Adar Dembo created HIVE-21508:
---------------------------------
Summary: 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: 2.3.4, 3.2.0
Reporter: Adar Dembo
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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