0

次の列ファミリーを Cassandra に保存しています

Mac Address // PKEY
TimeStamp // PKEY
LocationID
ownerName
Signal Strength

主キーは (Mac アドレス、タイムスタンプ) です。

各行のサイズは約 100 バイトです。それぞれ 1 GB / 512 MB の RAM と 25 GB のディスクを備えた 4 つのノードからなる Cassandra クラスターがあります。上記の列ファミリーの 2,000 万行を挿入しました (これは 2 GB に相当します)。挿入された各行には異なる MacAddress があるため、同じ MAC アドレスを持つ 2 つの行はありません。私が理解していることから、パーティションは MacAddress で発生し、同じ MAC がないため、2,000 万行が均等に (ほぼ) 分散されるはずです。驚いたことに、データの 99.7% が 1 つのノードにしか存在していませんでした。他の 3 つのノードには、行数がほとんどありませんでした。私のレプリケーション係数は 1 に設定されました (この設定は PoC のみに使用しているため)。

そのようなことが起こり得るケースはありますか？この問題に近いものをウェブ上で見つけることができませんでした。

Datacenter: datacenter1
==========
Replicas: 1

Address         Rack        Status State   Load            Owns                Token                                       
                                                                               9158199868423703627                         
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367184151655397632                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367194907514299830                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367205663373202028                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367216419232104226                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367227175091006423                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367237930949908621                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367248686808810819                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367259442667713017                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367270198526615214                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367280954385517412                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367291710244419610                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367302466103321808                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367313221962224005                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367323977821126203                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367334733680028401                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367345489538930599                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367356245397832796                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367367001256734994                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367377757115637192                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               367388512974539390                          
.....
.....
.....
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368646948466096527                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368657704324998725                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368668460183900923                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368679216042803121                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368689971901705318                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368700727760607516                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368711483619509714                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368722239478411912                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368732995337314109                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368743751196216307                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368754507055118505                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368765262914020703                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368776018772922900                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368786774631825098                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368797530490727296                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368808286349629494                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368819042208531691                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368829798067433889                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368840553926336087                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368851309785238285                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368862065644140482                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368872821503042680                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368883577361944878                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368894333220847076                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368905089079749273                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368915844938651471                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368926600797553669                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368937356656455867                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368948112515358064                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368958868374260262                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368969624233162460                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368980380092064658                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               368991135950966855                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369001891809869053                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369012647668771251                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369023403527673449                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369034159386575646                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369044915245477844                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369055671104380042                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369066426963282240                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369077182822184437                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369087938681086635                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369098694539988833                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369109450398891031                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369120206257793228                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369130962116695426                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369141717975597624                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369152473834499822                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369163229693402019                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369173985552304217                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369184741411206415                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369195497270108613                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369206253129010810                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369217008987913008                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369227764846815206                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369238520705717404                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369249276564619601                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369260032423521799                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369270788282423997                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369281544141326195                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369292300000228392                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369303055859130590                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369313811718032788                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369324567576934986                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369335323435837183                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369346079294739381                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369356835153641579                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369367591012543777                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369378346871445974                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369389102730348172                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369399858589250370                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369410614448152568                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369421370307054765                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369432126165956963                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369442882024859161                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369453637883761359                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369464393742663556                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369475149601565754                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369485905460467952                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369496661319370150                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369507417178272347                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369518173037174545                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369528928896076743                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369539684754978941                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369550440613881138                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369561196472783336                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369571952331685534                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369582708190587732                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369593464049489929                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369604219908392127                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369614975767294325                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369625731626196523                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369636487485098720                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369647243344000918                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369657999202903116                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369668755061805314                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369679510920707511                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369690266779609709                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369701022638511907                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369711778497414105                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369722534356316302                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369733290215218500                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369744046074120698                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369754801933022896                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369765557791925093                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369776313650827291                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369787069509729489                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369797825368631687                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369808581227533884                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369819337086436082                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369830092945338280                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369840848804240478                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369851604663142675                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369862360522044873                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369873116380947071                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369883872239849269                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369894628098751467                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369905383957653665                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369916139816555863                          
192.168.121.176 rack1       Up     Normal  758.61 KB       0.03%               369926895675458061                          
192.168.121.129 rack1       Up     Normal  9.5 MB          0.18%               3898129039052635843                         
192.168.121.129 rack1       Up     Normal  9.5 MB          0.18%               3898262574450307387                         
192.168.121.129 rack1       Up     Normal  9.5 MB          0.18%               -4748915780896388021                        
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              -4676858186858460085                        
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              -4604800592820532149                        
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              -4532742998782604213
....
....
....
....
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              3970053097692892235                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4042110691730820171                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4114168285768748107                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4186225879806676043                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4258283473844603979                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4330341067882531915                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4402398661920459851                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4474456255958387787                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4546513849996315723                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4618571444034243659                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4690629038072171595                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4762686632110099531                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4834744226148027467                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4906801820185955403                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              4978859414223883339                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5050917008261811275                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5122974602299739211                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5195032196337667147                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5267089790375595083                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5339147384413523019                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5411204978451450955                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5483262572489378891                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5555320166527306827                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5627377760565234763                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5699435354603162699                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5771492948641090635                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5843550542679018571                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5915608136716946507                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              5987665730754874443                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6059723324792802379                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6131780918830730315                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6203838512868658251                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6275896106906586187                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6347953700944514123                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6420011294982442059                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6492068889020369995                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6564126483058297931                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6636184077096225867                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6708241671134153803                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6780299265172081739                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6852356859210009675                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6924414453247937611                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              6996472047285865547                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7068529641323793483                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7140587235361721419                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7212644829399649355                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7284702423437577291                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7356760017475505227                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7428817611513433163                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7500875205551361099                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7572932799589289035                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7644990393627216971                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7717047987665144907                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7789105581703072843                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7861163175741000779                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              7933220769778928715                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8005278363816856651                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8077335957854784587                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8149393551892712523                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8221451145930640459                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8293508739968568395                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8365566334006496331                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8437623928044424267                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8509681522082352203                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8581739116120280139                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8653796710158208075                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8725854304196136011                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8797911898234063947                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8869969492271991883                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              8942027086309919819                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              9014084680347847755                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              9086142274385775691                         
192.168.121.192 rack1       Up     Normal  5.86 GB         99.72%              9158199868423703627
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データの 99% が 1 つのノードにあることをどのように「確認」しましたか? 私が尋ねる理由は、数日前に同様の問題があったためですが、私のシナリオがあなたのシナリオと同じかどうかはわかりません. 1.2 Datastax コミュニティ エディションが最初にリリースされたときにインストールしました。データの 99.7% が 1 つのノードにあることがわかりました。1.2 用の最新の AMI を使用することにし、データ挿入テストを再度実行してから、nodetool -h localhost リングを実行しました。nodetool スクリプトが更新されたのは、均等な分布が見られ、512 個のノードすべてがリストされていなかったからだと思います。代わりに 2 つのノードがリストされました。

于 2013-02-27T08:45:07.747 に答える