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[英]python splitting group of lines in text file in sparate files based on pattern
[英]Splitting a text file based on empty lines in Spark
我正在處理一個非常大的文件,它是一個幾乎 2GB 的非常大的文本文檔。
像這樣的東西 -
\#\*MOSFET table look-up models for circuit simulation
\#t1984
\#cIntegration, the VLSI Journal
\#index1
\#\*The verification of the protection mechanisms of high-level language machines
\#@Virgil D. Gligor
\#t1984
\#cInternational Journal of Parallel Programming
\#index2
\#\*Another view of functional and multivalued dependencies in the relational database model
\#@M. Gyssens, J. Paredaens
\#t1984
\#cInternational Journal of Parallel Programming
\#index3
\#\*Entity-relationship diagrams which are in BCNF
\#@Sushil Jajodia, Peter A. Ng, Frederick N. Springsteel
\#t1984
\#cInternational Journal of Parallel Programming
\#index4
我想在 spark 中讀取它們並根據 spark 中的空塊拆分它們並在 PySpark 中創建這些數據的塊。
#*Entity-relationship diagrams which are in BCNF #@Sushil Jajodia, Peter A. Ng, Frederick N. Springsteel #t1984 #cInternational Journal of Parallel Programming #index4
我目前寫的代碼是rdd = sc.textFile('acm.txt').flatMap( lambda x: x.split("\n\n") )
據我了解,您想在 spark 中讀取此文本文件,並且每段有一條記錄。 為此,您可以像這樣更改記錄分隔符(默認情況下為\n
):
在 scala 中:
sc.hadoopConfiguration.set("textinputformat.record.delimiter","\n\n")
val rdd = sc.textFile("acm.txt")
在 python 中(您需要訪問 java spark 上下文才能訪問 hadoop 配置):
sc._jsc.hadoopConfiguration().set("textinputformat.record.delimiter","\n\n")
rdd = sc.textFile("acm.txt")
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