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hadoop-catalog.md

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Hadoop catalog
/hadoop-catalog
2024-04-02
hadoop catalog
This software is licensed under the Apache License version 2.

Introduction

Hadoop catalog is a fileset catalog that using Hadoop Compatible File System (HCFS) to manage the storage location of the fileset. Currently, it supports local filesystem and HDFS. For object storage like S3, GCS, and Azure Blob Storage, you can put the hadoop object store jar like hadoop-aws into the $GRAVITINO_HOME/catalogs/hadoop/libs directory to enable the support. Gravitino itself hasn't yet tested the object storage support, so if you have any issue, please create an issue.

Note that Gravitino uses Hadoop 3 dependencies to build Hadoop catalog. Theoretically, it should be compatible with both Hadoop 2.x and 3.x, since Gravitino doesn't leverage any new features in Hadoop 3. If there's any compatibility issue, please create an issue.

Catalog

Catalog properties

Besides the common catalog properties, the Hadoop catalog has the following properties:

Property Name Description Default Value Required Since Version
location The storage location managed by Hadoop catalog. (none) No 0.5.0
authentication.impersonation-enable Whether to enable impersonation for the Hadoop catalog. false No 0.5.1
authentication.type The type of authentication for Hadoop catalog, currently we only support kerberos, simple. simple No 0.5.1
authentication.kerberos.principal The principal of the Kerberos authentication (none) required if the value of authentication.type is Kerberos. 0.5.1
authentication.kerberos.keytab-uri The URI of The keytab for the Kerberos authentication. (none) required if the value of authentication.type is Kerberos. 0.5.1
authentication.kerberos.check-interval-sec The check interval of Kerberos credential for Hadoop catalog. 60 No 0.5.1
authentication.kerberos.keytab-fetch-timeout-sec The fetch timeout of retrieving Kerberos keytab from authentication.kerberos.keytab-uri. 60 No 0.5.1

Authentication for Hadoop Catalog

The Hadoop catalog supports multi-level authentication to control access, allowing different authentication settings for the catalog, schema, and fileset. The priority of authentication settings is as follows: catalog < schema < fileset. Specifically:

  • Catalog: The default authentication is simple.
  • Schema: Inherits the authentication setting from the catalog if not explicitly set. For more information about schema settings, please refer to Schema properties.
  • Fileset: Inherits the authentication setting from the schema if not explicitly set. For more information about fileset settings, please refer to Fileset properties.

The default value of authentication.impersonation-enable is false, and the default value for catalogs about this configuration is false, for schemas and filesets, the default value is inherited from the parent. Value set by the user will override the parent value, and the priority mechanism is the same as authentication.

Catalog operations

Refer to Catalog operations for more details.

Schema

Schema capabilities

The Hadoop catalog supports creating, updating, deleting, and listing schema.

Schema properties

Property name Description Default value Required Since Version
location The storage location managed by Hadoop schema. (none) No 0.5.0
authentication.impersonation-enable Whether to enable impersonation for this schema of the Hadoop catalog. The parent(catalog) value No 0.6.0
authentication.type The type of authentication for this schema of Hadoop catalog , currently we only support kerberos, simple. The parent(catalog) value No 0.6.0
authentication.kerberos.principal The principal of the Kerberos authentication for this schema. The parent(catalog) value No 0.6.0
authentication.kerberos.keytab-uri The URI of The keytab for the Kerberos authentication for this scheam. The parent(catalog) value No 0.6.0

Schema operations

Refer to Schema operation for more details.

Fileset

Fileset capabilities

  • The Hadoop catalog supports creating, updating, deleting, and listing filesets.

Fileset properties

Property name Description Default value Required Since Version
authentication.impersonation-enable Whether to enable impersonation for the Hadoop catalog fileset. The parent(schema) value No 0.6.0
authentication.type The type of authentication for Hadoop catalog fileset, currently we only support kerberos, simple. The parent(schema) value No 0.6.0
authentication.kerberos.principal The principal of the Kerberos authentication for the fileset. The parent(schema) value No 0.6.0
authentication.kerberos.keytab-uri The URI of The keytab for the Kerberos authentication for the fileset. The parent(schema) value No 0.6.0

Fileset operations

Refer to Fileset operations for more details.