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https://issues.apache.org/jira/browse/HDFS-5939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13908730#comment-13908730
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Tsz Wo (Nicholas), SZE commented on HDFS-5939:
----------------------------------------------
{code}
+ } catch (InvalidTopologyException te) {
+ throw new IOException("Failed to find datanode, suggest to check cluster
health.");
+ }
{code}
Let's set the cause of the IOException to te as below. Otherwise, the message
in te won't be shown anywhere.
{code}
+ } catch (InvalidTopologyException te) {
+ throw new IOException("Failed to find datanode, suggest to check cluster
health.", te);
+ }
{code}
BTW, do you mean to name the InvalidTopologyException variable ite?
> WebHdfs returns misleading error code and logs nothing if trying to create a
> file with no DNs in cluster
> --------------------------------------------------------------------------------------------------------
>
> Key: HDFS-5939
> URL: https://issues.apache.org/jira/browse/HDFS-5939
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.3.0
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
> Attachments: HDFS-5939.001.patch, HDFS-5939.002.patch,
> HDFS-5939.003.patch
>
>
> When trying to access hdfs via webhdfs, and when datanode is dead, user will
> see an exception below without any clue that it's caused by dead datanode:
> $ curl -i -X PUT
> ".../webhdfs/v1/t1?op=CREATE&user.name=<userName>&overwrite=false"
> ...
> {"RemoteException":{"exception":"IllegalArgumentException","javaClassName":"java.lang.IllegalArgumentException","message":"n
> must be positive"}}
> Need to fix the report to give user hint about dead datanode.
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