Module column_family (2.9.0)

Version 2.9.0

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User friendly container for Google Cloud Bigtable Column Family.

Classes

ColumnFamily

ColumnFamily(column_family_id, table, gc_rule=None)

Representation of a Google Cloud Bigtable Column Family.

We can use a ColumnFamily to:

• create itself
• update itself
• delete itself

Parameters

Name	Description
column_family_id	str The ID of the column family. Must be of the form <code>_a-zA-Z0-9][-_.a-zA-Z0-9]</code>*.
table	Table The table that owns the column family.
gc_rule	GarbageCollectionRule (Optional) The garbage collection settings for this column family.

GCRuleIntersection

GCRuleIntersection(rules)

Intersection of garbage collection rules.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_create_family_gc_intersection] :end-before: [END bigtable_api_create_family_gc_intersection] :dedent: 4

Parameter

Name	Description
rules	list List of GarbageCollectionRule.

GCRuleUnion

GCRuleUnion(rules)

Union of garbage collection rules.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_create_family_gc_union] :end-before: [END bigtable_api_create_family_gc_union] :dedent: 4

Parameter

Name	Description
rules	list List of GarbageCollectionRule.

GarbageCollectionRule

GarbageCollectionRule()

Garbage collection rule for column families within a table.

Cells in the column family (within a table) fitting the rule will be deleted during garbage collection.

Note: This class is a do-nothing base class for all GC rules.

A string gc_expression can also be used with API requests, but that value would be superceded by a gc_rule. As a result, we don't support that feature and instead support via native classes.

MaxAgeGCRule

MaxAgeGCRule(max_age)

Garbage collection limiting the age of a cell.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_create_family_gc_max_age] :end-before: [END bigtable_api_create_family_gc_max_age] :dedent: 4

Parameter

Name	Description
max_age	datetime.timedelta The maximum age allowed for a cell in the table.

MaxVersionsGCRule

MaxVersionsGCRule(max_num_versions)

Garbage collection limiting the number of versions of a cell.

For example:

.. literalinclude:: snippets_table.py :start-after: [START bigtable_api_create_family_gc_max_versions] :end-before: [END bigtable_api_create_family_gc_max_versions] :dedent: 4

Parameter

Name	Description
max_num_versions	int The maximum number of versions