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Posted to issues@hive.apache.org by "Mass Dosage (Jira)" <ji...@apache.org> on 2020/02/11 11:39:00 UTC
[jira] [Commented] (HIVE-21508) ClassCastException when
initializing HiveMetaStoreClient on JDK10 or newer
[ https://issues.apache.org/jira/browse/HIVE-21508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17034359#comment-17034359 ]
Mass Dosage commented on HIVE-21508:
------------------------------------
Could we please get this into a Hive 2.3.7 release?
> 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, 3.2.0, 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-21508.5.branch-3.1.patch, HIVE-21508.6.branch-3.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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