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https://issues.apache.org/jira/browse/IMPALA-7290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891511#comment-16891511
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Tim Armstrong commented on IMPALA-7290:
---------------------------------------

[~arodoni_cloudera] the user-facing differences were kept as minimal as 
possible. The display rounding for floating point numbers may be slightly 
different, e.g. 8.071999999999999 vs 8.072 - the underlying value is the same 
but they're displayed differently.

It does fix a user-facing bug with handling of tab characters: 
https://issues.apache.org/jira/browse/IMPALA-1840

One minor difference in behaviour that could have consequences on some 
deployments, is that impala-shell is now connecting to the HS2 endpoint that's 
shared with more services, so you could exhaust fe_service_threads sooner. Not 
sure if that's an important enough issue to document.

One caveat that's worth documenting is that you can't connect to the HS2 
interface of older versions of Impala, because the impala-shell HS2 support 
depends on some extensions that were only added to this version.

> Move impala-shell to use HS2
> ----------------------------
>
>                 Key: IMPALA-7290
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7290
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Clients
>            Reporter: Tim Armstrong
>            Assignee: Tim Armstrong
>            Priority: Major
>              Labels: maintainability, shell
>             Fix For: Impala 3.3.0
>
>
> Most clients have moved to the HS2 interface. impala-shell is one of the 
> laggards. We should switch impala-shell to use the newer and more standard 
> interface.



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