BlockFetchingListener

= BlockFetchingListener

BlockFetchingListener is the <> of <> that want to be notified about <> and <>.

BlockFetchingListener is used when:

• storage:ShuffleClient.md#fetchBlocks[ShuffleClient], storage:BlockTransferService.md#fetchBlocks[BlockTransferService], storage:NettyBlockTransferService.md#fetchBlocks[NettyBlockTransferService], and storage:ExternalShuffleClient.md#fetchBlocks[ExternalShuffleClient] are requested to fetch a sequence of blocks

• BlockFetchStarter is requested to core:BlockFetchStarter.md#createAndStart[createAndStart]

• core:RetryingBlockFetcher.md[] and storage:OneForOneBlockFetcher.md[] are created

[[contract]] [source, java]

package org.apache.spark.network.shuffle;

interface BlockFetchingListener extends EventListener { void onBlockFetchSuccess(String blockId, ManagedBuffer data); void onBlockFetchFailure(String blockId, Throwable exception); }

.BlockFetchingListener Contract [cols="1,2",options="header",width="100%"] |=== | Method | Description

| onBlockFetchSuccess | [[onBlockFetchSuccess]] Used when...FIXME

| onBlockFetchFailure | [[onBlockFetchFailure]] Used when...FIXME |===

[[implementations]] .BlockFetchingListeners [cols="1,2",options="header",width="100%"] |=== | BlockFetchingListener | Description

| core:RetryingBlockFetcher.md#RetryingBlockFetchListener[RetryingBlockFetchListener] | [[RetryingBlockFetchListener]]

| "Unnamed" in storage:ShuffleBlockFetcherIterator.md#sendRequest[ShuffleBlockFetcherIterator] | [[ShuffleBlockFetcherIterator]]

| "Unnamed" in storage:BlockTransferService.md#fetchBlockSync[BlockTransferService] | [[BlockTransferService]] |===