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Date: Fri, 5 Aug 2016 15:29:20 +0000 (UTC)
From: "Wail Alkowaileet (JIRA)" <jira@apache.org>
To: notifications@asterixdb.incubator.apache.org
Message-ID: <JIRA.12995223.1470406941000.235219.1470410960517@Atlassian.JIRA>
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Subject: [jira] [Comment Edited] (ASTERIXDB-1565) Twitter Feed not working
 properly after feed update
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archived-at: Fri, 05 Aug 2016 15:29:29 -0000


    [ https://issues.apache.org/jira/browse/ASTERIXDB-1565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15409583#comment-15409583 ] 

Wail Alkowaileet edited comment on ASTERIXDB-1565 at 8/5/16 3:28 PM:
---------------------------------------------------------------------

I found this bug as well.
It seems that there are some "race condition". I solved the problem by making the method start() synchronized in:
{noformat}
org.apache.asterix.external.dataflow.FeedRecordDataFlowController
{noformat}

It's probably not the best way to do it. But I needed to do a demo and that's the quickest solution.


was (Author: wyk):
I found this bug as well.
It seems that there are some "race condition". I solved the problem by making the method start() synchronized in:
{nofromat}
org.apache.asterix.external.dataflow.FeedRecordDataFlowController
{noformat}

It's probably not the best way to do it. But I needed to do a demo and that's the quickest solution.

> Twitter Feed not working properly after feed update
> ---------------------------------------------------
>
>                 Key: ASTERIXDB-1565
>                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1565
>             Project: Apache AsterixDB
>          Issue Type: Bug
>          Components: Feeds
>            Reporter: Xikui Wang
>
> I found the Twitter Feed is not working properly after the recent modifications to the feed part. Following exceptions is captured using the twitter feed example on our website.
> <quote>
> 2016-08-05 22:02:07,424 WARN  [pool-21-thread-1] dataflow.FeedRecordDataFlowController (FeedRecordDataFlowController.java:start(101)) - Failure while operating a feed source
> java.lang.IllegalMonitorStateException
> 	at java.lang.Object.wait(Native Method)
> 	at org.apache.asterix.external.dataflow.FeedRecordDataFlowController.start(FeedRecordDataFlowController.java:87)
> 	at org.apache.asterix.external.dataset.adapter.FeedAdapter.start(FeedAdapter.java:36)
> 	at org.apache.asterix.external.feed.runtime.AdapterExecutor.run(AdapterExecutor.java:57)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:745)
> 2016-08-05 22:02:07,425 ERROR [pool-21-thread-1] runtime.AdapterExecutor (AdapterExecutor.java:run(61)) - Exception during feed ingestion 
> org.apache.hyracks.api.exceptions.HyracksDataException: null
> 	at org.apache.asterix.external.dataflow.FeedRecordDataFlowController.start(FeedRecordDataFlowController.java:102)
> 	at org.apache.asterix.external.dataset.adapter.FeedAdapter.start(FeedAdapter.java:36)
> 	at org.apache.asterix.external.feed.runtime.AdapterExecutor.run(AdapterExecutor.java:57)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.IllegalMonitorStateException
> 	at java.lang.Object.wait(Native Method)
> 	at org.apache.asterix.external.dataflow.FeedRecordDataFlowController.start(FeedRecordDataFlowController.java:87)
> 	... 5 more
> org.apache.hyracks.api.exceptions.HyracksDataException: java.util.ConcurrentModificationException
> 	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:218)
> 	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.initialize(SuperActivityOperatorNodePushable.java:83)
> 	at org.apache.hyracks.control.nc.Task.run(Task.java:263)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
> 	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
> 	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
> 	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.runInParallel(SuperActivityOperatorNodePushable.java:212)
> 	... 5 more
> Caused by: java.util.ConcurrentModificationException
> 	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
> 	at java.util.ArrayList$Itr.next(ArrayList.java:851)
> 	at org.apache.asterix.external.feed.runtime.IngestionRuntime.terminate(IngestionRuntime.java:78)
> 	at org.apache.asterix.external.operators.FeedIntakeOperatorNodePushable.initialize(FeedIntakeOperatorNodePushable.java:107)
> 	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable.lambda$initialize$0(SuperActivityOperatorNodePushable.java:83)
> 	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:205)
> 	at org.apache.hyracks.api.rewriter.runtime.SuperActivityOperatorNodePushable$1.call(SuperActivityOperatorNodePushable.java:202)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> 	... 3 more
> 2016-08-05 22:02:07,438 INFO  [ActiveJobNotificationHandler] management.FeedEventsListener (FeedEventsListener.java:handleJobFinishEvent(132)) - Intake Job finished for feed intake JID:23
> 2016-08-05 22:02:07,439 INFO  [ActiveJobNotificationHandler] management.FeedEventsListener (FeedEventsListener.java:deregisterFeedIntakeJob(191)) - Deregistered feed intake job [JID:23]
> Aug 05, 2016 10:02:07 PM org.apache.hyracks.control.nc.Joblet close
> WARNING: Freeing leaked 16384 bytes
> 2016-08-05 22:02:07,445 INFO  [ActiveJobNotificationHandler] management.FeedEventsListener (FeedEventsListener.java:handleJobFinishEvent(126)) - Collect Job finished for  JID:24 [FEED_CONNECT]
> 2016-08-05 22:02:07,446 INFO  [ActiveJobNotificationHandler] management.FeedEventsListener (FeedEventsListener.java:handleFeedCollectJobFinishMessage(384)) - Subscription feeds.TwitterFeed(Feed)-->Tweets completed successfully. Removed subscription
> </quote>


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