"<\/p>\n

1\u3001hdfs\u4e0d\u5728safe-mode\uff1b
\n2\u3001dn\u5168\u90e8\u6b63\u5e38\uff1b
\n3\u3001\u78c1\u76d8\u7a7a\u95f4\u5269\u4f59\u91cf\u5145\u8db3\uff0c\u6ca1\u5230reserved\u7684\u9608\u503c\uff1b
\n4\u3001dfs.datanode.handler.count\u4e3a100\uff0cdn\u65e5\u5fd7\u4e5f\u6ca1\u6709\u62a5\u9519\uff1b
\n5\u3001\u63d0\u9ad8\u9000\u5f79\u901f\u5ea6\u7684\u53c2\u6570\u8bbe\u7f6e<\/p>\n

dfs.namenode.replication.max-streams\ndfs.namenode.replication.max-streams-hard-limit\ndfs.namenode.replication.work.multiplier.per.iteration<\/code><\/pre>\n
\u4e0a\u8ff0\u68c0\u67e5\u90fd\u89e3\u51b3\u4e0d\u4e86\u95ee\u9898\u3002<\/p>\n
\u7136\u540e\u6267\u884chdfs fsck \/ > fsck.log<\/code>\u547d\u4ee4\u8f93\u51fafsck\u65e5\u5fd7\u53d1\u73b0\uff0c\u65e5\u5fd7\u4e2d\u5168\u662fReplica placement policy is violated for BP-239243576-10.129.139.120-1576050513780:blk_1088800851_15060386. Block should be additionally replicated on 1 more rack(s).<\/code> \u7684\u62a5\u9519\uff0c\u5927\u6982\u77e5\u9053\u4e86\u95ee\u9898\u6240\u5728\uff1a<\/p>\n
\u5982\u679c\u5728\u505c\u7528\u4e4b\u524dDataNodes\u9a7b\u7559\u5728\u4e00\u4e2a\u4ee5\u4e0a\u7684\u673a\u67b6\u4e2d\uff0c\u4f46\u4e4b\u540e\u4ec5\u5269\u4e00\u4e2a\u673a\u67b6\uff0c\u5219\u505c\u7528\u5931\u8d25\uff0c\u56e0\u4e3a\u65e0\u6cd5\u5c06\u526f\u672c\u8fc1\u79fb\u5230\u76f8\u540c\u7684\u673a\u67b6\u3002<\/strong><\/p>\n
\u5f53\u524d\u9000\u5f79\u7684DN\u786e\u5b9e\u662f\u5355\u72ec\u5728rack2\u673a\u67b6\u4e0a\u7684\u4e00\u4e2a\u8282\u70b9\uff0c<\/p>\n
\"file\"<\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h4>\n
\n
\u53ef\u4ee5\u901a\u8fc7\u5173\u95ed\u673a\u67b6\u611f\u77e5\uff0c\u6216\u8005\u4fee\u6539\u611f\u77e5\u811a\u672c\u8fd4\u56de\u540c\u4e00\u4e2a\u673a\u67b6\u6765\u89e3\u51b3<\/p>\n
\u65b9\u6848\u4e00\uff1a\u5173\u95ed\u673a\u67b6\u611f\u77e5<\/h5>\n
\u53c2\u8003 HDFS \u5173\u95ed\u6216\u6253\u5f00\u673a\u67b6\u611f\u77e5\u65b9\u6848\u53c2\u8003<\/a><\/p>\n
\u65b9\u6848\u4e8c\uff1a\u4fee\u6539\u811a\u672c<\/h5>\n
TDH\u4e2dhdfs\u7684\u673a\u67b6\u611f\u77e5\u662f\u901a\u8fc7\u5982\u4e0b\u7684\u4e24\u4e2a\u53c2\u6570\u914d\u7f6e\u51b3\u5b9a\u7684\uff0c<\/p>\n
\n    net.topology.node.switch.mapping.impl<\/name>\n    org.apache.hadoop.net.ScriptBasedMapping<\/value>\n<\/property>\n\n    net.topology.script.file.name<\/name>\n    \/usr\/lib\/transwarp\/scripts\/rack_map.sh<\/value>\n<\/property><\/code><\/pre>\n
\u5c06\/usr\/lib\/transwarp\/scripts\/rack_map.sh<\/code>\u4fee\u6539\u5176\u4e2d\u7684result\uff0c\u5199\u6b7b\u8fd9\u4e2arack\u540d\u79f0\uff0c\u65e0\u8bba\u54ea\u4e2a hostname \u90fd\u53cd\u56de\u8fd9\u4e2a rack<\/p>\n
\"file\"<\/p>\n
\u8be5\u811a\u672c\u7684\u539f\u7406\u662f\uff1a<\/strong>
\n\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\uff0c\u8f93\u51fa\u4e00\u4e2a\u503c\u3002\u63a5\u53d7\u7684\u53c2\u6570\u901a\u5e38\u4e3a\u67d0\u53f0datanode\u673a\u5668\u7684ip\u5730\u5740\uff0c\u800c\u8f93\u51fa\u7684\u503c\u901a\u5e38\u4e3a\u8be5ip\u5730\u5740\u5bf9\u5e94\u7684datanode\u6240\u5728\u7684rack\uff0c\u4f8b\u5982\u201d\/rack1\u201d\u3002Namenode\u542f\u52a8\u65f6\uff0c\u4f1a\u5224\u65ad\u8be5\u914d\u7f6e\u9009\u9879\u662f\u5426\u4e3a\u7a7a\uff0c\u5982\u679c\u975e\u7a7a\uff0c\u5219\u8868\u793a\u5df2\u7ecf\u542f\u7528\u673a\u67b6\u611f\u77e5\u7684\u914d\u7f6e\uff0c\u6b64\u65f6namenode\u4f1a\u6839\u636e\u914d\u7f6e\u5bfb\u627e\u8be5\u811a\u672c\uff0c\u5e76\u5728\u63a5\u6536\u5230\u6bcf\u4e00\u4e2adatanode\u7684heartbeat\u65f6\uff0c\u5c06\u8be5datanode\u7684ip\u5730\u5740\u4f5c\u4e3a\u53c2\u6570\u4f20\u7ed9\u8be5\u811a\u672c\u8fd0\u884c\uff0c\u5e76\u5c06\u5f97\u5230\u7684\u8f93\u51fa\u4f5c\u4e3a\u8be5datanode\u6240\u5c5e\u7684\u673a\u67b6ID\uff0c\u4fdd\u5b58\u5230\u5185\u5b58\u7684\u4e00\u4e2amap\u4e2d.<\/p>\n
\u4e0b\u9762\u662f\u5177\u4f53\u7684\u89e3\u51b3\u6b65\u9aa4\uff1a<\/strong>
\n1\u3001\u5bb9\u5668\u5185\u64cd\u4f5c\uff0c\u5148\u5907\u4efd\u8fd9\u4e2a\u811a\u672c\/usr\/lib\/transwarp\/scripts\/rack_map.sh<\/code>\uff0c\u6bd4\u5982 rack_map.sh.tmp<\/code>\uff1b
\n2\u3001\u4fee\u6539\u8be5\u811a\u672c\uff0c\u5199\u6b7brack\u540d\u79f0\uff0c\u5168\u90e8\u8fd4\u56derack1\uff0c \u7136\u540e\u505a\u955c\u50cf\u6301\u4e45\u5316\uff1b
\n3\u3001\u91cd\u542f namenode \u89e6\u53d1 nn \u673a\u67b6\u611f\u77e5 (2 \u4e2d\u53ea\u8fd4\u56de\u4f60\u8981\u7684\u673a\u67b6, \u4e0d\u5305\u542b\u4e0d\u9700\u8981\u7684\u673a\u67b6)\uff0c\u91cd\u542f\u7684\u65f6\u5019\u8981\u4fdd\u8bc1\u6ca1\u6709\u4e1a\u52a1\u8fdb\u6765\uff1b
\n4\u3001\u7b49\u91cd\u542f\u5b8c\u6210\u4e86\uff0c \u8fd9\u65f6\u5019 nn \u662f\u4e0d\u77e5\u9053 rack2 \u5b58\u5728\u7684\uff0c\u8fc7\u4e00\u6bb5\u65f6\u95f4 nn \u5c31\u4f1a\u91cd\u65b0 copy \u526f\u672c\uff0c\u4fdd\u8bc1 rack1 \u7684 dn \u8282\u70b9\u4e4b\u95f4\u526f\u672c copy\u3002\u7b49\u526f\u672c\u90fd\u540c\u6b65\u5b8c\u4e86\uff0c \u5c31\u53ef\u4ee5\u4e0b\u6389 rack2 \u4e86\uff1b
\n5\u3001\u628a\u8fd9\u4e2a\u811a\u672c\u4fee\u6539\u56de\u53bb\uff0c\u7136\u540e\u955c\u50cf\u6301\u4e45\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6982\u8981\u63cf\u8ff0 \u5728HDFS\u96c6\u7fa4\u8fd0\u7ef4\u8fc7\u7a0b\u4e2d\uff0c\u5e38\u4f1a\u78b0\u5230\u56e0\u4e3a\u5b9e\u9645\u4e1a\u52a1\u589e\u957f\u4f4e\u4e8e\u96c6\u7fa4\u521b\u5efa\u65f6\u7684\u9884\u4f30\u89c4\u6a21\uff1b\u96c6\u7fa4\u6570\u636e\u8fc1\u51fa\uff0c\u6570\u636e\u8282\u70b9\u5197 ..<\/p>\n
<\/div>\n
Read more<\/a><\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50],"tags":[],"class_list":["post-5361","post","type-post","status-publish","format-standard","hentry","category-troubleshotting"],"acf":[],"_links":{"self":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/5361","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5361"}],"version-history":[{"count":2,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/5361\/revisions"}],"predecessor-version":[{"id":18082,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/5361\/revisions\/18082"}],"wp:attachment":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5361"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5361"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}