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https://issues.apache.org/jira/browse/HIVE-13160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179167#comment-15179167
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Prasanth Jayachandran commented on HIVE-13160:
----------------------------------------------
This breaks compatibility when running CLI with old HMS. Earlier this exception
was ignored by CLI when session is started but now it throws. I am not sure
what the expected behavior here is, should the new clients (> 2.0) be
compatible with old HMS?
> HS2 unable to load UDFs on startup when HMS is not ready
> --------------------------------------------------------
>
> Key: HIVE-13160
> URL: https://issues.apache.org/jira/browse/HIVE-13160
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 1.2.1
> Reporter: Eric Lin
> Assignee: Aihua Xu
> Fix For: 2.1.0
>
> Attachments: HIVE-13160.1.patch, HIVE-13160.2.patch
>
>
> The error looks like this:
> {code}
> 2016-02-18 14:43:54,251 INFO hive.metastore: [main]: Trying to connect to
> metastore with URI thrift://host-10-17-81-201.coe.cloudera.com:9083
> 2016-02-18 14:48:54,692 WARN hive.metastore: [main]: Failed to connect to
> the MetaStore Server...
> 2016-02-18 14:48:54,692 INFO hive.metastore: [main]: Waiting 1 seconds
> before next connection attempt.
> 2016-02-18 14:48:55,692 INFO hive.metastore: [main]: Trying to connect to
> metastore with URI thrift://host-10-17-81-201.coe.cloudera.com:9083
> 2016-02-18 14:53:55,800 WARN hive.metastore: [main]: Failed to connect to
> the MetaStore Server...
> 2016-02-18 14:53:55,800 INFO hive.metastore: [main]: Waiting 1 seconds
> before next connection attempt.
> 2016-02-18 14:53:56,801 INFO hive.metastore: [main]: Trying to connect to
> metastore with URI thrift://host-10-17-81-201.coe.cloudera.com:9083
> 2016-02-18 14:58:56,967 WARN hive.metastore: [main]: Failed to connect to
> the MetaStore Server...
> 2016-02-18 14:58:56,967 INFO hive.metastore: [main]: Waiting 1 seconds
> before next connection attempt.
> 2016-02-18 14:58:57,994 WARN hive.ql.metadata.Hive: [main]: Failed to
> register all functions.
> java.lang.RuntimeException: Unable to instantiate
> org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
> at
> org.apache.hadoop.hive.metastore.MetaStoreUtils.newInstance(MetaStoreUtils.java:1492)
> at
> org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.<init>(RetryingMetaStoreClient.java:64)
> at
> org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.getProxy(RetryingMetaStoreClient.java:74)
> at
> org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:2915)
> .......
> 016-02-18 14:58:57,997 INFO hive.metastore: [main]: Trying to connect to
> metastore with URI thrift://host-10-17-81-201.coe.cloudera.com:9083
> 2016-02-18 15:03:58,094 WARN hive.metastore: [main]: Failed to connect to
> the MetaStore Server...
> 2016-02-18 15:03:58,095 INFO hive.metastore: [main]: Waiting 1 seconds
> before next connection attempt.
> 2016-02-18 15:03:59,095 INFO hive.metastore: [main]: Trying to connect to
> metastore with URI thrift://host-10-17-81-201.coe.cloudera.com:9083
> 2016-02-18 15:08:59,203 WARN hive.metastore: [main]: Failed to connect to
> the MetaStore Server...
> 2016-02-18 15:08:59,203 INFO hive.metastore: [main]: Waiting 1 seconds
> before next connection attempt.
> 2016-02-18 15:09:00,203 INFO hive.metastore: [main]: Trying to connect to
> metastore with URI thrift://host-10-17-81-201.coe.cloudera.com:9083
> 2016-02-18 15:14:00,304 WARN hive.metastore: [main]: Failed to connect to
> the MetaStore Server...
> 2016-02-18 15:14:00,304 INFO hive.metastore: [main]: Waiting 1 seconds
> before next connection attempt.
> 2016-02-18 15:14:01,306 INFO org.apache.hive.service.server.HiveServer2:
> [main]: Shutting down HiveServer2
> 2016-02-18 15:14:01,308 INFO org.apache.hive.service.server.HiveServer2:
> [main]: Exception caught when calling stop of HiveServer2 before retrying
> start
> java.lang.NullPointerException
> at
> org.apache.hive.service.server.HiveServer2.stop(HiveServer2.java:283)
> at
> org.apache.hive.service.server.HiveServer2.startHiveServer2(HiveServer2.java:351)
> at
> org.apache.hive.service.server.HiveServer2.access$400(HiveServer2.java:69)
> at
> org.apache.hive.service.server.HiveServer2$StartOptionExecutor.execute(HiveServer2.java:545)
> {code}
> And then none of the functions will be available for use as HS2 does not
> re-register them after HMS is up and ready.
> This is not desired behaviour, we shouldn't allow HS2 to be in a servicing
> state if function list is not ready. Or, maybe instead of initialize the
> function list when HS2 starts, try to load the function list when each Hive
> session is created. Of course we can have a cache of function list somewhere
> for better performance, but we would better decouple it from class Hive.
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