-
Why is it necessary to start start-all on master when starting a spark cluster, and startup failure occurs when starting start-all on slave?
what is the process of running start-all to start a spark cluster? ...
-
Why can't you access the properties of an object in the method of spark: scala?
how to understand the content of the green part? Why does it feel so awkward? the feeling in the book is also very vague.
...
-
On the understanding of scala Grammar in Spark
val lines: Dataset[String] = session.read.textFile("")
val words: Dataset[String] = lines.flatMap(_.split(" "))
linesdataSetflatMapdataSetIDEAflatMap:
def flatMap[U : Encoder](func: T => Traversabl...
-
Call Spark mllib linear regression to print weights and other coefficients are all NaN
use spark mllib linear regression to do traffic forecast printing training, weight and other coefficients are all NaN
data format: 520221 | 0009 | 0009 | 292 | 000541875150 | 2018 | 04 | 18 | 11 | 3 | 137 520626 | 0038 | 0038 | 520626 | 2030300010...
-
The worker in the spark cluster is always unable to connect to the master, zookeeper cluster to achieve master high availability?
1Query spark0-2 the three hosts are zookeeper clusters
2 spark0-4 five hosts are spark clusters
3 spark0-1 two hosts achieve master high availability.
run start-all.sh on spark0 to start the spark cluster. At this point, spark will be launched nat...
-
Is the data of the same field after spark groupby in the same partition?
suppose there are ten partitions in a RDD. When you groupby this RDD, you get a new RDD,. Is the data of the same field in the same partition?
my test results show that data from the same grouping field is divided into the same partition, and data fro...
-
I would like to ask Spark'DataFrame to edit only one column (intercept a paragraph) and return the new DataFrame.
ask Spark DataFrame to edit only one column (intercept a paragraph) and return a new DataFrame ...
-
The Zeppelin tutorial code runs with an error.
refer to the link description to run the tutorial code in the web notebook provided by the zeppelin container. Import local file:
val bankText = sc.textFile("D: Projects Zeppelin bank bank-full.csv")
case class Bank(age:Integer, job:Stri...
-
Are there any open source middleware or components for traffic distribution?
are there any open source middleware products that provide traffic marking and traffic distribution? that is, when a http request comes, you can route the request to the specified machine or environment according to the information of various dimension...
-
How to sort the Int type instead of the String type when sparksql operates the csv sort
Dataset<Row> df = spark.read().format("csv").load("C: develop intellij-workspace SparkSqlDemos resources down.csv");
df.createOrReplaceTempView("down");
Dataset<Row> dfSQL = spark.sql("SELECT ...
-
Spark Job submission error: Initial job has not accepted any resources;.
I use IntelliJ IDEA locally for spark development and report an error when submitting it to the cluster to run. After searching, all the answers point to insufficient CPU memory resources, but I have set up enough CPU memory resources, and the state o...
-
CreateDirectStream.foreachRDD error calling external object
the figure is as follows:
def update_model(rdd),mixture_model:
it s OK to declare mixture_model directly in update_model, but every time you foreachRDD, you need to re-declare MingleModel. Makes it impossible to update the model in real time
...
-
Error NativeCodeLoader:62 after installing pyspark in win10
configure spark s environment according to this link https: blog.csdn.net w417950., but will report an error when starting:
I searched for it and didn t find a way to solve my problem. Beginners on the road, please forgive me
...
-
AWS EC2-Initial job has not accepted any resources
Slaves had registered, but cannot pass work to slave. (Standalone)
If I open all of the Inbound TCP port, it can work.
But I cannot do it, because it is about security.
2018-06-04 13:22:44 INFO DAGScheduler:54 - Submitting 100 missing tasks from...
-
You have greatly helped me to see if my processing method is reasonable [a large number of Json files are read, parsed and imported into elasticsearch].
< H2 > Business scenario < H2 >
A large number of json files need to be read and re-parsed and imported into elasticsearch . Json files are saved in different date folders. The size of a single folder is about 80g. The number of json files under the ...
-
Why did pyspark fail to call python third-party libraries in RDD?
problem description
Hi, I called the jieba participle when I was running pyspark on the company line, and found that I could successfully import, but when I called the participle function in RDD, it suggested that there was no module jieba, without th...
-
Spark sql parses the json of an array of nested objects
1. Json data is now available as follows
{ "id ": 11, "data ": [{ "package ": "com.browser1 ", "activetime ": 60000}, { "package ": "com.browser6 ", "activetime ": 1205000}, { "package ": "com.browser7 ", "activetime ": 1205000}]}
{ "id ": 12...
-
How can two large pieces of data in spark avoid shuffle in join?
purpose: there are two large pieces of data in spark that require join,. Both input data contain the field userid. Now you need to associate them according to userid. I hope to avoid shuffle.
completed: I pre-processed two pieces of data into 1w f...
-
Use spark or hadoop to delete duplicate two-way relational data
I have a batch of data (10 billion) as follows,
ID FROM TO
1 A B
2 A C
3 B A
4 C A
Delete duplicate two-way relational data as follows
ID FROM TO
1 A B
2 A C
1. Because the amount of data is too large, bloomfilter is no...
-
Can the program that calls Spark be started directly in Java-jar mode?
I wrote a worldcount program for spark, which can be debugged in eclipse using local mode, or run through the maven packaged java-jar command:
SparkConf sparkConf = new SparkConf().setAppName("JavaWordCount");
sparkConf.setMaster("loc...
