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https://issues.apache.org/jira/browse/HADOOP-14521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16080574#comment-16080574
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Rushabh S Shah commented on HADOOP-14521:
-----------------------------------------
bq. I tried to ran TestAclsEndToEnd before and after applying this patch on
branch-2.8. It was passing before, failing after.
HADOOP-14563 fixed the failing test issue.
We deployed this change internally in our cluster and found out the client is
not retrying on {{addDelegationTokens}} call.
The reason is following piece of code.
{code:title=KMSClientProvider.java|borderStyle=solid}
@Override
public Token<?>[] addDelegationTokens(final String renewer,
Credentials credentials) throws IOException {
....
} catch (Exception e) {
throw new IOException(e); ---> Catching any Exception and throwing
IOException.
}
}
return tokens;
}
{code}
All the other calls checks whether the exception is {{IOException}} then
rethrow IOException otherwise wrap the actual exception in IOException and
rethrow that.
Will put up a new patch including this fix.
> KMS client needs retry logic
> ----------------------------
>
> Key: HADOOP-14521
> URL: https://issues.apache.org/jira/browse/HADOOP-14521
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 2.6.0
> Reporter: Rushabh S Shah
> Assignee: Rushabh S Shah
> Attachments: HADOOP-14521.09.patch, HDFS-11804-branch-2.8.patch,
> HDFS-11804-trunk-1.patch, HDFS-11804-trunk-2.patch, HDFS-11804-trunk-3.patch,
> HDFS-11804-trunk-4.patch, HDFS-11804-trunk-5.patch, HDFS-11804-trunk-6.patch,
> HDFS-11804-trunk-7.patch, HDFS-11804-trunk-8.patch, HDFS-11804-trunk.patch
>
>
> The kms client appears to have no retry logic – at all. It's completely
> decoupled from the ipc retry logic. This has major impacts if the KMS is
> unreachable for any reason, including but not limited to network connection
> issues, timeouts, the +restart during an upgrade+.
> This has some major ramifications:
> # Jobs may fail to submit, although oozie resubmit logic should mask it
> # Non-oozie launchers may experience higher rates if they do not already have
> retry logic.
> # Tasks reading EZ files will fail, probably be masked by framework reattempts
> # EZ file creation fails after creating a 0-length file – client receives
> EDEK in the create response, then fails when decrypting the EDEK
> # Bulk hadoop fs copies, and maybe distcp, will prematurely fail
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