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Crea una familia de columnas con una política de recolección de elementos no utilizados basada en la antigüedad.

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Para obtener documentación en la que se incluye esta muestra de código, consulta lo siguiente:

Cómo configurar la recolección de elementos no utilizados

Muestra de código

C++

Si deseas obtener información sobre cómo instalar y usar la biblioteca cliente de Bigtable, consulta las bibliotecas cliente de Bigtable.

Para autenticarte en Bigtable, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local.

namespace cbt = ::google::cloud::bigtable;
namespace cbta = ::google::cloud::bigtable_admin;
using ::google::bigtable::admin::v2::ModifyColumnFamiliesRequest;
using ::google::cloud::StatusOr;
[](cbta::BigtableTableAdminClient admin, std::string const& project_id,
   std::string const& instance_id, std::string const& table_id,
   std::string const& family_name) {
  std::string table_name = cbt::TableName(project_id, instance_id, table_id);
  auto constexpr kSecondsPerDay =
      std::chrono::seconds(std::chrono::hours(24)).count();

  ModifyColumnFamiliesRequest::Modification mod;
  mod.set_id(family_name);
  mod.mutable_create()->mutable_gc_rule()->mutable_max_age()->set_seconds(
      5 * kSecondsPerDay);

  StatusOr<google::bigtable::admin::v2::Table> schema =
      admin.ModifyColumnFamilies(table_name, {std::move(mod)});

  if (!schema) throw std::move(schema).status();
  std::cout << "Schema modified to: " << schema->DebugString() << "\n";
}

C#

Para aprender a instalar y usar la biblioteca cliente de Bigtable, consulta Bibliotecas cliente de Bigtable.

// Create a column family with GC policy : maximum age
// where age = current time minus cell timestamp
// Initialize request argument(s).
// Define the GC rule to retain data with max age of 5 days
GcRule MaxAgeRule = new GcRule { MaxAge = Duration.FromTimeSpan(TimeSpan.FromDays(5.0)) };

// Column family to create
ColumnFamily columnFamily = new ColumnFamily { GcRule = MaxAgeRule };

TableName tableName = new TableName(projectId, instanceId, tableId);

// Modification to create column family
ModifyColumnFamiliesRequest.Types.Modification modification = new ModifyColumnFamiliesRequest.Types.Modification
{
    Create = columnFamily,
    Id = "cf1"
};

ModifyColumnFamiliesRequest request = new ModifyColumnFamiliesRequest
{
    TableName = tableName,
    Modifications = { modification }
};
try
{
    // Make the request
    Table response = bigtableTableAdminClient.ModifyColumnFamilies(request);
    Console.WriteLine("Created column family");
    // Print table information.
    GetTable(tableId);
}
catch (Exception ex)
{
    Console.WriteLine($"Error creating column family {ex.Message}");
}

Go

Si deseas obtener información sobre cómo instalar y usar la biblioteca cliente de Bigtable, consulta las bibliotecas cliente de Bigtable.

import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/bigtable"
)

func createFamilyGCMaxAge(w io.Writer, projectID, instanceID string, tableName string) error {
	// projectID := "my-project-id"
	// instanceID := "my-instance-id"
	// tableName := "my-table-name"

	ctx := context.Background()

	adminClient, err := bigtable.NewAdminClient(ctx, projectID, instanceID)
	if err != nil {
		return fmt.Errorf("bigtable.NewAdminClient: %w", err)
	}
	defer adminClient.Close()

	columnFamilyName := "cf1"
	if err := adminClient.CreateColumnFamily(ctx, tableName, columnFamilyName); err != nil {
		return fmt.Errorf("CreateColumnFamily(%s): %w", columnFamilyName, err)
	}

	// Set a garbage collection policy of 5 days.
	maxAge := time.Hour * 24 * 5
	policy := bigtable.MaxAgePolicy(maxAge)
	if err := adminClient.SetGCPolicy(ctx, tableName, columnFamilyName, policy); err != nil {
		return fmt.Errorf("SetGCPolicy(%s): %w", policy, err)
	}

	fmt.Fprintf(w, "created column family %s with policy: %v\n", columnFamilyName, policy)
	return nil
}

Java

Si deseas obtener información sobre cómo instalar y usar la biblioteca cliente de Bigtable, consulta las bibliotecas cliente de Bigtable.

// Creates a column family with GC policy : maximum age
// where age = current time minus cell timestamp

// Defines the GC rule to retain data with max age of 5 days.
DurationRule maxAgeRule = GCRULES.maxAge(5, TimeUnit.DAYS);

// Creates column family with given GC rule.
try {
  // ModifyColumnFamiliesRequest can be used both for adding and modifying families, here it is
  // being used to add a family
  ModifyColumnFamiliesRequest columnFamiliesRequest =
      ModifyColumnFamiliesRequest.of(tableId).addFamily(COLUMN_FAMILY_1, maxAgeRule);
  adminClient.modifyFamilies(columnFamiliesRequest);
  System.out.println("Created column family: " + COLUMN_FAMILY_1);
} catch (AlreadyExistsException e) {
  System.err.println(
      "Failed to create column family with rule, already exists: " + e.getMessage());
}

Node.js

Para aprender a instalar y usar la biblioteca cliente de Bigtable, consulta Bibliotecas cliente de Bigtable.

// Create a column family with GC policy : maximum age
// where age = current time minus cell timestamp

// Define the GC rule to retain data with max age of 5 days
const maxAgeRule = {
  rule: {
    age: {
      // Value must be atleast 1 millisecond
      seconds: 60 * 60 * 24 * 5,
      nanos: 0,
    },
  },
};

let [family] = await table.createFamily('cf1', maxAgeRule);
console.log(`Created column family ${family.id}`);

PHP

Si deseas obtener información sobre cómo instalar y usar la biblioteca cliente de Bigtable, consulta las bibliotecas cliente de Bigtable.

use Google\Cloud\Bigtable\Admin\V2\Client\BigtableTableAdminClient;
use Google\Cloud\Bigtable\Admin\V2\ColumnFamily;
use Google\Cloud\Bigtable\Admin\V2\GcRule;
use Google\Cloud\Bigtable\Admin\V2\ModifyColumnFamiliesRequest;
use Google\Cloud\Bigtable\Admin\V2\ModifyColumnFamiliesRequest\Modification;
use Google\Protobuf\Duration;

/**
 * Create a new column family with a max age GC rule
 *
 * @param string $projectId The Google Cloud project ID
 * @param string $instanceId The ID of the Bigtable instance where the table resides
 * @param string $tableId The ID of the table in which the rule needs to be created
 */
function create_family_gc_max_age(
    string $projectId,
    string $instanceId,
    string $tableId
): void {
    $tableAdminClient = new BigtableTableAdminClient();

    $tableName = $tableAdminClient->tableName($projectId, $instanceId, $tableId);

    print('Creating column family cf1 with MaxAge GC Rule...' . PHP_EOL);
    // Create a column family with GC policy : maximum age
    // where age = current time minus cell timestamp

    $columnFamily1 = new ColumnFamily();
    $duration = new Duration();
    $duration->setSeconds(3600 * 24 * 5);
    $MaxAgeRule = (new GcRule())->setMaxAge($duration);
    $columnFamily1->setGcRule($MaxAgeRule);

    $columnModification = new Modification();
    $columnModification->setId('cf1');
    $columnModification->setCreate($columnFamily1);
    $modifyColumnFamiliesRequest = (new ModifyColumnFamiliesRequest())
        ->setName($tableName)
        ->setModifications([$columnModification]);
    $tableAdminClient->modifyColumnFamilies($modifyColumnFamiliesRequest);
    print('Created column family cf1 with MaxAge GC Rule.' . PHP_EOL);
}

Python

Si deseas obtener información sobre cómo instalar y usar la biblioteca cliente de Bigtable, consulta las bibliotecas cliente de Bigtable.

    print("Creating column family cf1 with with MaxAge GC Rule...")
    # Create a column family with GC policy : maximum age
    # where age = current time minus cell timestamp

    # Define the GC rule to retain data with max age of 5 days
    max_age_rule = column_family.MaxAgeGCRule(datetime.timedelta(days=5))

    column_family1 = table.column_family("cf1", max_age_rule)
    column_family1.create()
    print("Created column family cf1 with MaxAge GC Rule.")

Ruby

Si deseas obtener información sobre cómo instalar y usar la biblioteca cliente de Bigtable, consulta las bibliotecas cliente de Bigtable.

# Create a column family with GC policy : maximum age
# where age = current time minus cell timestamp
# NOTE: Age value must be atleast 1 millisecond
max_age_rule = Google::Cloud::Bigtable::GcRule.max_age 60 * 60 * 24 * 5
column_families = table.column_families do |cfs|
  cfs.add "cf1", gc_rule: max_age_rule
end
family = column_families["cf1"]

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