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## ParallelMerge

# Not available in Community Designer

Short Description
Ports
Metadata
Details
Compatibility
See also

### Short Description

ParallelMerge gathers data records from multiple CloverETL Cluster workers. The algorithm of the component is derived from the regular Merge component.

Component | Same input metadata | Sorted inputs | Inputs | Outputs | Java | CTL | Auto-propagated metadata
--- | --- | --- | --- | --- | --- | --- | ---
ParallelMerge |  |  | 1 [1] | 1 |  |  |
[1] The single input port represents multiple virtual input ports.

### Icon

### Ports

Port type | Number | Required | Description | Metadata
--- | --- | --- | --- | ---
Input | 0 |  | For input data records | Any
Output | 0 |  | For gathered data records | Input 0

### Metadata

ParallelMerge propagates metadata in both directions. The component does not change metadata priorities.

The component has no metadata template.

The component does not require any specific metadata fields on its ports.

### ParallelMerge Attributes

ParallelMerge has same attributes as Merge. See Merge Attributes.

### Details

ParallelMerge gathers data records from multiple CloverETL Cluster workers.

The algorithm of this component is derived from the regular Merge component. See the documentation of the Merge component for more details about attributes and other component specific behavior.

This component belongs to group of cluster components that allows the change from a multiple-workers allocation to a single-worker allocation. So the allocation of the component preceding the ParallelMerge component can provide multiple workers. The allocation of the component following the ParallelMerge component has to provide a single worker.

| Note
More details about usage of this component are available in the CloverETL Cluster documentation.

### Compatibility

#### 3.4

The component is available since version 3.4.

#### 4.3.0-M2

In 4.3.0-M2, ClusterMerge was renamed to ParallelMerge.

### See also

ParallelSimpleGather
ParallelSimpleCopy
ParallelLoadBalancingPartition
ParallelPartition
Merge
Common Properties of Components
Specific Attribute Types
Common Properties of Data Partitioning Components

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