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From Jianfeng Jia <jianfeng....@gmail.com>
Subject Re: Socket feed questions
Date Mon, 02 Nov 2015 17:25:28 GMT
Great, here is the cc log:

Thank you!

> On Nov 2, 2015, at 5:54 AM, Raman Grover <ramangrover29@gmail.com> wrote:
> 
> Hi,
> 
> I should be able to look at this one in a few days when I return and resume
> work (I am currently on a vacation till 5th Nov).
> 
> However, the exception suggests that building the secondary feed pipeline
> encountered an exception. Can you share the logs so that I can get a better
> understanding of the sequence of steps that happened as your statement
> executed.
> 
> I have intermittent access to net, but should be able to revert with some
> delays.
> On Nov 2, 2015 2:32 AM, "Jianfeng Jia" <jianfeng.jia@gmail.com <mailto:jianfeng.jia@gmail.com>>
wrote:
> 
>> I’ve tried the “apply AQLfunction” idea, but got an NullPointException:
>> java.lang.NullPointerException
>>        at
>> org.apache.asterix.aql.translator.AqlTranslator.getFeedJointKey(AqlTranslator.java:2268)
>>        at
>> org.apache.asterix.aql.translator.AqlTranslator.getFeedConnectionRequest(AqlTranslator.java:2214)
>>        at
>> org.apache.asterix.aql.translator.AqlTranslator.handleConnectFeedStatement(AqlTranslator.java:2130)
>>        at
>> org.apache.asterix.aql.translator.AqlTranslator.compileAndExecute(AqlTranslator.java:362)
>>        at
>> org.apache.asterix.api.http.servlet.APIServlet.doPost(APIServlet.java:114)
>>        at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
>>        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
>>        at
>> org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:546)
>>        at
>> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:483)
>>        at
>> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
>>        at
>> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:970)
>>        at
>> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:411)
>>        at
>> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192)
>>        at
>> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:904)
>>        at
>> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
>>        at
>> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
>>        at org.eclipse.jetty.server.Server.handle(Server.java:347)
>>        at
>> org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:439)
>>        at
>> org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:924)
>>        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:781)
>>        at
>> org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:220)
>>        at
>> org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:43)
>>        at
>> org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:545)
>>        at
>> org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:43)
>>        at
>> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:529)
>>        at java.lang.Thread.run(Thread.java:745)
>> 
>> The ddl that I was using is here:
>> https://gist.githubusercontent.com/JavierJia/ca596df82ffdd456001f/raw/ea86f9ad1531a68c3ecf9036ef5b69976893149d/feed-ddl.aql
>> <
>> https://gist.githubusercontent.com/JavierJia/ca596df82ffdd456001f/raw/ea86f9ad1531a68c3ecf9036ef5b69976893149d/feed-ddl.aql
<https://gist.githubusercontent.com/JavierJia/ca596df82ffdd456001f/raw/ea86f9ad1531a68c3ecf9036ef5b69976893149d/feed-ddl.aql>
>>> 
>> Anyone has any idea? Thank you!
>> 
>>> On Oct 30, 2015, at 12:30 AM, Heri Ramampiaro <heriram@gmail.com> wrote:
>>> 
>>> Although I haven’t tested this (I have mostly used & created java-based
>> UDFs),
>>> one can execute AQL calls from within a UDF. Feeds allows functions to
>>> execute arbitrary AQL statements (DDL, DMLs etc). I.e., I believe what
>>> you are trying to do is possible.
>>> 
>>> For example you could do:
>>> (Given that you have a rec. type called Tweet, and a dataset
>> ProcessedTweets
>>> 
>>> create feed CoordTwitterFeed if not exists
>>> using “push_twitter" (("type-name"="Tweet”))
>>>      apply function find-intersection;
>>> 
>>> (Here "find-intersection” is an AQL function that does the step
>> specified under 2)).
>>> 
>>> To do nr. 3 the easiest way is to have a modified version of the
>> “hashTag”
>>> (let’s call this “tweetlocator”).  Java-based UDF (see my previous
>> message with the
>>> TweetLib example). You can then connect this  as a secondary feed,
>> connected to
>>> “CoordTwitterFeed”.
>>> 
>>> E.g.:
>>> create secondary feed ProcessedTwitterFeed from feed CoordTwitterFeed
>>> apply function “tweelib#tweetlocator";
>>> 
>>> Thereafter you can connect the feeds to appropriate datasets.
>>> 
>>> (Since the find-intersection is an AQL function, you can also call
>> “tweelib#tweetlocator”
>>> inside this function).
>>> 
>>> Best,
>>> -heri
>>> 
>>>> On Oct 30, 2015, at 12:18 AM, Young-Seok Kim <kisskys@gmail.com> wrote:
>>>> 
>>>> I'm not sure whether the following UDF is possible or not, but
>> hopefully it
>>>> is.
>>>> What we're trying to do is to have the following UDF.
>>>> 
>>>> The UDF
>>>> 1) accepts an incoming tweet record through a feed job as an input and
>> then
>>>> 2) takes a field, more specifically, coordinate field value from the
>> tweet
>>>> record and sends a spatial-intersect query using the coordinate in
>> order to
>>>> find out the corresponding county of the coordinates (we have created
>>>> AsterixDB instance which stores US county shapes records into a dataset
>> and
>>>> created R-tree index on the polygon field of it, so the query will
>> return
>>>> the county effectively using the R-tree index)
>>>> 3) creates a new tweet record consisting of the original record's
>> fields +
>>>> the returned county value
>>>> 4) ingests to a tweet dataset in the AsterixDB instance.
>>>> 
>>>> Can we have such an UDF?
>>>> 
>>>> Best,
>>>> Young-Seok
>>>> 
>>>> 
>>>> On Thu, Oct 29, 2015 at 3:53 PM, Heri Ramampiaro <heriram@gmail.com>
>> wrote:
>>>> 
>>>>>> 
>>>>>> 2. Can we use AQL function in those kind of feed UDFs?
>>>>> 
>>>>> Can you give an example of what you are trying to do?
>>>>> I.e do you want to run an AQL inside a UDF or use an AQL function as
a
>>>>> UDF connected to a running feed?
>>>>> 
>>>>> -heri
>>> 
>> 
>> 
>> 
>> Best,
>> 
>> Jianfeng Jia
>> PhD Candidate of Computer Science
>> University of California, Irvine



Best,

Jianfeng Jia
PhD Candidate of Computer Science
University of California, Irvine


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