ivoson commented on code in PR #39459: URL: https://github.com/apache/spark/pull/39459#discussion_r1100333545
########## core/src/main/scala/org/apache/spark/storage/BlockManagerMasterEndpoint.scala: ########## @@ -77,6 +77,11 @@ class BlockManagerMasterEndpoint( // Mapping from block id to the set of block managers that have the block. private val blockLocations = new JHashMap[BlockId, mutable.HashSet[BlockManagerId]] + // Mapping from task id to the set of rdd blocks which are generated from the task. + private val tidToRddBlockIds = new mutable.HashMap[Long, mutable.HashSet[RDDBlockId]] + // Record the visible RDD blocks which have been generated at least from one successful task. + private val visibleRDDBlocks = new mutable.HashSet[RDDBlockId] Review Comment: Let me explain this further. If we track visible blocks, it's clear that we always know which blocks are visible. If we track invisible blocks, the way we consider a block as visible is that at least one block exists and it's not in invisible lists. So if the existing blocks got lost, we will lose the information. Next time the cache is re-computed, we will do this again(firstly put it into invisible lists, then promote it to visible by removing it from invisible list once task finished successfully). And after doing the process again, the cache would be visible then. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
