Re: How to implement top() and filter() on object List for JavaRDD
_sorted_users.first()
>>>>
>>>> 2015-07-07 16:54 GMT+02:00 Hafsa Asif [via Apache Spark User List] <[hidden
>>>> email] <http:///user/SendEmail.jtp?type=node&node=23696&i=2>>:
>>>>
>>>>> Rusty,
>>>>>
>>>>> I am very thankful for your help. Actually, I am facing difficulty in
>>>>> objects. My plan is that, I have an object list containing list of User
>>>>> objects. After parallelizing it through spark context, I apply comparator
>>>>> on user.getUserName(). As usernames are sorted, their related user object
>>>>> are sorted according to user names.
>>>>> In the end when I apply top, I get the whole object of user .
>>>>>
>>>>> Some like this:
>>>>>
>>>>> public static Comparator UserComparator
>>>>> = new Comparator() {
>>>>>
>>>>> public int compare(User usr1, User usr2) {
>>>>> String userName1 = usr1.getUserName().toUpperCase();
>>>>> String userName2 = usr1.getUserName().toUpperCase();
>>>>>
>>>>> //ascending order
>>>>> return userName1.compareTo(userName2);
>>>>>
>>>>> //descending order
>>>>> //return fruitName2.compareTo(fruitName1);
>>>>> }
>>>>>
>>>>> };
>>>>>
>>>>> JavaRDD rdd = context.parallelize(usersList);
>>>>>
>>>>> 2015-07-07 16:05 GMT+02:00 rusty [via Apache Spark User List] <[hidden
>>>>> email] <http:///user/SendEmail.jtp?type=node&node=23688&i=0>>:
>>>>>
>>>>>> JavaRDD lines2 = ctx.parallelize(Arrays.asList("3", "6", "2",
>>>>>> "5", "8", "6", "7"));
>>>>>> List top =lines2.top(7, new
>>>>>> CustomComaprator());
>>>>>> for (String integer : top) {
>>>>>> System.out.println(integer);
>>>>>> }
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> class CustomComaprator implements Serializable, Comparator {
>>>>>> /**
>>>>>> *
>>>>>> */
>>>>>> public CustomComaprator() {
>>>>>> // TODO Auto-generated constructor stub
>>>>>>
>>>>>> }
>>>>>>
>>>>>> private static final long serialVersionUID =
>>>>>> 2004092520677431781L;
>>>>>>
>>>>>> @Override
>>>>>> public int compare(T o11, T o12) {
>>>>>> int o1 = Integer.parseInt(String.valueOf(o11));
>>>>>> int o2 = Integer.parseInt(String.valueOf(o12));
>>>>>>
>>>>>> return o1 > o2 ? 1 : o1 == o2 ? 0 : -1;
>>>>>> }
>>>>>>
>>>>>> }
>>>>>>
>>>>>>
>>>>>> --
>>>>>> If you reply to this email, your message will be added to the
>>>>>> discussion below:
>>>>>>
>>>>>> http://apache-spark-user-list.1001560.n3.nabble.com/How-to-implement-top-and-filter-on-object-List-for-JavaRDD-tp23669p23684.html
>>>>>> To unsubscribe from How to implement top() and filter() on object
>>>>>> List for JavaRDD, click here.
>>>>>> NAML
>>>>>> <http://apache-spark-user-list.1001560.n3.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> ----------
>>>>> If you reply to this email, your message will be added to the
>>>>> discussion below:
>>>>>
>>>>> http://apache
Re: How to implement top() and filter() on object List for JavaRDD
String userName2 = usr1.getUserName().toUpperCase();
>>>>
>>>> //ascending order
>>>> return userName1.compareTo(userName2);
>>>>
>>>> //descending order
>>>> //return fruitName2.compareTo(fruitName1);
>>>> }
>>>>
>>>> };
>>>>
>>>> JavaRDD rdd = context.parallelize(usersList);
>>>>
>>>> 2015-07-07 16:05 GMT+02:00 rusty [via Apache Spark User List] <[hidden
>>>> email] <http:///user/SendEmail.jtp?type=node&node=23688&i=0>>:
>>>>
>>>>> JavaRDD lines2 = ctx.parallelize(Arrays.asList("3", "6", "2",
>>>>> "5", "8", "6", "7"));
>>>>> List top =lines2.top(7, new
>>>>> CustomComaprator());
>>>>> for (String integer : top) {
>>>>> System.out.println(integer);
>>>>> }
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> class CustomComaprator implements Serializable, Comparator {
>>>>> /**
>>>>> *
>>>>> */
>>>>> public CustomComaprator() {
>>>>> // TODO Auto-generated constructor stub
>>>>>
>>>>> }
>>>>>
>>>>> private static final long serialVersionUID =
>>>>> 2004092520677431781L;
>>>>>
>>>>> @Override
>>>>> public int compare(T o11, T o12) {
>>>>> int o1 = Integer.parseInt(String.valueOf(o11));
>>>>> int o2 = Integer.parseInt(String.valueOf(o12));
>>>>>
>>>>> return o1 > o2 ? 1 : o1 == o2 ? 0 : -1;
>>>>> }
>>>>>
>>>>> }
>>>>>
>>>>>
>>>>> --
>>>>> If you reply to this email, your message will be added to the
>>>>> discussion below:
>>>>>
>>>>> http://apache-spark-user-list.1001560.n3.nabble.com/How-to-implement-top-and-filter-on-object-List-for-JavaRDD-tp23669p23684.html
>>>>> To unsubscribe from How to implement top() and filter() on object
>>>>> List for JavaRDD, click here.
>>>>> NAML
>>>>> <http://apache-spark-user-list.1001560.n3.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
>>>>>
>>>>
>>>>
>>>>
>>>> --
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>>>> To unsubscribe from How to implement top() and filter() on object List
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>>>>
>>>
>>>
>>>
>>> --
>>> Bien cordialement,
>>>
>>>
>>> *-*
>>> *Brahim OUBRIK*
>>> *Elève-Ingénieur en Informatique à Polytech Paris Sud.*
>>> *Cell +33 0651137644 <%2B33%200651137644>*
>>>
>>>
>>> *---------------------------------*
>>>
>>
>>
>>
>> --
>> Bien cordialement,
>>
>>
>> *-*
>> *Brahim OUBRIK*
>> *Elève-Ingénieur en Informatique à Polytech Paris Sud.*
>> *Cell +33 0651137644 <%2B33%200651137644>*
>>
>>
>> *-*
>>
>
>
>
> --
> Bien cordialement,
>
>
> *-*
> *Brahim OUBRIK*
> *Elève-Ingénieur en Informatique à Polytech Paris Sud.*
> *Cell +33 0651137644 <%2B33%200651137644>*
>
>
> *-*
>
>
> --
> If you reply to this email, your message will be added to the discussion
> below:
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Re: How to implement top() and filter() on object List for JavaRDD
Sorry ignore my last reply.
Rusty,
I am very thankful for your help. Actually, I am facing difficulty in
objects. My plan is that, I have an object list containing list of User
objects. After parallelizing it through spark context, I apply comparator
on user.getUserName(). As usernames are sorted, their related user object
are sorted according to user names.
In the end when I apply top, I get the whole object of user .
Some like this:
public static Comparator UserComparator
= new Comparator() {
public int compare(User usr1, User usr2) {
String userName1 = usr1.getUserName().toUpperCase();
String userName2 = usr1.getUserName().toUpperCase();
//ascending order
return userName1.compareTo(userName2);
//descending order
//return fruitName2.compareTo(fruitName1);
}
};
JavaRDD rdd = context.parallelize(usersList);
List top =rdd.top(1, UserComparator);// but it is giving me
serialization issues.
Can you guide me that how can I sort out this issue?
I also applied your code, it runs fine but I want it with object (You know
Object gives me tough time).
Best
Hafsa
2015-07-07 16:54 GMT+02:00 Hafsa Asif :
> Rusty,
>
> I am very thankful for your help. Actually, I am facing difficulty in
> objects. My plan is that, I have an object list containing list of User
> objects. After parallelizing it through spark context, I apply comparator
> on user.getUserName(). As usernames are sorted, their related user object
> are sorted according to user names.
> In the end when I apply top, I get the whole object of user .
>
> Some like this:
>
> public static Comparator UserComparator
> = new Comparator() {
>
> public int compare(User usr1, User usr2) {
> String userName1 = usr1.getUserName().toUpperCase();
> String userName2 = usr1.getUserName().toUpperCase();
>
> //ascending order
> return userName1.compareTo(userName2);
>
> //descending order
> //return fruitName2.compareTo(fruitName1);
> }
>
> };
>
> JavaRDD rdd = context.parallelize(usersList);
>
> 2015-07-07 16:05 GMT+02:00 rusty [via Apache Spark User List] <[hidden
> email] <http:///user/SendEmail.jtp?type=node&node=23688&i=0>>:
>
>> JavaRDD lines2 = ctx.parallelize(Arrays.asList("3", "6", "2",
>> "5", "8", "6", "7"));
>> List top =lines2.top(7, new
>> CustomComaprator());
>> for (String integer : top) {
>> System.out.println(integer);
>> }
>>
>>
>>
>>
>> class CustomComaprator implements Serializable, Comparator {
>> /**
>> *
>> */
>> public CustomComaprator() {
>> // TODO Auto-generated constructor stub
>>
>> }
>>
>> private static final long serialVersionUID =
>> 2004092520677431781L;
>>
>> @Override
>> public int compare(T o11, T o12) {
>> int o1 = Integer.parseInt(String.valueOf(o11));
>> int o2 = Integer.parseInt(String.valueOf(o12));
>>
>> return o1 > o2 ? 1 : o1 == o2 ? 0 : -1;
>> }
>>
>> }
>>
>>
>> --
>> If you reply to this email, your message will be added to the
>> discussion below:
>>
>> http://apache-spark-user-list.1001560.n3.nabble.com/How-to-implement-top-and-filter-on-object-List-for-JavaRDD-tp23669p23684.html
>> To unsubscribe from How to implement top() and filter() on object List
>> for JavaRDD, click here.
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>
>
> --
> View this message in context: Re: How to implement top() and filter() on
> object List for JavaRDD
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>
> Sent from the Apache Spark User List mailing list archive
> <http://apache-spark-user-list.1001560.n3.nabble.com/> at Nabble.com.
>
Re: How to implement top() and filter() on object List for JavaRDD
Rusty,
I am very thankful for your help. Actually, I am facing difficulty in
objects. My plan is that, I have an object list containing list of User
objects. After parallelizing it through spark context, I apply comparator
on user.getUserName(). As usernames are sorted, their related user object
are sorted according to user names.
In the end when I apply top, I get the whole object of user .
Some like this:
public static Comparator UserComparator
= new Comparator() {
public int compare(User usr1, User usr2) {
String userName1 = usr1.getUserName().toUpperCase();
String userName2 = usr1.getUserName().toUpperCase();
//ascending order
return userName1.compareTo(userName2);
//descending order
//return fruitName2.compareTo(fruitName1);
}
};
JavaRDD rdd = context.parallelize(usersList);
2015-07-07 16:05 GMT+02:00 rusty [via Apache Spark User List] <
ml-node+s1001560n23684...@n3.nabble.com>:
> JavaRDD lines2 = ctx.parallelize(Arrays.asList("3", "6", "2",
> "5", "8", "6", "7"));
> List top =lines2.top(7, new
> CustomComaprator());
> for (String integer : top) {
> System.out.println(integer);
> }
>
>
>
>
> class CustomComaprator implements Serializable, Comparator {
> /**
> *
> */
> public CustomComaprator() {
> // TODO Auto-generated constructor stub
>
> }
>
> private static final long serialVersionUID = 2004092520677431781L;
>
> @Override
> public int compare(T o11, T o12) {
> int o1 = Integer.parseInt(String.valueOf(o11));
> int o2 = Integer.parseInt(String.valueOf(o12));
>
> return o1 > o2 ? 1 : o1 == o2 ? 0 : -1;
> }
>
> }
>
>
> ------------------
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Re: How to implement top() and filter() on object List for JavaRDD
Here's a simplified example:
SparkConf conf = new SparkConf().setAppName(
"Sigmoid").setMaster("local");
JavaSparkContext sc = new JavaSparkContext(conf);
List user = new ArrayList();
user.add("Jack");
user.add("Jill");
user.add("Jack");
user.add("Bob");
JavaRDD userRDD = sc.parallelize(user);
//Now Lets filter all Jacks!
JavaRDD jackRDD = userRDD
*.filter(new Function() {*
*public Boolean call(String v1) throws Exception {*
*return v1.equals("Jack");*
*}*
*}*);
//Lets print all jacks!
for (String s : jackRDD.collect()) {
System.out.println(s);
}
Thanks
Best Regards
On Tue, Jul 7, 2015 at 5:39 PM, Hafsa Asif
wrote:
> I have also tried this stupid code snippet, only thinking that it may even
> compile code
> Function1 FILTER_USER = new AbstractFunction1 >()
> {
> public Object apply(User user){
> return user;
> }
> };
>
>
> FILTER_USER is fine but cannot be applied to the following two options but
> no results:
> User[] filterUsr =
> (User[])rdd.rdd().retag(User.class).filter(FILTER_USER);
>
> User userFilter = (User) rdd.rdd().filter(FILTER_USER);
>
> Giving issue: Inconertable types
> I really need proper code related to this issue.
>
>
>
>
> --
> View this message in context:
> http://apache-spark-user-list.1001560.n3.nabble.com/How-to-implement-top-and-filter-on-object-List-for-JavaRDD-tp23669p23677.html
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>
Re: How to implement top() and filter() on object List for JavaRDD
I would suggest you take alook to DataFrames. Also, I do not think you
should implement comparators for user class as a whole, rather you should
get the attribute to sort/compar on and delete sorting to data type of
inherent attribute. Eg. sorting can be done by name and if so, it should be
string sorting. In that case, you can create another KeyValue RDD whr key
is the "chosen" attribute and value is user object and do a sortByKey.
On Tue, Jul 7, 2015 at 10:09 PM, Hafsa Asif
wrote:
> I have also tried this stupid code snippet, only thinking that it may even
> compile code
> Function1 FILTER_USER = new AbstractFunction1 >()
> {
> public Object apply(User user){
> return user;
> }
> };
>
>
> FILTER_USER is fine but cannot be applied to the following two options but
> no results:
> User[] filterUsr =
> (User[])rdd.rdd().retag(User.class).filter(FILTER_USER);
>
> User userFilter = (User) rdd.rdd().filter(FILTER_USER);
>
> Giving issue: Inconertable types
> I really need proper code related to this issue.
>
>
>
>
> --
> View this message in context:
> http://apache-spark-user-list.1001560.n3.nabble.com/How-to-implement-top-and-filter-on-object-List-for-JavaRDD-tp23669p23677.html
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>
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Best Regards,
Ayan Guha
Re: How to implement top() and filter() on object List for JavaRDD
I have also tried this stupid code snippet, only thinking that it may even
compile code
Function1 FILTER_USER = new AbstractFunction1()
{
public Object apply(User user){
return user;
}
};
FILTER_USER is fine but cannot be applied to the following two options but
no results:
User[] filterUsr =
(User[])rdd.rdd().retag(User.class).filter(FILTER_USER);
User userFilter = (User) rdd.rdd().filter(FILTER_USER);
Giving issue: Inconertable types
I really need proper code related to this issue.
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Re: How to implement top() and filter() on object List for JavaRDD
Thank u for your quick response. But, I tried this and get the error as shown in pic error.jpg <http://apache-spark-user-list.1001560.n3.nabble.com/file/n23676/error.jpg> -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/How-to-implement-top-and-filter-on-object-List-for-JavaRDD-tp23669p23676.html Sent from the Apache Spark User List mailing list archive at Nabble.com. - To unsubscribe, e-mail: user-unsubscr...@spark.apache.org For additional commands, e-mail: user-h...@spark.apache.org
How to implement top() and filter() on object List for JavaRDD
Hi,
I have an object list of Users and I want to implement top() and filter()
methods on the object list. Let me explain you the whole scenario:
1. I have User object list named "usersList". I fill it during record set.
User user = new User();
user.setUserName(record.getValue("username").toString());
user.setPassword(record.getValue("password").toString());
usersList.add(user);
2. I successfully implement first() and take() methods like this, they are
giving results:
JavaRDD rdd = context.parallelize(usersList);
/*Getting First User*/
User firstUsr = (User) rdd.rdd().first();
System.out.println("First User: "+firstUsr.getUserName());
/*Getting Take 2 Users*/
User[] takeUsr =
(User[])rdd.rdd().retag(User.class).take(2);
for(int ctusr=0 ; ctusr ord). I donot understand how to
implement Ordering. I tried two possibilities:
(i) User[] topUsr = (User[])rdd.rdd().retag(User.class).top(1, null);
(ii) User[] topUsr = (User[])rdd.rdd().retag(User.class).top(1, new
Ordering() {
@Override
public Some tryCompare(User user, User t1) {
return null;
}
@Override
public int compare(User usr1, User usr2) {
usr1 = new User();
usr2 = new User();
for(int u=0 ; u < usersList.size(); u++){
usr1 = (User)usersList.get(u);
usr2 = (User)usersList.get(u);
}
String userName1 = usr1.getUserName();
String userName2 = usr2.getUserName();
System.out.println("userName1: "+userName1);
//ascending order
return userName1.compareTo(userName2);
//descending order
//return userName2.compareTo(userName1);
}
@Override
public boolean lteq(User user, User t1) {
return false;
}
@Override
public boolean gteq(User user, User t1) {
return false;
}
@Override
public boolean lt(User user, User t1) {
return false;
}
@Override
public boolean gt(User user, User t1) {
return false;
}
@Override
public boolean equiv(User user, User t1) {
return false;
}
@Override
public User max(User user, User t1) {
return null;
}
@Override
public User min(User user, User t1) {
return null;
}
@Override
public Ordering reverse() {
return null;
}
@Override
public Ordering on(Function1 function1)
{
return null;
}
@Override
public Ops mkOrderingOps(User user) {
return null;
}
}
);
BOTH ARE GIVING ME NULLPOINTER EXCEPTION. Kindly guide me how to properly
implement it?
4. I also want to implement the filter() in same way.
User[] filterUsr =
(User[])rdd.rdd().retag(User.class).filter(Function1);
but could not write Function1 for it. I suppose that filter out the user
whose name is "Bob". How it can be possible by using object list and User
objects? Can you give me code sample for Function1?
I really appreciate your help and guidance.
Thanks,
Hafsa
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