apache spark sql - unable to load data from parquet files to hive external table -


i have written below scala code create parquet file

scala> case class person(name:string,age:int,sex:string) defined class person  scala> val data = seq(person("jack",25,"m"),person("john",26,"m"),person("anu",27,"f")) data: seq[person] = list(person(jack,25,m), person(john,26,m), person(anu,27,f))  scala> import  sqlcontext.implicits._ import sqlcontext.implicits._  scala> import org.apache.spark.sql.savemode import org.apache.spark.sql.savemode  scala> df.select("name","age","sex").write.format("parquet").mode("overwrite").save("sparksqloutput/person")

hdfs status:

[cloudera@quickstart ~]$ hadoop fs -ls sparksqloutput/person found 4 items -rw-r--r--   1 cloudera cloudera          0 2017-08-14 23:03 sparksqloutput/person/_success -rw-r--r--   1 cloudera cloudera        394 2017-08-14 23:03 sparksqloutput/person/_common_metadata -rw-r--r--   1 cloudera cloudera        721 2017-08-14 23:03 sparksqloutput/person/_metadata -rw-r--r--   1 cloudera cloudera        773 2017-08-14 23:03 sparksqloutput/person/part-r-00000-2dd2f334-1985-42d6-9dbf-16b0a51e53a8.gz.parquet

then have created external hive table using command below

hive> create external table person (name string,age int,sex string) stored parquet location '/sparksqlouput/person/'; ok time taken: 0.174 seconds hive> select * person     > ; ok time taken: 0.125 seconds

but while run above select query no rows returned. kindly on this.

in general, hive sql statement 'select * <table>' locates table directory table data exist , dumps file contents hdfs directory.

in case select * not working means location not correct.

please note, in scala last statement contains save("sparksqloutput/person"), "sparksqloutput/person" relative path , expand "/user/<logged in username>/sparksqloutput/person" (i.e. "/user/cloudera/sparksqloutput/person").

hence while creating hive table should use "/user/cloudera/sparksqloutput/person" instead of "/sparksqloutput/person". practically "/sparksqloutput/person" not exist , hence did not output in select * person.


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more