Yeachan Park created SPARK-42737:
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Summary: Shuffle files lost with graceful decommission fallback
storage enabled
Key: SPARK-42737
URL: https://issues.apache.org/jira/browse/SPARK-42737
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 3.3.2
Reporter: Yeachan Park
During testing of graceful decommissioning, the driver logs indicate that
shuffle files were lost:
{code:bash}
23/03/09 15:22:42 INFO KubernetesClusterSchedulerBackend: Decommission
executors: 3
23/03/09 15:22:42 INFO BlockManagerMasterEndpoint: Mark BlockManagers
(BlockManagerId(3, 100.96.5.11, 44707, None)) as being decommissioning.
23/03/09 15:22:42 WARN
KubernetesClusterSchedulerBackend$KubernetesDriverEndpoint: Received executor 1
decommissioned message
23/03/09 15:22:42 INFO KubernetesClusterSchedulerBackend: Decommission
executors: 1
23/03/09 15:22:42 INFO BlockManagerMasterEndpoint: Mark BlockManagers
(BlockManagerId(1, 100.96.5.9, 44491, None)) as being decommissioning.
23/03/09 15:22:42 WARN
KubernetesClusterSchedulerBackend$KubernetesDriverEndpoint: Received executor 2
decommissioned message
23/03/09 15:22:42 INFO KubernetesClusterSchedulerBackend: Decommission
executors: 2
23/03/09 15:22:42 INFO BlockManagerMasterEndpoint: Mark BlockManagers
(BlockManagerId(2, 100.96.5.10, 39011, None)) as being decommissioning.
23/03/09 15:22:44 ERROR TaskSchedulerImpl: Lost executor 3 on 100.96.5.11:
Executor decommission.
23/03/09 15:22:44 INFO ExecutorMonitor: Executor 3 is removed. Remove reason
statistics: (gracefully decommissioned: 1, decommision unfinished: 0, driver
killed: 0, unexpectedly exited: 0).
23/03/09 15:22:44 INFO DAGScheduler: Executor lost: 3 (epoch 0)
23/03/09 15:22:44 ERROR TaskSchedulerImpl: Lost executor 1 on 100.96.5.9:
Executor decommission.
23/03/09 15:22:44 INFO ExecutorMonitor: Executor 1 is removed. Remove reason
statistics: (gracefully decommissioned: 2, decommision unfinished: 0, driver
killed: 0, unexpectedly exited: 0).
23/03/09 15:22:44 ERROR TaskSchedulerImpl: Lost executor 2 on 100.96.5.10:
Executor decommission.
23/03/09 15:22:44 INFO BlockManagerMasterEndpoint: Trying to remove executor 3
from BlockManagerMaster.
23/03/09 15:22:44 INFO ExecutorMonitor: Executor 2 is removed. Remove reason
statistics: (gracefully decommissioned: 3, decommision unfinished: 0, driver
killed: 0, unexpectedly exited: 0).
23/03/09 15:22:44 INFO BlockManagerMasterEndpoint: Removing block manager
BlockManagerId(3, 100.96.5.11, 44707, None)
23/03/09 15:22:44 INFO BlockManagerMaster: Removed 3 successfully in
removeExecutor
23/03/09 15:22:44 INFO DAGScheduler: Shuffle files lost for executor: 3 (epoch
0)
23/03/09 15:22:44 INFO DAGScheduler: Executor lost: 1 (epoch 1)
23/03/09 15:22:45 INFO BlockManagerMasterEndpoint: Trying to remove executor 1
from BlockManagerMaster.
23/03/09 15:22:45 INFO BlockManagerMasterEndpoint: Removing block manager
BlockManagerId(1, 100.96.5.9, 44491, None)
23/03/09 15:22:45 INFO BlockManagerMaster: Removed 1 successfully in
removeExecutor
23/03/09 15:22:45 INFO DAGScheduler: Shuffle files lost for executor: 1 (epoch
1)
23/03/09 15:22:45 INFO DAGScheduler: Executor lost: 2 (epoch 2)
23/03/09 15:22:45 INFO BlockManagerMasterEndpoint: Trying to remove executor 2
from BlockManagerMaster.
23/03/09 15:22:45 INFO BlockManagerMasterEndpoint: Removing block manager
BlockManagerId(2, 100.96.5.10, 39011, None)
23/03/09 15:22:45 INFO BlockManagerMaster: Removed 2 successfully in
removeExecutor
23/03/09 15:22:45 INFO DAGScheduler: Shuffle files lost for executor: 2 (epoch
2)
23/03/09 15:22:52 INFO BlockManagerMaster: Removal of executor 1 requested
23/03/09 15:22:52 INFO
KubernetesClusterSchedulerBackend$KubernetesDriverEndpoint: Asked to remove
non-existent executor 1
{code}
The decommission logs from the executor also seems to indicate that no shuffle
data was necessary to migrate:
{code:java}
23/03/09 15:22:42 INFO CoarseGrainedExecutorBackend: Decommission executor 1.
23/03/09 15:22:42 INFO CoarseGrainedExecutorBackend: Will exit when finished
decommissioning
23/03/09 15:22:42 INFO BlockManager: Starting block manager decommissioning
process...
23/03/09 15:22:43 INFO CoarseGrainedExecutorBackend: Checking to see if we can
shutdown.
23/03/09 15:22:43 INFO CoarseGrainedExecutorBackend: No running tasks, checking
migrations
23/03/09 15:22:43 INFO CoarseGrainedExecutorBackend: All blocks not yet
migrated.
23/03/09 15:22:43 INFO BlockManagerDecommissioner: Starting block migration
23/03/09 15:22:43 INFO BlockManagerDecommissioner: Attempting to migrate all
RDD blocks
23/03/09 15:22:43 INFO BlockManagerDecommissioner: Attempting to migrate all
shuffle blocks
23/03/09 15:22:43 INFO BlockManagerDecommissioner: Start refreshing migratable
shuffle blocks
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Attempting to migrate all
cached RDD blocks
23/03/09 15:22:44 INFO BlockManagerDecommissioner: 0 of 0 local shuffles are
added. In total, 0 shuffles are remained.
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Starting shuffle block
migration thread for BlockManagerId(fallback, remote, 7337, None)
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Finished current round
refreshing migratable shuffle blocks, waiting for 30000ms before the next round
refreshing.
23/03/09 15:22:44 WARN BlockManagerDecommissioner: Asked to decommission RDD
cache blocks, but no blocks to migrate
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Finished current round RDD
blocks migration, waiting for 30000ms before the next round migration.
23/03/09 15:22:44 INFO CoarseGrainedExecutorBackend: Checking to see if we can
shutdown.
23/03/09 15:22:44 INFO CoarseGrainedExecutorBackend: No running tasks, checking
migrations
23/03/09 15:22:44 INFO CoarseGrainedExecutorBackend: No running tasks, all
blocks migrated, stopping.
23/03/09 15:22:44 INFO CoarseGrainedExecutorBackend: Executor self-exiting due
to : Finished decommissioning
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Stop RDD blocks migration().
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Stop refreshing migratable
shuffle blocks.
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Stopping migrating shuffle
blocks.
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Stopped block migration
23/03/09 15:22:44 INFO BlockManagerDecommissioner: Stop shuffle block
migration().
{code}
This seems incorrect as there were no shuffle files to migrate to begin with.
We enabled:
- spark.decommission.enabled
- spark.storage.decommission.rddBlocks.enabled
- spark.storage.decommission.shuffleBlocks.enabled
- spark.storage.decommission.enabled
and set spark.storage.decommission.fallbackStorage.path to a path in our bucket.
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