我正在连接S3 Buckets到Apache Hive，以便我可以直接通过PrestoDB查询S3中的Parquet文件。我正在使用Teradata的PrestoDB HDP VM。
为此，我配置了hive-site.xml文件并在/etc/hive/conf/hive-site.xml文件中添加了我的AWS访问密钥和密钥，如：
<property>
<name>hive.s3.aws-access-key</name>
<value>something</value>
</property>
<property>
<name>hive.s3.aws-secret-key</name>
<value>some-other-thing</value>
</property>
现在，Parquet文件所在的S3 Bucket URL路径如下所示：
https://s3.console.aws.amazon.com/s3/buckets/sb.mycompany.com/someFolder/anotherFolder/?region=us-east-2&tab=overview
创建外部表时，我在查询中将S3的位置指定为：
CREATE TABLE hive.project.data (... schema ...)
WITH ( format = 'PARQUET',
external_location = 's3://sb.mycompany.com/someFolder/anotherFolder/?region=us-east-2&tab=overview')
Apache Hive 无法连接到S3存储桶并使用--debug标志显示此错误：
Query 20180316_112407_00005_aj9x6 failed: Unable to load credentials from service endpoint
========= TECHNICAL DETAILS =========
[ Error message ]
Unable to load credentials from service endpoint
[ Session information ]
ClientSession{server=http://localhost:8080, user=presto, clientInfo=null, catalog=null, schema=null, timeZone=Zulu, locale=en_US, properties={}, transactionId=null, debug=true, quiet=false}
[ Stack trace ]
com.amazonaws.AmazonClientException: Unable to load credentials from service endpoint
at com.amazonaws.auth.EC2CredentialsFetcher.handleError(EC2CredentialsFetcher.java:180)
at com.amazonaws.auth.EC2CredentialsFetcher.fetchCredentials(EC2CredentialsFetcher.java:159)
at com.amazonaws.auth.EC2CredentialsFetcher.getCredentials(EC2CredentialsFetcher.java:82)
at com.amazonaws.auth.InstanceProfileCredentialsProvider.getCredentials(InstanceProfileCredentialsProvider.java:104)
at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:4016)
at com.amazonaws.services.s3.AmazonS3Client.getBucketRegionViaHeadRequest(AmazonS3Client.java:4478)
at com.amazonaws.services.s3.AmazonS3Client.fetchRegionFromCache(AmazonS3Client.java:4452)
at com.amazonaws.services.s3.AmazonS3Client.resolveServiceEndpoint(AmazonS3Client.java:4426)
at com.amazonaws.services.s3.AmazonS3Client.getObjectMetadata(AmazonS3Client.java:1167)
at com.amazonaws.services.s3.AmazonS3Client.getObjectMetadata(AmazonS3Client.java:1152)
at com.facebook.presto.hive.PrestoS3FileSystem.lambda$getS3ObjectMetadata$2(PrestoS3FileSystem.java:552)
at com.facebook.presto.hive.RetryDriver.run(RetryDriver.java:138)
at com.facebook.presto.hive.PrestoS3FileSystem.getS3ObjectMetadata(PrestoS3FileSystem.java:549)
at com.facebook.presto.hive.PrestoS3FileSystem.getFileStatus(PrestoS3FileSystem.java:305)
at org.apache.hadoop.fs.FileSystem.isDirectory(FileSystem.java:1439)
at com.facebook.presto.hive.HiveMetadata.getExternalPath(HiveMetadata.java:719)
at com.facebook.presto.hive.HiveMetadata.createTable(HiveMetadata.java:690)
at com.facebook.presto.spi.connector.classloader.ClassLoaderSafeConnectorMetadata.createTable(ClassLoaderSafeConnectorMetadata.java:218)
at com.facebook.presto.metadata.MetadataManager.createTable(MetadataManager.java:505)
at com.facebook.presto.execution.CreateTableTask.execute(CreateTableTask.java:148)
at com.facebook.presto.execution.CreateTableTask.execute(CreateTableTask.java:57)
at com.facebook.presto.execution.DataDefinitionExecution.start(DataDefinitionExecution.java:111)
at com.facebook.presto.execution.QueuedExecution.lambda$start$1(QueuedExecution.java:63)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.ConnectException: Network is unreachable
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
at sun.net.www.http.HttpClient.New(HttpClient.java:308)
at sun.net.www.http.HttpClient.New(HttpClient.java:326)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1169)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1105)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:933)
at com.amazonaws.internal.ConnectionUtils.connectToEndpoint(ConnectionUtils.java:47)
at com.amazonaws.internal.EC2CredentialsUtils.readResource(EC2CredentialsUtils.java:106)
at com.amazonaws.internal.EC2CredentialsUtils.readResource(EC2CredentialsUtils.java:77)
at com.amazonaws.auth.InstanceProfileCredentialsProvider$InstanceMetadataCredentialsEndpointProvider.getCredentialsEndpoint(InstanceProfileCredentialsProvider.java:117)
at com.amazonaws.auth.EC2CredentialsFetcher.fetchCredentials(EC2CredentialsFetcher.java:121)
... 24 more
========= TECHNICAL DETAILS END =========
我添加了密钥后，甚至重新启动了PrestDB服务器。接下来，我尝试将我的属性添加到/home/presto/.prestoadmin/catalog/hive.properties：
connector.name=hive-hadoop2
hive.metastore.uri=thrift://localhost:9083
hive.allow-drop-table=true
hive.allow-rename-table=true
hive.time-zone=UTC
hive.metastore-cache-ttl=0s
hive.s3.use-instance-credentials=false
hive.s3.aws-access-key=something
hive.s3.aws-secret-key=some-other-thing
再次重启PrestoDB服务器，但问题仍然存在。
然后，我仅使用存储桶名称修改了查询中的S3存储桶位置：
external_location = 's3://sb.mycompany.com'
还有s3a计划：
external_location = 's3a://sb.mycompany.com'
但同样的问题仍然存在。我做错了什么？
答案 0 :(得分：0)
这令人尴尬。在我使用的VM上，网络适配器存在问题，因此VM无法连接到Internet。我纠正了适配器，它现在正在工作。