Package com.gpudb.protocol

Class AdminRebalanceRequest.Options

java.lang.Object

com.gpudb.protocol.AdminRebalanceRequest.Options

Enclosing class:

AdminRebalanceRequest

public static final class AdminRebalanceRequest.Options
extends Object

A set of string constants for the AdminRebalanceRequest parameter options.

Optional parameters.

Field Summary

Fields

Modifier and Type	Field	Description
static String	AGGRESSIVENESS	Influences how much data is moved at a time during rebalance.
static String	COMPACT_AFTER_REBALANCE	Perform compaction of deleted records once the rebalance completes to reclaim memory and disk space.
static String	COMPACT_ONLY	If set to TRUE, ignore rebalance options and attempt to perform compaction of deleted records to reclaim memory and disk space without rebalancing first.
static String	FALSE
static String	REBALANCE_SHARDED_DATA	If TRUE, sharded data will be rebalanced approximately equally across the cluster.
static String	REBALANCE_UNSHARDED_DATA	If TRUE, unsharded data (a.k.a.
static String	REPAIR_INCORRECTLY_SHARDED_DATA	Scans for any data sharded incorrectly and re-routes the data to the correct location.
static String	TABLE_EXCLUDES	Comma-separated list of unsharded table names to not rebalance.
static String	TABLE_INCLUDES	Comma-separated list of unsharded table names to rebalance.
static String	TRUE

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

REBALANCE_SHARDED_DATA

public static final String REBALANCE_SHARDED_DATA

If TRUE, sharded data will be rebalanced approximately equally across the cluster. Note that for clusters with large amounts of sharded data, this data transfer could be time consuming and result in delayed query responses. Supported values:

• TRUE
• FALSE

The default value is TRUE.

See Also:

Constant Field Values

TRUE

public static final String TRUE

See Also:

Constant Field Values

FALSE

public static final String FALSE

See Also:

Constant Field Values

REBALANCE_UNSHARDED_DATA

public static final String REBALANCE_UNSHARDED_DATA

If TRUE, unsharded data (a.k.a. randomly-sharded) will be rebalanced approximately equally across the cluster. Note that for clusters with large amounts of unsharded data, this data transfer could be time consuming and result in delayed query responses. Supported values:

• TRUE
• FALSE

The default value is TRUE.

See Also:

Constant Field Values

TABLE_INCLUDES

public static final String TABLE_INCLUDES

Comma-separated list of unsharded table names to rebalance. Not applicable to sharded tables because they are always rebalanced. Cannot be used simultaneously with TABLE_EXCLUDES. This parameter is ignored if REBALANCE_UNSHARDED_DATA is FALSE.

See Also:

Constant Field Values

TABLE_EXCLUDES

public static final String TABLE_EXCLUDES

Comma-separated list of unsharded table names to not rebalance. Not applicable to sharded tables because they are always rebalanced. Cannot be used simultaneously with TABLE_INCLUDES. This parameter is ignored if REBALANCE_UNSHARDED_DATA is FALSE.

See Also:

Constant Field Values

AGGRESSIVENESS

public static final String AGGRESSIVENESS

Influences how much data is moved at a time during rebalance. A higher AGGRESSIVENESS will complete the rebalance faster. A lower AGGRESSIVENESS will take longer but allow for better interleaving between the rebalance and other queries. Valid values are constants from 1 (lowest) to 10 (highest). The default value is '10'.

See Also:

Constant Field Values

COMPACT_AFTER_REBALANCE

public static final String COMPACT_AFTER_REBALANCE

Perform compaction of deleted records once the rebalance completes to reclaim memory and disk space. Default is TRUE, unless REPAIR_INCORRECTLY_SHARDED_DATA is set to TRUE. Supported values:

• TRUE
• FALSE

The default value is TRUE.

See Also:

Constant Field Values

COMPACT_ONLY

public static final String COMPACT_ONLY

If set to TRUE, ignore rebalance options and attempt to perform compaction of deleted records to reclaim memory and disk space without rebalancing first. Supported values:

• TRUE
• FALSE

The default value is FALSE.

See Also:

Constant Field Values

REPAIR_INCORRECTLY_SHARDED_DATA

public static final String REPAIR_INCORRECTLY_SHARDED_DATA

Scans for any data sharded incorrectly and re-routes the data to the correct location. Only necessary if GPUdb.adminVerifyDb reports an error in sharding alignment. This can be done as part of a typical rebalance after expanding the cluster or in a standalone fashion when it is believed that data is sharded incorrectly somewhere in the cluster. Compaction will not be performed by default when this is enabled. If this option is set to TRUE, the time necessary to rebalance and the memory used by the rebalance may increase. Supported values:

• TRUE
• FALSE

The default value is FALSE.

See Also:

Constant Field Values