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fixed table and minor nav changes
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drothery-edb committed Mar 22, 2022
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Expand Up @@ -97,8 +97,7 @@ The role that defines the server is the owner of the server; use the `ALTER SERV
| auth_type<br /> | The authentication type of the client; specify LDAP or NOSASL. If you do not specify an auth_type, the data wrapper will decide the auth_type value on the basis of the user mapping. If the user mapping includes a user name and password, the data wrapper will use LDAP authentication. <If the user mapping does not include a user name and password, the data wrapper will use NOSASL authentication. |
| connect_timeout | The length of time before a connection attempt times out. The default value is \`300\` seconds |
| enable_join_pushdown | Similar to the table-level option, but configured at the server-level. If true, pushes the join between two foreign tables from the same foreign server instead of fetching all the rows for both the tables and performing a join locally. This option can also be set for an individual table and if any of the tables involved in the join has set the option to false then the join is not pushed down. The table-level value of the option takes precedence over the server-level option value. Default is true. |

| fetch_size | A user-specified value that is provided as a parameter to the JDBC API setFetchSize. The default value is \`10,000\`. |
| fetch_size | A user-specified value that is provided as a parameter to the JDBC API setFetchSize. The default value is \`10,000\`. |
| log_remote_sql | If true, logging will include SQL commands executed on the remote hive server and the number of times that a scan is repeated. The default is \`false\`. |
| query_timeout | Use query_timeout to provide the number of seconds after which a request will timeout if it is not satisfied by the Hive server. Query timeout is not supported by the Hive JDBC driver. |
| use_remote_estimate | Include the use_remote_estimate to instruct the server to use EXPLAIN commands on the remote server when estimating processing costs. By default, use_remote_estimate is false, and remote tables are assumed to have \`1000\` rows. |
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11 changes: 11 additions & 0 deletions product_docs/docs/hadoop_data_adapter/2/index.mdx
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title: "Hadoop Foreign Data Wrapper"
navigation:
- hadoop_rel_notes
- 02_requirements_overview
- 03_architecture_overview
- 04_supported_authentication_methods
- 05_installing_the_hadoop_data_adapter
- 08_configuring_the_hadoop_data_adapter
- 06_updating_the_hadoop_data_adapter
- 07_features_of_hdfs_fdw
- 09_using_the_hadoop_data_adapter
- 10_identifying_data_adapter_version
- 10a_example_join_pushdown
- 11_uninstalling_the_hadoop_data_adapter
---

The Hadoop Foreign Data Wrapper (`hdfs_fdw`) is a Postgres extension that allows you to access data that resides on a Hadoop file system from EDB Postgres Advanced Server. The foreign data wrapper makes the Hadoop file system a read-only data source that you can use with Postgres functions and utilities, or in conjunction with other data that resides on a Postgres host.
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