Video: Cov lus txib twg pab qhia cov ntaub ntawv lossis cov npe hauv Hadoop?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Hadoop HDFS Cov ls Hais kom ua Nqe lus piav qhia:
Cov Hadoop fs cev lus txib ls qhia cov npe ntawm cov ntsiab lus ntawm a phau ntawv teev nyob rau hauv lub txoj kev muab los ntawm tus neeg siv. Nws qhia lub npe, kev tso cai, tus tswv, qhov loj me, thiab hnub hloov kho rau txhua tus ntaub ntawv los yog directory nyob rau hauv qhov teev phau ntawv.
Tom qab ntawd, kuv yuav saib cov ntaub ntawv hauv Hadoop li cas?
Cov haoop ua fs -ls hais kom ua tso cai rau koj saib tus cov ntaub ntawv thiab directory hauv koj HDFS filesystem, ntau npaum li cov lus txib ls ua haujlwm ntawm Linux / OS X / * nix. Tus neeg siv lub tsev directory hauv HDFS yog nyob ntawm /user/userName.
Kuj Paub, Kuv yuav ua li cas thiaj tsim tau ib daim nplaub tshev hauv Hadoop file system?
- Tsim ib daim ntawv teev npe hauv HDFS. Kev siv: $ hdfs dfs -mkdir
- Sau cov ntsiab lus ntawm cov npe hauv HDFS.
- Upload ib cov ntaub ntawv rau HDFS.
- Download tau ib cov ntaub ntawv los ntawm HDFS.
- Kos ib lub xeev cov ntaub ntawv hauv HDFS.
- Saib cov ntsiab lus ntawm cov ntaub ntawv hauv HDFS.
- Luam ib cov ntaub ntawv los ntawm qhov chaw mus rau qhov chaw nyob hauv HDFS.
- Luam ib cov ntaub ntawv los ntawm / rau Local file system rau HDFS.
Yog li ntawd, txoj kev HDFS ntawm cov ntaub ntawv nyob qhov twg?
Nrhiav HDFS Txoj Kev URL hauv Hadoop Kev teeb tsa Cov ntaub ntawv Tam sim no siv lub HDFS kev teeb tsa ntaub ntawv koj ua tau nrhiav los yog hloov cov HDFS txoj kev URL. Mus rau kab 190 ntawm tus hdfs ua - chaw. xml ntaub ntawv hauv qab no rau nrhiav HDFS Txoj Kev URL. Rau qhov piv txwv cluster nws yog node2.
Hdfs DFS command yog dab tsi?
HDFS hais kom ua txav cov ntaub ntawv los ntawm qhov chaw mus rau qhov chaw. Qhov no lus txib tso cai rau ntau qhov chaw ib yam nkaus, nyob rau hauv rooj plaub uas lub hom phiaj xav tau ib daim ntawv teev npe. Kev siv: hdfs ua -mv Hais kom ua : hdfs ua -mv /user/ haoop ua /file1 /user/ haoop ua /file2.
Pom zoo:
Cov lus txib twg qhia cov ntsiab lus ntawm lub rooj sib tham?
Koj tuaj yeem tso saib cov lus qhia cov ntsiab lus nrog netstat -nr hais kom ua. Qhov kev xaiv -r qhia netstat los tso saib lub rooj sib tham, thiab qhov kev xaiv -n qhia netstat los tso saib cov lus hauv daim ntawv lej
Cov lus txib twg qhia txog NAT cov lus txhais?
Table 4-4 Command Summary Command Description show ip nat statistics Qhia NAT cov txheeb cais. qhia ip nat translations [verbose] Qhia NAT rooj
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Dab tsi yog cov ntaub ntawv kos npe lossis cov ntaub ntawv headers raws li siv hauv digital forensics?
Hom Cov Ntaub Ntawv Ib daim ntawv kos npe yog ib qho tshwj xeeb ntawm kev txheeb xyuas bytes sau rau hauv cov ntaub ntawv header. Ntawm lub Windows system, cov ntaub ntawv kos npe ib txwm muaj nyob hauv thawj 20 bytes ntawm cov ntaub ntawv. Cov ntaub ntawv sib txawv muaj cov ntaub ntawv sib txawv; Piv txwv li, Windows Bitmap duab file (
Cov lus txib twg hloov cov ntaub ntawv pab pawg tswv?
Cov lus txib chown hloov tus tswv ntawm cov ntaub ntawv, thiab cov lus txib chgrp hloov cov pab pawg. Ntawm Linux, tsuas yog hauv paus tuaj yeem siv chown rau kev hloov cov tswv cuab ntawm cov ntaub ntawv, tab sis txhua tus neeg siv tuaj yeem hloov pab pawg mus rau lwm pab pawg nws koom nrog