\u6211\u4eec\u6709\u4e00\u4e2aHadoop\u96c6\u7fa4\u4ece\u4e0a\u4e2a\u6708\u5f00\u59cb\u9047\u5230\u4e00\u7cfb\u5217\u6027\u80fd\u95ee\u9898\uff0c\u5728\u9010\u4e00\u89e3\u51b3\u7684\u8fc7\u7a0b\u4e2d\uff0c\u79ef\u7d2f\u4e86\u4ee5\u4e0b\u7684\u4f18\u5316\u7ecf\u9a8c\u3002<\/p>\n
1. \u7f51\u7edc\u5e26\u5bbd<\/p>\n
Hadoop\u96c6\u7fa4\u7684\u670d\u52a1\u5668\u5728\u89c4\u5212\u65f6\u5c31\u5728\u7edf\u4e00\u7684\u4ea4\u6362\u673a\u4e0b\uff0c\u8fd9\u662f\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u5efa\u8bae\u7684\u90e8\u7f72\u65b9\u5f0f\u3002<\/p>\n
\u4f46\u662f\u6211\u4eec\u7684\u8fd9\u53f0\u4ea4\u6362\u673a\u548c\u5176\u4ed6\u4ea4\u6362\u673a\u7684\u4e92\u8054\u5e26\u5bbd\u6709\u9650\uff0c\u6240\u4ee5\u5728\u5ba2\u6237\u7aef\u9047\u5230\u4e86HDFS\u8bbf\u95ee\u901f\u5ea6\u6162\u7684\u95ee\u9898\u3002<\/p>\n
\u628a\u64cd\u4f5c\u96c6\u7fa4\u7684\u5ba2\u6237\u7aef\u4e5f\u8054\u5165DataNode\u7684\u4ea4\u6362\u673a\u5185\u90e8\uff0c\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n
2. \u7cfb\u7edf\u53c2\u6570<\/p>\n
\u5bf9ulimit -c\u7684\u4fee\u6539\u4e5f\u662f\u5b98\u65b9\u6587\u6863\u5efa\u8bae\u7684\u4fee\u6539\uff0c\u5728\u96c6\u7fa4\u53ea\u670910\u53f0\u670d\u52a1\u5668\u65f6\uff0c\u5e76\u6ca1\u6709\u9047\u5230\u95ee\u9898\u3002<\/p>\n
\u968f\u7740\u673a\u5668\u589e\u52a0\u548c\u4efb\u52a1\u589e\u52a0\uff0c\u8fd9\u4e2a\u503c\u9700\u8981\u6539\u7684\u66f4\u5927\u3002<\/p>\n
3. \u914d\u7f6e\u6587\u4ef6\u7ba1\u7406<\/p>\n
\u8fd9\u4e2a\u96c6\u7fa4\u7528\u7684\u662fCloudera\u53d1\u884c\u7684\u7248\u672c\uff0c\u914d\u7f6e\u6587\u4ef6\u9ed8\u8ba4\u5b58\u5728\/etc\/hadoop\/conf\u4f4d\u7f6e\u3002\u8fd9\u662f\u4e00\u4e2a\u53ea\u6709root\u624d\u80fd\u4fee\u6539\u7684\u4f4d\u7f6e\u3002<\/p>\n
\u4e3a\u4e86\u4fee\u6539\u65b9\u4fbf\uff0c\u6211\u628a\u914d\u7f6e\u6587\u4ef6\u7edf\u4e00\u4fdd\u5b58\u5728\u4e00\u53f0\u673a\u5668\u4e0a\uff0c\u4fee\u6539\u540e\u7528\u811a\u672c\u5206\u53d1\u3002\u4fdd\u8bc1\u6240\u6709\u670d\u52a1\u5668\u90fd\u662f\u7edf\u4e00\u7684\u914d\u7f6e\u3002<\/p>\n
4. mapred.tasktracker.map.tasks.maximum<\/p>\n
\u8fd9\u4e2a\u53c2\u6570\u63a7\u5236\u6bcf\u4e2aTaskTracker\u540c\u65f6\u8fd0\u884c\u7684Map\u4efb\u52a1\u6570\u3002<\/p>\n
\u4ee5\u524d\u7684\u8bbe\u7f6e\u662f\u548cCPU\u6838\u6570\u76f8\u540c\u7684\uff0c\u5076\u5c14\u9047\u5230\u4efb\u52a1\u6324\u5360DataNode\u8d44\u6e90\u7684\u95ee\u9898\u3002<\/p>\n
\u73b0\u5728\u6539\u6210map+reduce+1==num_cpu_cores\u3002<\/p>\n
5. \u4e25\u683c\u63a7\u5236root\u6743\u9650<\/p>\n
Cloudera\u7684\u53d1\u884c\u7248\u4f1a\u521b\u5efa\u4e00\u4e2ahadoop\u7528\u6237\uff0c\u5404\u79cd\u5b88\u62a4\u8fdb\u7a0b\u90fd\u5e94\u8be5\u4ee5\u8fd9\u4e2a\u7528\u6237\u8fd0\u884c\u3002<\/p>\n
\u66fe\u7ecf\u6709\u8bef\u64cd\u4f5c\uff08\/usr\/lib\/hadoop\/bin\/hadoop datanode &\uff09\u5bfc\u81f4\u672c\u5730\u7684\u6570\u636e\u76ee\u5f55\u88abroot\u5199\u5165\u65b0\u6587\u4ef6\uff0c\u4e8e\u662f\u6b63\u786e\u542f\u52a8\u7684hadoop\u7528\u6237\u8fdb\u7a0b\u65e0\u6cd5\u8bfb\u5199\u3002<\/p>\n
\u6240\u4ee5\u73b0\u5728\u7684\u96c6\u7fa4\u670d\u52a1\u5668\u4e0d\u63d0\u4f9b\u65e5\u5e38\u7684root\u6743\u9650\u8bbf\u95ee\u3002<\/p>\n
6. Java\u7684GC\u6a21\u5f0f<\/p>\n
\u5728mapred.child.java.opts\u548cHADOOP_OPTS\u90fd\u589e\u52a0\u4e86-XX:+UseConcMarkSweepGC\u3002<\/p>\n
JDK\u7684\u6587\u6863\u4e2d\u63a8\u8350\u73b0\u4ee3\u591a\u6838\u5904\u7406\u5668\u7cfb\u7edf\uff0c\u91c7\u7528\u8fd9\u79cdGC\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5145\u5206\u5229\u7528CPU\u7684\u5e76\u53d1\u80fd\u529b\u3002<\/p>\n
\u8fd9\u4e2a\u6539\u52a8\u5bf9\u6027\u80fd\u7684\u79ef\u6781\u5f71\u54cd\u5f88\u5927\u3002<\/p>\n
7. \u9009\u62e9\u6b63\u786e\u7684JDK<\/p>\n
\u8fd9\u4e2a\u96c6\u7fa4\u6709\u90e8\u5206\u670d\u52a1\u5668\u7684JDK\u7528\u7684\u662f32\u4f4d\u7248\u672c\uff0c\u4e0d\u80fd\u521b\u5efa-Xmx4g\u4ee5\u4e0a\u7684\u8fdb\u7a0b\u3002<\/p>\n
\u7edf\u4e00\u4e3ax64\u7248\u672c\u7684JDK\u3002<\/p>\n
8. mapred.reduce.slowstart.completed.maps<\/p>\n
\u8fd9\u4e2a\u53c2\u6570\u63a7\u5236slowstart\u7279\u6027\u7684\u65f6\u673a\uff0c\u9ed8\u8ba4\u662f\u57285%\u7684map\u4efb\u52a1\u5b8c\u6210\u540e\uff0c\u5c31\u5f00\u59cb\u8c03\u5ea6reduce\u8fdb\u7a0b\u542f\u52a8\uff0c\u5f00\u59cbcopy\u8fc7\u7a0b\u3002<\/p>\n
\u4f46\u662f\u6211\u4eec\u7684\u673a\u5668\u6570\u91cf\u4e0d\u591a\uff0c\u6709\u4e00\u6b21\u5927\u91cf\u7684\u4efb\u52a1\u5806\u79ef\u5728JobTracker\u91cc\uff0c\u6bcf\u4e2aTaskTracker\u7684map\u548creduce slots\u90fd\u8dd1\u6ee1\u4e86\u3002<\/p>\n
\u7531\u4e8emap\u6ca1\u6709\u8db3\u591f\u8d44\u6e90\u8fc5\u901f\u5b8c\u6210\uff0creduce\u4e5f\u5c31\u65e0\u6cd5\u7ed3\u675f\uff0c\u9020\u6210\u96c6\u7fa4\u7684\u8d44\u6e90\u4e92\u76f8\u6b7b\u9501\u3002<\/p>\n
\u628a\u8fd9\u4e2a\u53c2\u6570\u6539\u6210\u4e860.75\uff0c\u4efb\u52a1\u5806\u79ef\u7684\u5217\u8868\u4ece\u5e73\u574710\u4e2a\uff0c\u53d8\u6210\u4e863\u4e2a\u3002<\/p>\n
9. mapred.fairscheduler.preemption<\/p>\n
\u8fd9\u4e2a\u53c2\u6570\u8bbe\u4e3a\u4e86true\u3002\u4ee5\u4fbffairscheduler\u5728\u7528\u6237\u6700\u5c0f\u8d44\u6e90\u4e0d\u80fd\u6ee1\u8db3\u65f6\uff0ckill\u5176\u4ed6\u4eba\u7684\u4efb\u52a1\u817e\u51fa\u8db3\u591f\u7684\u8d44\u6e90\u3002<\/p>\n
\u96c6\u7fa4\u8fd0\u884c\u7740\u5404\u79cd\u7c7b\u578b\u7684\u4efb\u52a1\uff0c\u6709\u4e9bmap\u4efb\u52a1\u9700\u8981\u8fd0\u884c\u6570\u5c0f\u65f6\u3002\u8fd9\u4e2a\u53c2\u6570\u4f1a\u5bfc\u81f4\u8fd9\u7c7b\u4efb\u52a1\u88ab\u9891\u7e41kill\uff0c\u51e0\u4e4e\u65e0\u6cd5\u5b8c\u6210\u3002\u66fe\u7ecf\u6709\u4e2a\u4efb\u52a1\u57287\u5c0f\u65f6\u5185\u88abkill\u4e86137\u6b21\u3002<\/p>\n
\u53ef\u4ee5\u901a\u8fc7\u8c03\u6574fairscheduler\u7684pool\u914d\u7f6e\u89e3\u51b3\uff0c\u7ed9\u8fd9\u79cd\u4efb\u52a1\u5355\u72ec\u914d\u7f6e\u4e00\u4e2aminMap==maxMap\u7684pool\u3002<\/p>\n
10. mapred.jobtracker.completeuserjobs.maximum<\/p>\n
\u9650\u5236\u6bcf\u4e2a\u7528\u6237\u5728JobTracker\u7684\u5185\u5b58\u4e2d\u4fdd\u5b58\u4efb\u52a1\u7684\u4e2a\u6570\u3002<\/p>\n
\u56e0\u4e3a\u8fd9\u4e2a\u53c2\u6570\u8fc7\u5927\uff0c\u6211\u4eec\u7684JobTracker\u542f\u52a8\u4e0d\u523024\u5c0f\u65f6\u5c31\u4f1a\u9677\u5165\u9891\u7e41\u7684FullGC\u5f53\u4e2d\u3002<\/p>\n
\u76ee\u524d\u6539\u4e3a5\uff0cJT\u5e73\u7a33\u8fd0\u884c\u4e00\u5929\u5904\u74061500\u4e2a\u4efb\u52a1\uff0c\u53ea\u5360\u7528800M\u5185\u5b58\u3002<\/p>\n
\u8fd9\u4e2a\u53c2\u6570\u5728>0.21.0\u5df2\u7ecf\u6ca1\u6709\u5fc5\u8981\u8bbe\u7f6e\u4e86\uff0c\u56e0\u4e3a0.21\u7248\u672c\u6539\u9020\u4e86completeuserjobs\u7684\u7528\u6cd5\uff0c\u4f1a\u5c3d\u5feb\u7684\u5199\u5165\u78c1\u76d8\uff0c\u4e0d\u518d\u5185\u5b58\u4e2d\u957f\u671f\u5b58\u5728\u4e86\u3002<\/p>\n
11. mapred.jobtracker.update.faulty.tracker.interval\u548cmapred.jobtracker.max.blacklist.percent<\/p>\n
\u4e00\u4e2a\u5199\u9519\u7684\u4efb\u52a1\uff0c\u4f1a\u5bfc\u81f4\u4e00\u5927\u6279TaskTracker\u8fdb\u5165\u9ed1\u540d\u5355\uff0c\u800c\u4e14\u898124\u5c0f\u65f6\u624d\u80fd\u6062\u590d\u3002\u8fd9\u79cd\u72b6\u51b5\u5bf9\u4e2d\u5c0f\u89c4\u6a21\u7684\u96c6\u7fa4\u6027\u80fd\u5f71\u54cd\u662f\u975e\u5e38\u5927\u7684\u3002\u53ea\u80fd\u901a\u8fc7\u624b\u5de5\u91cd\u542fTaskTracker\u6765\u4fee\u590d\u3002\u6240\u4ee5\u6211\u4eec\u5c31\u4fee\u6539\u4e86\u90e8\u5206JobTracker\u7684\u4ee3\u7801\uff0c\u66b4\u9732\u4e86\u4e24\u4e2a\u53c2\u6570\uff1a<\/p>\n
mapred.jobtracker.update.faulty.tracker.interval\u63a7\u5236\u9ed1\u540d\u5355\u91cd\u7f6e\u65f6\u95f4\uff0c\u9ed8\u8ba4\u662f24\u5c0f\u65f6\u4e0d\u80fd\u6539\u53d8\uff0c\u6211\u4eec\u73b0\u5728\u6539\u6210\u4e861\u5c0f\u65f6\u3002<\/p>\n
mapred.jobtracker.max.blacklist.percent\u63a7\u5236\u8fdb\u5165\u9ed1\u540d\u5355TT\u7684\u6bd4\u4f8b\uff0c\u6211\u4eec\u6539\u6210\u4e860.2\u3002<\/p>\n
\u6211\u6b63\u5728\u8865\u5145\u8fd9\u4e24\u4e2a\u53c2\u6570\u7684TestCase\uff0c\u51c6\u5907\u63d0\u4ea4\u5230trunk\u4e2d\u3002<\/p>\n
12. \u591a\u7528hive\u5c11\u7528streaming<\/p>\n
\u7531\u4e8estreaming\u7684\u65b9\u4fbf\u5feb\u6377\uff0c\u6211\u4eec\u505a\u4e86\u5f88\u591a\u57fa\u4e8e\u5b83\u7684\u5f00\u53d1\u3002\u4f46\u662f\u7531\u4e8estreaming\u7684\u4efb\u52a1\u5728\u8fd0\u884c\u65f6\u8fd8\u8981\u6709\u4e00\u4e2ajava\u8fdb\u7a0b\u8bfb\u5199stdin\/out\uff0c\u6709\u4e00\u5b9a\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n
\u7c7b\u4f3c\u7684\u9700\u6c42\u6700\u597d\u6539\u7528\u81ea\u5b9a\u4e49\u7684Deserializer+hive\u6765\u5b8c\u6210\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6211\u4eec\u6709\u4e00\u4e2aHadoop\u96c6\u7fa4\u4ece\u4e0a\u4e2a\u6708\u5f00\u59cb\u9047\u5230\u4e00\u7cfb\u5217\u6027\u80fd\u95ee\u9898\uff0c\u5728\u9010\u4e00\u89e3\u51b3\u7684\u8fc7\u7a0b\u4e2d\uff0c\u79ef\u7d2f\u4e86\u4ee5\u4e0b\u7684\u4f18\u5316\u7ecf\u9a8c\u3002 1. \u7f51\u7edc\u5e26\u5bbd Hadoop\u96c6\u7fa4\u7684\u670d\u52a1\u5668\u5728\u89c4\u5212\u65f6\u5c31\u5728\u7edf\u4e00\u7684\u4ea4\u6362\u673a\u4e0b\uff0c\u8fd9\u662f\u5728\u5b98\u65b9\u6587\u6863\u4e2d\u5efa\u8bae\u7684\u90e8\u7f72\u65b9\u5f0f\u3002 \u4f46\u662f\u6211\u4eec\u7684\u8fd9\u53f0\u4ea4\u6362\u673a\u548c\u5176\u4ed6\u4ea4\u6362\u673a\u7684\u4e92\u8054\u5e26\u5bbd\u6709\u9650\uff0c\u6240\u4ee5\u5728\u5ba2\u6237\u7aef\u9047\u5230\u4e86HDFS\u8bbf\u95ee\u901f\u5ea6\u6162\u7684\u95ee\u9898\u3002 \u628a\u64cd\u4f5c\u96c6\u7fa4\u7684\u5ba2\u6237\u7aef\u4e5f\u8054\u5165DataNode\u7684\u4ea4\u6362\u673a\u5185\u90e8\uff0c\u89e3\u51b3\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002 2. \u7cfb\u7edf\u53c2\u6570 \u5bf9ulimit -c\u7684\u4fee\u6539\u4e5f\u662f\u5b98\u65b9\u6587\u6863\u5efa\u8bae\u7684\u4fee\u6539\uff0c\u5728\u96c6\u7fa4\u53ea\u670910\u53f0\u670d\u52a1\u5668\u65f6\uff0c\u5e76\u6ca1\u6709\u9047\u5230\u95ee\u9898\u3002 \u968f\u7740\u673a\u5668\u589e\u52a0\u548c\u4efb\u52a1\u589e\u52a0\uff0c\u8fd9\u4e2a\u503c\u9700\u8981\u6539\u7684\u66f4\u5927\u3002 3. \u914d\u7f6e\u6587\u4ef6\u7ba1\u7406 \u8fd9\u4e2a\u96c6\u7fa4\u7528\u7684\u662fCloudera\u53d1\u884c\u7684\u7248\u672c\uff0c\u914d\u7f6e\u6587\u4ef6\u9ed8\u8ba4\u5b58\u5728\/etc\/hadoop\/conf\u4f4d\u7f6e\u3002\u8fd9\u662f\u4e00\u4e2a\u53ea\u6709root\u624d\u80fd\u4fee\u6539\u7684\u4f4d\u7f6e\u3002 \u4e3a\u4e86\u4fee\u6539\u65b9\u4fbf\uff0c\u6211\u628a\u914d\u7f6e\u6587\u4ef6\u7edf\u4e00\u4fdd\u5b58\u5728\u4e00\u53f0\u673a\u5668\u4e0a\uff0c\u4fee\u6539\u540e\u7528\u811a\u672c\u5206\u53d1\u3002\u4fdd\u8bc1\u6240\u6709\u670d\u52a1\u5668\u90fd\u662f\u7edf\u4e00\u7684\u914d\u7f6e\u3002 4. mapred.tasktracker.map.tasks.maximum \u8fd9\u4e2a\u53c2\u6570\u63a7\u5236\u6bcf\u4e2aTaskTracker\u540c\u65f6\u8fd0\u884c\u7684Map\u4efb\u52a1\u6570\u3002 \u4ee5\u524d\u7684\u8bbe\u7f6e\u662f\u548cCPU\u6838\u6570\u76f8\u540c\u7684\uff0c\u5076\u5c14\u9047\u5230\u4efb\u52a1\u6324\u5360DataNode\u8d44\u6e90\u7684\u95ee\u9898\u3002 \u73b0\u5728\u6539\u6210map+reduce+1==num_cpu_cores\u3002 5. \u4e25\u683c\u63a7\u5236root\u6743\u9650 Cloudera\u7684\u53d1\u884c\u7248\u4f1a\u521b\u5efa\u4e00\u4e2ahadoop\u7528\u6237\uff0c\u5404\u79cd\u5b88\u62a4\u8fdb\u7a0b\u90fd\u5e94\u8be5\u4ee5\u8fd9\u4e2a\u7528\u6237\u8fd0\u884c\u3002 \u66fe\u7ecf\u6709\u8bef\u64cd\u4f5c\uff08\/usr\/lib\/hadoop\/bin\/hadoop datanode &\uff09\u5bfc\u81f4\u672c\u5730\u7684\u6570\u636e\u76ee\u5f55\u88abroot\u5199\u5165\u65b0\u6587\u4ef6\uff0c\u4e8e\u662f\u6b63\u786e\u542f\u52a8\u7684hadoop\u7528\u6237\u8fdb\u7a0b\u65e0\u6cd5\u8bfb\u5199\u3002 \u6240\u4ee5\u73b0\u5728\u7684\u96c6\u7fa4\u670d\u52a1\u5668\u4e0d\u63d0\u4f9b\u65e5\u5e38\u7684root\u6743\u9650\u8bbf\u95ee\u3002 6. Java\u7684GC\u6a21\u5f0f \u5728mapred.child.java.opts\u548cHADOOP_OPTS\u90fd\u589e\u52a0\u4e86-XX:+UseConcMarkSweepGC\u3002 JDK\u7684\u6587\u6863\u4e2d\u63a8\u8350\u73b0\u4ee3\u591a\u6838\u5904\u7406\u5668\u7cfb\u7edf\uff0c\u91c7\u7528\u8fd9\u79cdGC\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5145\u5206\u5229\u7528CPU\u7684\u5e76\u53d1\u80fd\u529b\u3002 \u8fd9\u4e2a\u6539\u52a8\u5bf9\u6027\u80fd\u7684\u79ef\u6781\u5f71\u54cd\u5f88\u5927\u3002 7. \u9009\u62e9\u6b63\u786e\u7684JDK \u8fd9\u4e2a\u96c6\u7fa4\u6709\u90e8\u5206\u670d\u52a1\u5668\u7684JDK\u7528\u7684\u662f32\u4f4d\u7248\u672c\uff0c\u4e0d\u80fd\u521b\u5efa-Xmx4g\u4ee5\u4e0a\u7684\u8fdb\u7a0b\u3002 \u7edf\u4e00\u4e3ax64\u7248\u672c\u7684JDK\u3002 8. mapred.reduce.slowstart.completed.maps \u8fd9\u4e2a\u53c2\u6570\u63a7\u5236slowstart\u7279\u6027\u7684\u65f6\u673a\uff0c\u9ed8\u8ba4\u662f\u57285%\u7684map\u4efb\u52a1\u5b8c\u6210\u540e\uff0c\u5c31\u5f00\u59cb\u8c03\u5ea6reduce\u8fdb\u7a0b\u542f\u52a8\uff0c\u5f00\u59cbcopy\u8fc7\u7a0b\u3002 \u4f46\u662f\u6211\u4eec\u7684\u673a\u5668\u6570\u91cf\u4e0d\u591a\uff0c\u6709\u4e00\u6b21\u5927\u91cf\u7684\u4efb\u52a1\u5806\u79ef\u5728JobTracker\u91cc\uff0c\u6bcf\u4e2aTaskTracker\u7684map\u548creduce slots\u90fd\u8dd1\u6ee1\u4e86\u3002 \u7531\u4e8emap\u6ca1\u6709\u8db3\u591f\u8d44\u6e90\u8fc5\u901f\u5b8c\u6210\uff0creduce\u4e5f\u5c31\u65e0\u6cd5\u7ed3\u675f\uff0c\u9020\u6210\u96c6\u7fa4\u7684\u8d44\u6e90\u4e92\u76f8\u6b7b\u9501\u3002 \u628a\u8fd9\u4e2a\u53c2\u6570\u6539\u6210\u4e860.75\uff0c\u4efb\u52a1\u5806\u79ef\u7684\u5217\u8868\u4ece\u5e73\u574710\u4e2a\uff0c\u53d8\u6210\u4e863\u4e2a\u3002 9. mapred.fairscheduler.preemption \u8fd9\u4e2a\u53c2\u6570\u8bbe\u4e3a\u4e86true\u3002\u4ee5\u4fbffairscheduler\u5728\u7528\u6237\u6700\u5c0f\u8d44\u6e90\u4e0d\u80fd\u6ee1\u8db3\u65f6\uff0ckill\u5176\u4ed6\u4eba\u7684\u4efb\u52a1\u817e\u51fa\u8db3\u591f\u7684\u8d44\u6e90\u3002 \u96c6\u7fa4\u8fd0\u884c\u7740\u5404\u79cd\u7c7b\u578b\u7684\u4efb\u52a1\uff0c\u6709\u4e9bmap\u4efb\u52a1\u9700\u8981\u8fd0\u884c\u6570\u5c0f\u65f6\u3002\u8fd9\u4e2a\u53c2\u6570\u4f1a\u5bfc\u81f4\u8fd9\u7c7b\u4efb\u52a1\u88ab\u9891\u7e41kill\uff0c\u51e0\u4e4e\u65e0\u6cd5\u5b8c\u6210\u3002\u66fe\u7ecf\u6709\u4e2a\u4efb\u52a1\u57287\u5c0f\u65f6\u5185\u88abkill\u4e86137\u6b21\u3002 \u53ef\u4ee5\u901a\u8fc7\u8c03\u6574fairscheduler\u7684pool\u914d\u7f6e\u89e3\u51b3\uff0c\u7ed9\u8fd9\u79cd\u4efb\u52a1\u5355\u72ec\u914d\u7f6e\u4e00\u4e2aminMap==maxMap\u7684pool\u3002 10. mapred.jobtracker.completeuserjobs.maximum \u9650\u5236\u6bcf\u4e2a\u7528\u6237\u5728JobTracker\u7684\u5185\u5b58\u4e2d\u4fdd\u5b58\u4efb\u52a1\u7684\u4e2a\u6570\u3002 \u56e0\u4e3a\u8fd9\u4e2a\u53c2\u6570\u8fc7\u5927\uff0c\u6211\u4eec\u7684JobTracker\u542f\u52a8\u4e0d\u523024\u5c0f\u65f6\u5c31\u4f1a\u9677\u5165\u9891\u7e41\u7684FullGC\u5f53\u4e2d\u3002 \u76ee\u524d\u6539\u4e3a5\uff0cJT\u5e73\u7a33\u8fd0\u884c\u4e00\u5929\u5904\u74061500\u4e2a\u4efb\u52a1\uff0c\u53ea\u5360\u7528800M\u5185\u5b58\u3002 \u8fd9\u4e2a\u53c2\u6570\u5728>0.21.0\u5df2\u7ecf\u6ca1\u6709\u5fc5\u8981\u8bbe\u7f6e\u4e86\uff0c\u56e0\u4e3a0.21\u7248\u672c\u6539\u9020\u4e86completeuserjobs\u7684\u7528\u6cd5\uff0c\u4f1a\u5c3d\u5feb\u7684\u5199\u5165\u78c1\u76d8\uff0c\u4e0d\u518d\u5185\u5b58\u4e2d\u957f\u671f\u5b58\u5728\u4e86\u3002 11. […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[9,4,5],"tags":[24],"class_list":["post-81","post","type-post","status-publish","format-standard","hentry","category-hadoop","category-renren","category-tech","tag-hadoop"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/posts\/81","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/comments?post=81"}],"version-history":[{"count":7,"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/posts\/81\/revisions"}],"predecessor-version":[{"id":84,"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/posts\/81\/revisions\/84"}],"wp:attachment":[{"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/media?parent=81"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/categories?post=81"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinofool.net\/blog\/wp-json\/wp\/v2\/tags?post=81"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}