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From "Hive QA (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21508) ClassCastException when initializing HiveMetaStoreClient on JDK10 or newer
Date Thu, 12 Sep 2019 17:00:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928731#comment-16928731
] 

Hive QA commented on HIVE-21508:
--------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m 17s{color} | {color:red}
/data/hiveptest/logs/PreCommit-HIVE-Build-18565/patches/PreCommit-HIVE-Build-18565.patch does
not apply to master. Rebase required? Wrong Branch? See http://cwiki.apache.org/confluence/display/Hive/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-18565/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> ClassCastException when initializing HiveMetaStoreClient on JDK10 or newer
> --------------------------------------------------------------------------
>
>                 Key: HIVE-21508
>                 URL: https://issues.apache.org/jira/browse/HIVE-21508
>             Project: Hive
>          Issue Type: Bug
>          Components: Clients
>    Affects Versions: 3.2.0, 2.3.4
>            Reporter: Adar Dembo
>            Assignee: Ana Jalba
>            Priority: Major
>             Fix For: 2.4.0, 4.0.0, 2.3.7
>
>         Attachments: HIVE-21508.1.patch, HIVE-21508.2.branch-2.3.patch, HIVE-21508.3.branch-2.patch,
HIVE-21508.4.branch-3.1.patch, HIVE-21508.patch
>
>
> There's this block of code in {{HiveMetaStoreClient:resolveUris}} (called from the constructor)
on master:
> {noformat}
>   private URI metastoreUris[];
>   ...
>       if (MetastoreConf.getVar(conf, ConfVars.THRIFT_URI_SELECTION).equalsIgnoreCase("RANDOM"))
{
>         List uriList = Arrays.asList(metastoreUris);
>         Collections.shuffle(uriList);
>         metastoreUris = (URI[]) uriList.toArray();
>       }
> {noformat}
> The cast to {{URI[]}} throws a {{ClassCastException}} beginning with JDK 10, possibly
with JDK 9 as well. Note that {{THRIFT_URI_SELECTION}} defaults to {{RANDOM}} so this should
affect anyone who creates a {{HiveMetaStoreClient}}. On master this can be overridden with
{{SEQUENTIAL}} to avoid the broken case; I'm working against 2.3.4 where there's no such workaround.
> [Here's|https://stackoverflow.com/questions/51372788/array-cast-java-8-vs-java-9] a StackOverflow
post that explains the issue in more detail. Interestingly, the author described the issue
in the context of the HMS; not sure why there was no follow up with a Hive bug report.



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