prakharjain09 commented on a change in pull request #27864: [SPARK-20732][CORE]
Decommission cache blocks to other executors when an executor is decommissioned
URL: https://github.com/apache/spark/pull/27864#discussion_r404118861
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File path: core/src/main/scala/org/apache/spark/storage/BlockManager.scala
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@@ -1829,7 +1897,49 @@ private[spark] class BlockManager(
data.dispose()
}
+ /**
+ * Class to handle block manager decommissioning retries
+ * It creates a Thread to retry offloading all RDD cache blocks
+ */
+ private class BlockManagerDecommissionManager {
+ @volatile private var stopped = false
+ private val cacheReplicationThread = new Thread {
Review comment:
When all the blocks are done migrating - Driver will automatically know.
BlockManagerMaster is continuously receiving BlockUpdates. So when all blocks
are offloaded - Dynamic allocation will atomatically know that this executor
doesn't have cache data and If other criteria are met (like executorIdleTimeout
etc), then the executor will automatically be removed by ExecutorMonitor class
of DynamicAllocation.
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