我與星火2.1.1和Scala 2.11.8「java.lang.UnsupportedOperationException:空集」
工作,我在執行星火殼我的代碼。這是我執行的代碼
val read_file1 = sc.textFile("Path to file 1");
val uid = read_file1.map(line => line.split(",")).map(array => array.map(arr => {
| if(arr.contains(":")) (array(2).split(":")(0), arr.split(":")(0))
| else (array(2).split(":")(0), arr)}))
val rdd1 = uid.map(array => array.drop(4)).flatMap(array => array.toSeq).map(y=>(y,1)).reduceByKey(_+_)
我這段代碼的輸出是:
((v67430612_serv78i, fb_201906266952256),1)
((v74005958_serv35i, fb_128431994336303),1)
但是兩個RDDS'的輸出,當我執行:
uid2.map(x => ((x._1, x._2), x._3)).join(rdd1).map(y => ((y._1._1, y._1._2, y._2._1), y._2._2))
我得到錯誤:
"java.lang.UnsupportedOperationException: empty collection"
爲什麼我得到這個錯誤?
以下是輸入文件的樣本: -
文件1:
2017-05-09 21:52:42 , 1494391962 , p69465323_serv80i:10:450 , 7 , fb_406423006398063:396560, guest_861067032060185_android:671051, fb_100000829486587:186589, fb_100007900293502:407374, fb_172395756592775:649795
2017-05-09 21:52:42 , 1494391962 , z67265107_serv77i:4:45 , 2:Re , fb_106996523208498:110066, fb_274049626104849:86632, fb_111857069377742:69348, fb_127277511127344:46246
文件2:
fb_100008724660685,302502,-450,v300430479_serv73i:10:450,switchtable,2017-04-30 00:00:00
fb_190306964768414,147785,-6580,r308423810_serv31i::20,invite,2017-04-30 00:00:00
我剛纔所指出的:當我執行
rdd1.take(10).foreach(println) or rdd1.first()
我收到此消息在輸出之前:
WARN Executor: Managed memory leak detected; size = 39979424 bytes, TID = 11
我不知道這是否與問題有關?
另注:此錯誤只有當我做
res.first()
爲
uid2.map(x => ((x._1, x._2), x._3)).join(rdd1).map(y => ((y._1._1, y._1._2, y._2._1), y._2._2))
發生在做
res.take(10).foreach(println)
我沒有得到任何輸出,但不會返回錯誤無論是。
你能分享整個異常堆棧跟蹤嗎? – stefanobaghino
@ stefanobaghino我沒有整個堆棧跟蹤。我得到... 48消息的消息。請讓我知道如何讓整個事情 – PixieDev
所以你只能得到一個單一的線,上面寫着'java.lang.UnsupportedOperationException:空collection'? – stefanobaghino