Package com.linkedin.venice.fastclient

Class DualReadAvroGenericStoreClient<K,V>

java.lang.Object

com.linkedin.venice.fastclient.InternalAvroStoreClient<K,V>

com.linkedin.venice.fastclient.DelegatingAvroStoreClient<K,V>

com.linkedin.venice.fastclient.DualReadAvroGenericStoreClient<K,V>

All Implemented Interfaces:

AvroGenericReadComputeStoreClient<K,V>, AvroGenericStoreClient<K,V>, Closeable, AutoCloseable

Direct Known Subclasses:

DualReadAvroSpecificStoreClient

public class DualReadAvroGenericStoreClient<K,V>
extends DelegatingAvroStoreClient<K,V>

The following class has capability to send dual read requests via Fast-client and Thin-client. 1. If both of them succeed, return the faster one. 2. If one of them fails, return the succeeded one. 3. If both of them fail, throw exception. Currently, this implementation only supports dual-read for single-get and batch-get requests. Compute requests have not been implemented for two reasons: 1. We prefer to do a gradual ramp of the feature as dual reads can lead to extra load on the storage nodes 2. The complexity of implementing dual reads for compute is higher and needs extra work to convert a StreamingCallback into a Future.

Constructor Summary

Constructors

Modifier	Constructor	Description
	DualReadAvroGenericStoreClient(InternalAvroStoreClient<K,V> delegate, ClientConfig config)
protected	DualReadAvroGenericStoreClient(InternalAvroStoreClient<K,V> delegate, ClientConfig config, AvroGenericStoreClient<K,V> thinClient)

Method Summary

Modifier and Type	Method	Description
CompletableFuture<Map<K,V>>	batchGet(BatchGetRequestContext<K,V> requestContext, Set<K> keys)
protected CompletableFuture<V>	get(GetRequestContext requestContext, K key)	TODO both super.get(key) and super.get(ctx,key) fetches non map for vsonClient for the first request.

Methods inherited from class com.linkedin.venice.fastclient.DelegatingAvroStoreClient

close, compute, compute, getClientConfig, getKeySchema, getLatestValueSchema, getSchemaReader, getStoreName, start, streamingBatchGet

Methods inherited from class com.linkedin.venice.fastclient.InternalAvroStoreClient

batchGet, compute, computeWithKeyPrefixFilter, get, isProjectionFieldValidationEnabled, streamingBatchGet, streamingBatchGet, streamingBatchGet

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.linkedin.venice.client.store.AvroGenericReadComputeStoreClient

compute, compute, compute

Methods inherited from interface com.linkedin.venice.client.store.AvroGenericStoreClient

get

Constructor Details

DualReadAvroGenericStoreClient

public DualReadAvroGenericStoreClient(InternalAvroStoreClient<K,V> delegate,
 ClientConfig config)

DualReadAvroGenericStoreClient

protected DualReadAvroGenericStoreClient(InternalAvroStoreClient<K,V> delegate,
 ClientConfig config,
 AvroGenericStoreClient<K,V> thinClient)

Method Details

get

protected CompletableFuture<V> get(GetRequestContext requestContext,
 K key)
                            throws VeniceClientException

TODO both super.get(key) and super.get(ctx,key) fetches non map for vsonClient for the first request. Needs to be investigated

Overrides:

get in class DelegatingAvroStoreClient<K,V>

Throws:

VeniceClientException

batchGet

public CompletableFuture<Map<K,V>> batchGet(BatchGetRequestContext<K,V> requestContext,
 Set<K> keys)
                                     throws VeniceClientException

Overrides:

batchGet in class InternalAvroStoreClient<K,V>

Throws:

VeniceClientException