Corrupted Shuffle Blocks

Corrupted Shuffle Blocks are generally rare and most commonly indicate a hardware level problem. If you see a lot of Block shuffle_[somenumbershere] is corrupted but the cause is unknown the next step is to see if they're all coming from the same host. You can do this by grepping the driver stderr log for FetchFailed(BlockManagerId( and if the hostname of the block manger is the same (note: there may be different block manager ids) then that host is likely the problematic host.

For example in 24/09/25 00:21:37 WARN task-result-getter-0 TaskSetManager: Lost task 613.0 in stage 1.0 (TID 12901) (fetching-host-name.internal executor 42): FetchFailed(BlockManagerId(420, serving-host-name.internal, 7337, None), shuffleId=0, mapIndex=11187, mapId=11187, reduceId=613, message= the host we are concerned about is the serving-host-name.internal. At this point you'll need to work with your cluster administrator to remove that host. If you're running on EC2 (or another cloud) you may also need to create a ticket with upstream so that the node (once removed) is not added back from auto-scaling.