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https://issues.apache.org/jira/browse/HADOOP-15662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16739942#comment-16739942
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Thomas Marquardt commented on HADOOP-15662:
-------------------------------------------
Some comments on the 002 patch:
AbfsRestOperation.java:
L173: You have {{LOG.warn(String.format("{color:#FF0000}Can not{color} reach
host: %s, retrying to {color:#FF0000}solve{color} the host name...",
ex.getMessage()));}}
It is important to include the host name in this message, so that the user
can potentially identify the typo in the host name. Also, note that the word
{color:#FF0000}cannot{color} is written as a single word, and we are retrying
to {color:#FF0000}resolve{color} the host name, not solve the host name. I
recommend replacing L173 with:
{{LOG.warn(String.format("Unknown host name '%s'. Retrying to resolve the
host name...", httpOperation.getUrl().getHost()));}}
L174: We should not use else if here. Instead it should be if. I mean, we
want to log the warning when there is a host name exception, but we should not
change the existing debug logging. The existing debug logging will trace the
exception. They are separate things.
> ABFS: Better exception handling of DNS errors
> ---------------------------------------------
>
> Key: HADOOP-15662
> URL: https://issues.apache.org/jira/browse/HADOOP-15662
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Reporter: Thomas Marquardt
> Assignee: Da Zhou
> Priority: Major
> Fix For: 3.2.1
>
> Attachments: HADOOP-15662-001.patch, HADOOP-15662-002.patch
>
>
> DNS errors are common during testing due to typos or misconfiguration. They
> can also occur in production, as some transient DNS issues occur from time to
> time.
> 1) Let's investigate if we can distinguish between the two and fail fast for
> the test issues, but continue to have retry logic for the transient DNS
> issues in production.
> 2) Let's improve the error handling of DNS failures, so the user has an
> actionable error message.
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