Cov zis ntawm Mapper (cov ntaub ntawv nruab nrab) yog khaws cia ntawm lub Local file system (tsis yog HDFS) ntawm txhua tus neeg mapper cov ntaub ntawv nodes. Qhov no feem ntau yog cov npe ib ntus uas tuaj yeem teeb tsa hauv kev teeb tsa los ntawm Hadoop tus thawj coj.
MapReduce nruab nrab cov ntaub ntawv nyob qhov twg?
- Cov ntaub ntawv qhia tawm (cov ntaub ntawv nruab nrab) yog khaws cia rau hauv Local file system (NOT HDFS) ntawm txhua tus neeg mapper nodes. …
- Kuv xav tias qhov no yog qhov ntsuas uas yuav tsum tau hloov pauv hloov cov ntaub ntawv nruab nrab qhov chaw..
- mapreduce.cluster.local.dir.
- Vam qhov no yuav pab tau.
tus mapper cov zis khaws cia nyob qhov twg?
9) Mapper cov ntaub ntawv khaws cia nyob qhov twg? Cov ntaub ntawv tseem ceeb ntawm tus nqi nruab nrab ntawm cov ntawv tso tawm mapper yuav muab khaws cia rau ntawm cov ntaub ntawv hauv cheeb tsam ntawm mapper nodes. Qhov chaw teev npe no tau teeb tsa hauv cov ntaub ntawv teeb tsa los ntawm Hadoop Admin.
Dab tsi yog cov ntaub ntawv nruab nrab hauv MapReduce?
Cov ntaub ntawv nruab nrab cov ntaub ntawv yog tsim los ntawm daim ntawv qhia thiab txo cov haujlwm hauv cov npe (qhov chaw) ntawm cov disk hauv zos. … Cov ntaub ntawv tso tawm tsim los ntawm daim ntawv qhia kev ua haujlwm uas yog cov tswv yim rau kev txo cov haujlwm. Cov ntaub ntawv ib ntus tsim los ntawm kev txo cov haujlwm.
qhov tawm ntawm daim ntawv qhia sau hauv Hadoop nyob qhov twg?
Nyob hauv Hadoop, cov zis ntawm Mapper yog khaws cia rau hauv lub zos disk, vim nws yog qhov nruab nrab cov zis. Tsis tas yuav khaws cov ntaub ntawv nruab nrabntawm HDFS vim: cov ntaub ntawv sau yog kim thiab suav nrog kev rov ua dua uas ua rau tus nqi nce ntxiv thiab lub sijhawm.
