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From "MykhailoVlakh (JIRA)" <>
Subject [jira] [Commented] (CAMEL-11697) S3 Consumer: If maxMessagesPerPoll is greater than 50 consumer fails to poll objects from bucket
Date Wed, 23 Aug 2017 13:44:00 GMT


MykhailoVlakh commented on CAMEL-11697:

Hello [~ancosen], thank you for a quick response. 
I am not sure if this is the best way to fix this issue since user of the s3 consumer in this
case should know how many connections the consumer needs. And since it is not obvious that
all s3 objects will be opened simultaneously user will most likely ignore that setting until
he/she gets a fault in run time.
I think the consumer should calculate a default value for this setting based on the value
of the maxMessagesPerPoll  property to make sure that it always has enough connections unless
user decided to use custom value. Do you agree?

Also I am looking at the s3 consumer code and I do not understand why the consumer opens all
the objects right away. Why cannot it open one object at a time when it actually initiates
an exchange for it? This seems more efficient and requires only 1 connection at a time. What
do you think?

> S3 Consumer: If maxMessagesPerPoll is greater than 50 consumer fails to poll objects
from bucket
> ------------------------------------------------------------------------------------------------
>                 Key: CAMEL-11697
>                 URL:
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-aws
>    Affects Versions: 2.14.3, 2.19.2
>            Reporter: MykhailoVlakh
>            Assignee: Andrea Cosentino
>             Fix For: 2.20.0
> It is possible to configure S3 consumer to process several s3 objects in a single poll
using the maxMessagesPerPoll property. 
> If this property contains a small number, less than 50, everything works fine but if
user tries to consume more files then s3 consumer simply fails all the time. It cannot poll
files because there are not enough HTTP connections to open streams for all the requested
files at once. The exception looks like this:
> {code}
> com.amazonaws.AmazonClientException: Unable to execute HTTP request: Timeout waiting
for connection from pool
> 	at com.amazonaws.http.AmazonHttpClient.executeHelper(
> 	at com.amazonaws.http.AmazonHttpClient.execute(
> 	at
> 	at
> 	at$201(
> 	at$S3DirectImpl.getObject(
> 	at
> 	at
> 	at
> 	at
> 	at
> 	at
> 	at org.apache.camel.impl.ScheduledPollConsumer.doRun(
> 	at
> 	at java.util.concurrent.Executors$
> 	at java.util.concurrent.FutureTask.runAndReset(
> 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(
> 	at java.util.concurrent.ScheduledThreadPoolExecutor$
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(
> 	at java.util.concurrent.ThreadPoolExecutor$
> 	at
> {code}
> The issue happens because by default AmazonS3Client uses HTTP client with limited number
of connections in the pool - 50. 
> Since S3 consumer provides a possibility to consume any number of s3 objects in a single
pool and because it is quite common case that someone needs to process 50 or more files in
a single pool I think s3 consumer should handle this case properly. It should automatically
change HTTP connections pool size to be able to handle requested number of objects. This can
be done like this:
> {code}
> ClientConfiguration s3Config = new ClientConfiguration();
> /*
> +20 we need to allocate a bit more to be sure that we always can do additional API calls
when we already hold maxMessagesPerPoll s3 object streams opened
> */
> s3Config.setMaxConnections(maxMessagesPerPoll + 20); 
> AmazonS3Client client = new AeAmazonS3Client(awsCreds, s3Config );
> {code}

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