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https://issues.apache.org/jira/browse/HIVE-24849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17300233#comment-17300233
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Sungwoo commented on HIVE-24849:
--------------------------------
I think both HiveServer2 and Metastore try connections to S3 when 'create
external table' is executed with a concrete location.
Here is part of the trace log of MinIO when 'create external table' is executed.
0: jdbc:hive2://orange1:444/> CREATE EXTERNAL TABLE t2 (value string)
PARTITIONED BY (`date` string, shard string) LOCATION 's3a://tmp/load/';
01:29:41.889 [404 Not Found] s3.HeadObject orange0:9000/tmp/load 192.168.10.2
667µs ↑ 153 B ↓ 196 B
01:29:41.893 [404 Not Found] s3.HeadObject orange0:9000/tmp/load/ 192.168.10.2
749µs ↑ 153 B ↓ 196 B
01:29:41.897 [200 OK] s3.ListObjectsV2
orange0:9000/tmp/?list-type=2&delimiter=%2F&max-keys=1&prefix=load%2F&fetch-owner=false
192.168.10.2 1.788ms ↑ 153 B ↓ 611 B
01:29:41.903 [404 Not Found] s3.HeadObject orange0:9000/tmp/load 192.168.10.2
561µs ↑ 153 B ↓ 196 B
01:29:41.906 [404 Not Found] s3.HeadObject orange0:9000/tmp/load/ 192.168.10.2
714µs ↑ 153 B ↓ 196 B
01:29:41.910 [200 OK] s3.ListObjectsV2
orange0:9000/tmp/?list-type=2&delimiter=%2F&max-keys=1&prefix=load%2F&fetch-owner=false
192.168.10.2 1.079ms ↑ 153 B ↓ 611 B
01:29:41.914 [200 OK] s3.ListObjectsV2
orange0:9000/tmp/?list-type=2&delimiter=%2F&max-keys=5000&prefix=load%2F&fetch-owner=false
192.168.10.2 10.547ms ↑ 153 B ↓ 6.8 KiB
01:29:41.962 [200 OK] s3.HeadBucket orange0:9000/tmp/ 192.168.10.2 507µs
↑ 153 B ↓ 189 B
01:29:41.983 [404 Not Found] s3.HeadObject orange0:9000/tmp/load 192.168.10.2
419µs ↑ 153 B ↓ 196 B
01:29:41.985 [404 Not Found] s3.HeadObject orange0:9000/tmp/load/ 192.168.10.2
810µs ↑ 153 B ↓ 196 B
01:29:41.989 [200 OK] s3.ListObjectsV2
orange0:9000/tmp/?list-type=2&delimiter=%2F&max-keys=1&prefix=load%2F&fetch-owner=false
192.168.10.2 1.415ms ↑ 153 B ↓ 611 B
The problem here is that HiveServer2 and Metastore send ListObjectV2 requests
which are equivalent to executing 'aws s3api list-objects-V2 --bucket ...' and
thus make a recursive traversal of the destination bucket. As a result, the
execution time is proportional to the number of entries inside the bucket.
For HiveServer2, we can update toTable() method in CreateTableDesc.java. It has
this code:
if (!this.isCTAS && (tbl.getPath() == null || (tbl.isEmpty() &&
!isExternal()))) {
This code is bad because it calls tbl.isEmpty() which sends a ListObjectV2
request, but only to return false in the end as isExternal() evalutes to true.
We can revise the code as follows:
if (!this.isCTAS && (tbl.getPath() == null || (!isExternal() &&
tbl.isEmpty()))) {
Now, HiveServer2 does not send ListObjectV2 requests. Still Metastore sends a
ListObjectV2 request from Warehouse.isDir().
So, a partial solution is to revise toTable() method in CreateTableDesc.java.
> Create external table socket timeout when location has large number of files
> ----------------------------------------------------------------------------
>
> Key: HIVE-24849
> URL: https://issues.apache.org/jira/browse/HIVE-24849
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Affects Versions: 2.3.4
> Environment: AWS EMR 5.23 with default Hive metastore and external
> location S3
>
> Reporter: Mithun Antony
> Priority: Major
>
> # The create table API call timeout when during an external table creation on
> a location where the number files in the S3 location is large ( ie: ~10K
> objects ).
> The default timeout `hive.metastore.client.socket.timeout` is `600s` current
> workaround is it to increase the timeout to a higher value
> {code:java}
> 2021-03-04T01:37:42,761 ERROR [66b8024b-e52f-42b8-8629-a45383bcac0c
> main([])]: exec.DDLTask (DDLTask.java:failed(639)) -
> org.apache.hadoop.hive.ql.metadata.HiveException:
> org.apache.thrift.transport.TTransportException:
> java.net.SocketTimeoutException: Read timed out
> at org.apache.hadoop.hive.ql.metadata.Hive.createTable(Hive.java:873)
> at org.apache.hadoop.hive.ql.metadata.Hive.createTable(Hive.java:878)
> at org.apache.hadoop.hive.ql.exec.DDLTask.createTable(DDLTask.java:4356)
> at org.apache.hadoop.hive.ql.exec.DDLTask.execute(DDLTask.java:354)
> at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:199)
> at
> org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:100)
> at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:2183)
> at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1839)
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1526)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1237)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1227)
> at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:233)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:184)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
> at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:336)
> at org.apache.hadoop.hive.cli.CliDriver.processReader(CliDriver.java:474)
> at org.apache.hadoop.hive.cli.CliDriver.processFile(CliDriver.java:490)
> at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:793)
> at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:759)
> at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:686)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at org.apache.hadoop.util.RunJar.run(RunJar.java:239)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:153)
> Caused by: org.apache.thrift.transport.TTransportException:
> java.net.SocketTimeoutException: Read timed out
> at
> org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:129)
> at org.apache.thrift.transport.TTransport.readAll(TTransport.java:86)
> at
> org.apache.thrift.protocol.TBinaryProtocol.readAll(TBinaryProtocol.java:429)
> at
> org.apache.thrift.protocol.TBinaryProtocol.readI32(TBinaryProtocol.java:318)
> at
> org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin(TBinaryProtocol.java:219)
> at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:77)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Client.recv_create_table_with_environment_context(ThriftHiveMetastore.java:1199)
> at
> org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Client.create_table_with_environment_context(ThriftHiveMetastore.java:1185)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStoreClient.create_table_with_environment_context(HiveMetaStoreClient.java:2399)
> at
> org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient.create_table_with_environment_context(SessionHiveMetaStoreClient.java:93)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStoreClient.createTable(HiveMetaStoreClient.java:752)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStoreClient.createTable(HiveMetaStoreClient.java:740)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.invoke(RetryingMetaStoreClient.java:173)
> at com.sun.proxy.$Proxy37.createTable(Unknown Source)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.hive.metastore.HiveMetaStoreClient$SynchronizedHandler.invoke(HiveMetaStoreClient.java:2330)
> at com.sun.proxy.$Proxy37.createTable(Unknown Source)
> at org.apache.hadoop.hive.ql.metadata.Hive.createTable(Hive.java:863)
> ... 25 more
> Caused by: java.net.SocketTimeoutException: Read timed out
> at java.net.SocketInputStream.socketRead0(Native Method)
> at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
> at java.net.SocketInputStream.read(SocketInputStream.java:171)
> at java.net.SocketInputStream.read(SocketInputStream.java:141)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
> at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
> at
> org.apache.thrift.transport.TIOStreamTransport.read(TIOStreamTransport.java:127)
> ... 49 more{code}
>
> Understanding is the create table should not check the exisiting
> files/partitions and the validation is done when the table is read.
> The issue could be reproduced executing the below statment in Hive CLI where
> the location should contain ~10k objects
>
> {code:java}
> SET hive.stats.autogather=false;
> DROP table if exists tTable;
> CREATE EXTERNAL TABLE tTable(
> id string,
> mId string,
> wd bigint,
> lang string,
> tcountry string,
> vId bigint
> )
> ROW FORMAT DELIMITED FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n'
> LOCATION "s3://<your bucket>/"
> TBLPROPERTIES ('serialization.null.format' = ''); {code}
>
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