turboFei commented on a change in pull request #24533: [SPARK-27637] For
nettyBlockTransferService, when exception occurred when fetching data, check
whether relative executor is alive before retry
URL: https://github.com/apache/spark/pull/24533#discussion_r281271873
##########
File path:
core/src/main/scala/org/apache/spark/network/netty/NettyBlockTransferService.scala
##########
@@ -117,11 +125,26 @@ private[spark] class NettyBlockTransferService(
}
}
+ val executorAliveChecker = new RetryingBlockFetcher.ExecutorAliveChecker
{
+ override def check(): Boolean = {
Review comment:
> how expensive is it?
It would be invoked only after the IOException corrupted, so the frequency
is not high.
For the driver, it only check whether a executorId is contained in a map
with O(1) constant time.
For the executor, its cost is a rpc request with driver, which is not
expensive .
@cloud-fan
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