org.elasticsearch.gateway

クラス AsyncShardFetch<T extends BaseNodeResponse>

java.lang.Object

org.elasticsearch.gateway.AsyncShardFetch<T>

すべての実装されたインタフェース:

AutoCloseable, Releasable

public abstract class AsyncShardFetch<T extends BaseNodeResponse>
extends Object
implements Releasable

Allows to asynchronously fetch shard related data from other nodes for allocation, without blocking the cluster update thread.

The async fetch logic maintains a map of which nodes are being fetched from in an async manner, and once the results are back, it makes sure to schedule a reroute to make sure those results will be taken into account.

ネストされたクラスのサマリー

ネストされたクラス

修飾子とタイプ	クラスと説明
static class	AsyncShardFetch.FetchResult<T extends BaseNodeResponse> The result of a fetch operation.
static interface	AsyncShardFetch.List<NodesResponse extends BaseNodesResponse<NodeResponse>,NodeResponse extends BaseNodeResponse> An action that lists the relevant shard data that needs to be fetched.

フィールドのサマリー

フィールド

修飾子とタイプ	フィールドと説明
protected ESLogger	logger
protected String	type

コンストラクタのサマリー

コンストラクタ

修飾子	コンストラクタと説明
protected	AsyncShardFetch(ESLogger logger, String type, ShardId shardId, AsyncShardFetch.List<? extends BaseNodesResponse<T>,T> action)

メソッドのサマリー

修飾子とタイプ	メソッドと説明
void	close()
AsyncShardFetch.FetchResult<T>	fetchData(DiscoveryNodes nodes, MetaData metaData, Set<String> ignoreNodes) Fetches the data for the relevant shard.
int	getNumberOfInFlightFetches() Returns the number of async fetches that are currently ongoing.
protected void	processAsyncFetch(ShardId shardId, T[] responses, FailedNodeException[] failures) Called by the response handler of the async action to fetch data.
protected abstract void	reroute(ShardId shardId, String reason) Implement this in order to scheduled another round that causes a call to fetch data.

クラスから継承されたメソッド java.lang.Object

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

フィールドの詳細

logger

protected final ESLogger logger

type

protected final String type

コンストラクタの詳細

AsyncShardFetch

protected AsyncShardFetch(ESLogger logger,
                          String type,
                          ShardId shardId,
                          AsyncShardFetch.List<? extends BaseNodesResponse<T>,T> action)

メソッドの詳細

close

public void close()

定義:

close インタフェース内 AutoCloseable

定義:

close インタフェース内 Releasable

getNumberOfInFlightFetches

public int getNumberOfInFlightFetches()

Returns the number of async fetches that are currently ongoing.

fetchData

public AsyncShardFetch.FetchResult<T> fetchData(DiscoveryNodes nodes,
                                                MetaData metaData,
                                                Set<String> ignoreNodes)

Fetches the data for the relevant shard. If there any ongoing async fetches going on, or new ones have been initiated by this call, the result will have no data.

The ignoreNodes are nodes that are supposed to be ignored for this round, since fetching is async, we need to keep them around and make sure we add them back when all the responses are fetched and returned.

processAsyncFetch

protected void processAsyncFetch(ShardId shardId,
                                 T[] responses,
                                 FailedNodeException[] failures)

Called by the response handler of the async action to fetch data. Verifies that its still working on the same cache generation, otherwise the results are discarded. It then goes and fills the relevant data for the shard (response + failures), issueing a reroute at the end of it to make sure there will be another round of allocations taking this new data into account.

reroute

protected abstract void reroute(ShardId shardId,
                                String reason)

Implement this in order to scheduled another round that causes a call to fetch data.