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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14621) S3A client raising ConnectionPoolTimeoutException
Date Fri, 24 Nov 2017 17:29:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16265452#comment-16265452
] 

Steve Loughran commented on HADOOP-14621:
-----------------------------------------

This is possibly now remapped to ConnectionTimeoutException and so retried...we'd need to
experiment

ConnectionPoolTimeoutException is a sign of a serious problem, as it can be raised if the
pool of http threads has been used up by files not being closed in user code (SPARK-22526),
elsewhere (HIVE-13216). At the same time, completely spurious if it is raised early and often.

Proposed
# Make sure translation preserves it as its own exception (interruptedIOE with text)
# add commentary in troubleshooting doc
# review timeout value  and pool size, consider recommending values (2 per CPU?)
# could we make queue size a gauge in metrics ?
# have a test which creates a very small pool and timeout and triggers a failure (GET on small
file and read() one byte should be enough to use up a connection.

Look @ other object store code and see if the same policy applies

> S3A client raising ConnectionPoolTimeoutException
> -------------------------------------------------
>
>                 Key: HADOOP-14621
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14621
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3, test
>    Affects Versions: 3.0.0-beta1
>         Environment: Home network with 2+ other users on high bandwidth activities
>            Reporter: Steve Loughran
>            Priority: Minor
>
> Parallel test with threads = 12 triggering connection pool timeout. Hypothesis? Congested
network triggering pool timeout.
> Fix? For tests, could increase pool size
> For retry logic, this should be considered retriable, even on idempotent calls (as its
a failure to acquire a connection



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