[
https://issues.apache.org/jira/browse/KNOX-2639?focusedWorklogId=630504&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-630504
]
ASF GitHub Bot logged work on KNOX-2639:
----------------------------------------
Author: ASF GitHub Bot
Created on: 28/Jul/21 13:18
Start Date: 28/Jul/21 13:18
Worklog Time Spent: 10m
Work Description: zeroflag opened a new pull request #475:
URL: https://github.com/apache/knox/pull/475
## What changes were proposed in this pull request?
Trying to get rid of build instability errors like this:
```
Error: Failed to execute goal on project gateway-test-release: Could not
resolve dependencies for project
org.apache.knox:gateway-test-release:pom:1.6.0-SNAPSHOT: Failed to collect
dependencies at org.eclipse.jetty:jetty-util-ajax:jar:9.4.34.v20201102: Failed
to read artifact descriptor for
org.eclipse.jetty:jetty-util-ajax:jar:9.4.34.v20201102:
Could not transfer artifact
org.eclipse.jetty:jetty-util-ajax:pom:9.4.34.v20201102 from/to central
(https://repo.maven.apache.org/maven2): transfer failed for
https://repo.maven.apache.org/maven2/org/eclipse/jetty/jetty-util-ajax/9.4.34.v20201102/jetty-util-ajax-9.4.34.v20201102.pom:
Connection timed out (Read failed) -> [Help 1]
```
There is a `maven.wagon.http.retryHandler.count` parameter but it doesn't do
anything by default because ConnectException is not retryable by default, so I
had to set maven.wagon.http.retryHandler.nonRetryableClasses as well.
This way I can see the retry related messages in the mvn outout.
Many sources recommened `-Dhttp.keepAlive=false` because keepAlive
connections are prone to be killed within docker for some reason.
## How was this patch tested?
1.) Enable maven wagon logging to see retries:
```
org.slf4j.simpleLogger.log.org.apache.maven.wagon.providers.http.httpclient=on
in
~/tools/apache-maven-3.8.1/conf/logging/simplelogger.properties
```
2.) Simulate Connection Timeout by setting `10.255.255.1
repo.maven.apache.org` in `/etc/hosts`
3.) Run maven command with retry and checked the output:
```
mvn -Dmaven.wagon.http.retryHandler.count=2
-Dmaven.wagon.http.retryHandler.class=default
-Dmaven.wagon.http.retryHandler.nonRetryableClasses=java.io.InterruptedIOException
-DskipTests -Dcheckstyle.skip=true -Dfindbugs.skip=true -Dpmd.skip=true
-Drat.skip -Ppackage clean install
```
Output:
```
Downloading from central:
https://repo.maven.apache.org/maven2/org/apache/velocity/velocity/1.5/velocity-1.5.pom
[INFO] I/O exception
(org.apache.maven.wagon.providers.http.httpclient.conn.HttpHostConnectException)
caught when processing request to {s}->https://repo.maven.apache.org:443:
Connect to repo.maven.apache.org:443 [repo.maven.apache.org/10.255.255.1]
failed: Operation timed out (Connection timed out)
[INFO] Retrying request to {s}->https://repo.maven.apache.org:443
[INFO] I/O exception
(org.apache.maven.wagon.providers.http.httpclient.conn.HttpHostConnectException)
caught when processing request to {s}->https://repo.maven.apache.org:443:
Connect to repo.maven.apache.org:443 [repo.maven.apache.org/10.255.255.1]
failed: Operation timed out (Connection timed out)
[INFO] Retrying request to {s}->https://repo.maven.apache.org:443
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 630504)
Remaining Estimate: 0h
Time Spent: 10m
> Build instability because maven artifact download failure
> ---------------------------------------------------------
>
> Key: KNOX-2639
> URL: https://issues.apache.org/jira/browse/KNOX-2639
> Project: Apache Knox
> Issue Type: Task
> Components: Build
> Reporter: Attila Magyar
> Assignee: Attila Magyar
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Travis often fails because of a maven dependency download issue:
> {code:java}
> Error: Failed to execute goal on project gateway-test-release: Could not
> resolve dependencies for project
> org.apache.knox:gateway-test-release:pom:1.6.0-SNAPSHOT: Failed to collect
> dependencies at org.eclipse.jetty:jetty-util-ajax:jar:9.4.34.v20201102:
> Failed to read artifact descriptor for
> org.eclipse.jetty:jetty-util-ajax:jar:9.4.34.v20201102: Could not transfer
> artifact org.eclipse.jetty:jetty-util-ajax:pom:9.4.34.v20201102 from/to
> central (https://repo.maven.apache.org/maven2): transfer failed for
> https://repo.maven.apache.org/maven2/org/eclipse/jetty/jetty-util-ajax/9.4.34.v20201102/jetty-util-ajax-9.4.34.v20201102.pom:
> Connection timed out (Read failed) -> [Help 1]
> {code}
> Let's try fixing this by adding some retry logic.
> {code:java}
> -Dmaven.wagon.http.retryHandler.count=5{code}
> If it doesn't work we might need to add some shell script to do the retry.
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