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https://issues.apache.org/jira/browse/IMPALA-9367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032764#comment-17032764
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Tim Armstrong commented on IMPALA-9367:
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This may not actually be possible, because the Java side of Impala shares a
ticket cache with the C++ side, but it doesn't look like the Java
implementation of kerberos supports the same in-memory credential cache.
> Allow specifying MEMORY kerberos credential cache
> -------------------------------------------------
>
> Key: IMPALA-9367
> URL: https://issues.apache.org/jira/browse/IMPALA-9367
> Project: IMPALA
> Issue Type: Improvement
> Components: Security
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Labels: kerberos
>
> Currently --krb5_ccname defaults to "/tmp/krb5cc_impala_internal" and
> requires that the argument be an absolute path.
> Kudu actually defaults to "MEMORY:kudu" as its credential cache, which may
> have some advantages, e.g. it doesn't depend on the filesystem.
> It would be reasonable to allow setting the credential cache type to MEMORY.
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