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]???䨮??t?n3HDFS MR YARN??Bo??Application?r?3

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Posted on: 02/01/18

Hadoop

HDFS??B

HDFS?Hadoop??????|??K??HDFS?D??????C???2???????t???t???J?3Y??@?1???Y?eD????HDFS????GB?TB???e???t????^¨?x???t???t?????Y2?¨aw?F??@??????HDFS??D????1?c?2??Namenodeꡧmaster???X?2?2????2?????D??HA????a???D?S?????1?c?2??Datanodesꡧsalve??Namenode1?c?Q??Q1?c??¨a????1???t??y??a??tꡧ?¨a㨹??T????DT?????䨮D??Dꨰ?ǫ?D????????a?L????t2a???^Namenode??????Datanode1??1?c???t?D??o??|??K????????rg??t?cNamenode??gD???CD????y_D??ꨰ???䨮???t?K䨮D?ꡧ3꨺?128M?2??D?????????t?t?HDFS?3?????????t?K???|?Datanode???Namenode1?c???????|???t??y?MDD2¡????¡ꡧput??????Ydꡧget??????t????D????tꡧmkdir?????????h3y???t???????o???t?MDD?????̨2?ꨨ?1??????ax?HDFS????t??Da????Namenode?Namenode??t???????a???t?K???o?t?????????????????Datanodex???t?2¨?t?Namenodel?????Y1?????HDFS???DD?linux??y??????䨮䨮??2t????D????|NameNode?2?ta?ꡧ?¨a??????|??fa????a??S???t??a??t??2t?????y???D??????y?D??????Namenode??????Y?SecondaryNamenode????¨a1|??o?3?R?????t?Kl?oNamenode1?c?

MapReduce??B

MapReduce????No????????D??maporeduce????A???M3???䨮????t???KDD????mapo?̨3꨺???x???tꡧ?F?????3??S????????????t?D??t?3?I??|?????MDDx?x???????MDD??t??reduceo?̨????map????t-??^????|??t?MDD?I??|?oo??K??2??^?I??|????????t?MapReduce??D????KDD?2???map???????g???2??????t???^?I??|????M???2??D??????reduce??MDD???s???t?

Apache Hadoop YARN ??Application??^3?

Hadoop YARNw?F??M3??D????M3???ReSourceManager?M3oNodeManager?M3???1|??¨a㨹Y?1o????{??O????@????????|a???o?M3?

?????o????F1|?????

?¨a?D???????Y?1?(ReSourceManager)o????Application??D???AM(ApplicationMaster)?

?a?????????job?2????KDDjobs,?????DAG jobs?

YARN?ResourceManageroNodeManager?M3?Y??{????

??y?D?D?a??Da?Y????ResourceManager???????NodeManager?|containerY?????oO??????Y?䨺1???r??K??騺1???r????oResourceManager?

ResourceManager?????o?D?D?a??Y?䡤???ꡧY?㨹???CPU??P??W?j̨̨?,

NodeManager?????DD?K?1?1?c?Y?¡ꡧY??o1??Y??

?????a???D???ApplicationMaster???????ResourceManager??Application?Da?Y??

???aoNodeManager??e????KO???????DD??r?

??App?YARN???N?{?Y????

?{??D

Client??Application?ResourceManager(㨹ScheduleroApplicationManager????M?t)?ApplicationManager??Application??K????NodeManager????????container???DDApplicationMaster??App??Y??D?DD???NodeManager?????AM????AM?RM?Scheduler(?????o2????a????Y?)?M?t??Y??O??????DD?M?o???r?

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