[jira] [Created] (KYLIN-4500) Timeout waiting for connection from pool

["Gabor Arki (Jira)" <ji...@apache.org>]

Gabor Arki created KYLIN-4500:
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             Summary: Timeout waiting for connection from pool
                 Key: KYLIN-4500
                 URL: https://issues.apache.org/jira/browse/KYLIN-4500
             Project: Kylin
          Issue Type: Bug
            Reporter: Gabor Arki


h4. Environment
 * Kylin server 3.0.0
 * EMR 5.28

h4. Issue

After an extended uptime, both Kylin query server and jobs running on EMR stop working. The root cause is both cases is:

{{Caused by: java.io.IOException: com.amazon.ws.emr.hadoop.fs.shaded.com.amazonaws.SdkClientException: Unable to execute HTTP request: Timeout waiting for connection from pool}}
{{ at com.amazon.ws.emr.hadoop.fs.s3n2.S3NativeFileSystem2.getFileStatus(S3NativeFileSystem2.java:257) ~[emrfs-hadoop-assembly-2.37.0.jar:?]}}

{{Based on [https://aws.amazon.com/premiumsupport/knowledge-center/emr-timeout-connection-wait/] increasing the *fs.s3.maxConnections* setting to 10000 is just delaying the issue thus the underlying issue is likely a connection leak. It also indicates a leak that restarting the kylin service solves the problem.}}

{{A full stack trace from the QueryService is attached.}}

 



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