java - 无法从Hive更改表格位置

Question

根据Running Apache Hive with Alluxio的教程，我将Alluxio设置在Ceph和Hive之间的中间层，我试图从Alluxio提供服务于HDFS中存储的现有表，因为我现在使用external table来访问数据。
这里的关键步骤是将表位置从HDFS和Ceph之类的分布式存储系统修改为alluxio:

4.2. Move an External Table from HDFS to Alluxio Assume there is an existing external table u_user in Hive with location set to hdfs://namenode_hostname:port/ml-100k. You can use the following HiveQL statement to check its “Location” attribute:

hive> desc formatted u_user;
Then use the following HiveQL statement to change the table data location from HDFS to Alluxio：

hive> alter table u_user set location "alluxio://master_hostname:port/ml-100k";

我使用的语句是:

alter table call_center set location "alluxio://alluxio_master:19998/tpcds_text_1000.db/call_center";

但是，我得到如下错误:

 ERROR ql.Driver: FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. Unable to alter table. null

通过在WARN日志级别中打开配置单元，我们获得了更多的异常详细信息:

WARN [ main] metastore.RetryingMetaStoreClient: MetaStoreClient lost connection. Attempting to reconnect (1 of 1) after 1s. alter_table_with_environmentContext
org.apache.thrift.transport.TTransportException: null
        at org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:132) ~[hive-exec-3.1.1.jar:3.1.1]
        at org.apache.thrift.transport.TTransport.readAll(TTransport.java:86) ~[hive-exec-3.1.1.jar:3.1.1]
        at org.apache.thrift.protocol.TBinaryProtocol.readAll(TBinaryProtocol.java:429) ~[hive-exec-3.1.1.jar:3.1.1]

当前的call_center表信息如下:

# Detailed Table Information
Database:               tpcds_text_1000
OwnerType:              USER
Owner:                  root
Retention:              0
Location:               s3a://tpcds/user/root/tpcds/1000/call_center
Table Type:             EXTERNAL_TABLE

任何评论都欢迎，谢谢。

Answer 1

Running Apache Hive with Alluxio中的某些修改可能仅在重新启动metastore之后才生效。

我杀死了metastore并通过hive --service metastore重新启动了它，然后成功修改了表位置。

对于可能遇到相同情况的任何人，请在此处保留此线程。