Gentle reminder!!!
Br,
-Mohan Patidar
From: Patidar, Mohanlal (Nokia - IN/Bangalore)
Sent: Tuesday, January 18, 2022 2:02 PM
To: user@spark.apache.org
Cc: Rao, Abhishek (Nokia - IN/Bangalore) <abhishek....@nokia.com>; Gowda Tp,
Thimme (Nokia - IN/Bangalore) <thimme.gowda...@nokia.com>; Sharma, Prakash
(Nokia - IN/Bangalore) <prakash.sha...@nokia.com>; Tarun, N (Nokia -
IN/Bangalore) <n.ta...@nokia.com>; Badagandi, Srinivas B. (Nokia -
IN/Bangalore) <srinivas.b.badaga...@nokia.com>
Subject: Regarding spark-3.2.0 decommission features.
Hi,
We're using Spark 3.2.0 and we have enabled the spark decommission
feature. As part of validating this feature, we wanted to check if the rdd
blocks and shuffle blocks from the decommissioned executors are migrated to
other executors.
However, we could not see this happening. Below is the configuration we used.
1. Spark Configuration used:
spark.local.dir /mnt/spark-ldir
spark.decommission.enabled true
spark.storage.decommission.enabled true
spark.storage.decommission.rddBlocks.enabled true
spark.storage.decommission.shuffleBlocks.enabled true
spark.dynamicAllocation.enabled true
2. Brought up spark-driver and executors on the different nodes.
NAME
READY STATUS NODE
decommission-driver
1/1 Running Node1
gzip-compression-test-ae0b0b7e4d7fbe40-exec-1 1/1
Running Node1
gzip-compression-test-ae0b0b7e4d7fbe40-exec-2 1/1
Running Node2
gzip-compression-test-ae0b0b7e4d7fbe40-exec-3 1/1
Running Node1
gzip-compression-test-ae0b0b7e4d7fbe40-exec-4 1/1
Running Node2
gzip-compression-test-ae0b0b7e4d7fbe40-exec-5 1/1
Running Node1
3. Bringdown Node2 so status of pods as are following.
NAME
READY STATUS NODE
decommission-driver
1/1 Running Node1
gzip-compression-test-ae0b0b7e4d7fbe40-exec-1 1/1
Running Node1
gzip-compression-test-ae0b0b7e4d7fbe40-exec-2 1/1
Terminating Node2
gzip-compression-test-ae0b0b7e4d7fbe40-exec-3 1/1
Running Node1
gzip-compression-test-ae0b0b7e4d7fbe40-exec-4 1/1
Terminating Node2
gzip-compression-test-ae0b0b7e4d7fbe40-exec-5 1/1
Running Node1
4. Driver logs:
{"type":"log", "level":"INFO", "time":"2022-01-12T08:55:28.296Z",
"timezone":"UTC", "log":"Adding decommission script to lifecycle"}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:55:28.459Z",
"timezone":"UTC", "log":"Adding decommission script to lifecycle"}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:55:28.564Z",
"timezone":"UTC", "log":"Adding decommission script to lifecycle"}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:55:28.601Z",
"timezone":"UTC", "log":"Adding decommission script to lifecycle"}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:55:28.667Z",
"timezone":"UTC", "log":"Adding decommission script to lifecycle"}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:58:21.885Z",
"timezone":"UTC", "log":"Notify executor 5 to decommissioning."}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:58:21.887Z",
"timezone":"UTC", "log":"Notify executor 1 to decommissioning."}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:58:21.887Z",
"timezone":"UTC", "log":"Notify executor 3 to decommissioning."}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:58:21.887Z",
"timezone":"UTC", "log":"Mark BlockManagers (BlockManagerId(5, X.X.X.X, 33359,
None), BlockManagerId(1, X.X.X.X, 38655, None), BlockManagerId(3, X.X.X.X,
35797, None)) as being decommissioning."}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:59:24.426Z",
"timezone":"UTC", "log":"Executor 2 is removed. Remove reason statistics:
(gracefully decommissioned: 0, decommision unfinished: 0, driver killed: 0,
unexpectedly exited: 1)."}
{"type":"log", "level":"INFO", "time":"2022-01-12T08:59:24.426Z",
"timezone":"UTC", "log":"Executor 4 is removed. Remove reason statistics:
(gracefully decommissioned: 0, decommision unfinished: 0, driver killed: 0,
unexpectedly exited: 2)."}
5. Verified by Execute into all live executors(1,3,5) and checked at
location (/mnt/spark-ldir/) so only one blockManger id present, not seeing any
other blockManager id copied to this location.
Example:
$kubectl exec -it
gzip-compression-test-ae0b0b7e4d7fbe40-exec-1 -n test bash
$cd /mnt/spark-ldir/
$ blockmgr-60872c99-e7d6-43ba-a43e-a97fc9f619ca
Since the migration was not happening, we tried to use fallback storage option
by specifying the hdfs storage. But unfortunately we could not see the rdd and
shuffle blocks in this fallback storage location as well. Below is the
configuration we used.
1. Spark Configuration Used:
spark.decommission.enabled true
spark.storage.decommission.enabled true
spark.storage.decommission.rddBlocks.enabled true
spark.storage.decommission.shuffleBlocks.enabled true
spark.storage.decommission.fallbackStorage.path
hdfs://namenodeHA/tmp/fallbackstorage
spark.dynamicAllocation.enabled true
1. Brought up one spark-driver and one executor on the different nodes.
NAME READY
NODE
decommission-driver
1/1 Node1
gzip-compression-test-49acf67e679f9259-exec-1 1/1 Node2
3. Bringdown Node2 so status of pods as are following.
Example:
NAME
READY STATUS
decommission-driver
1/1 Running
gzip-compression-test-49acf67e679f9259-exec-1 1/1 Running
gzip-compression-test-49acf67e679f9259-exec-1 1/1 Running
gzip-compression-test-49acf67e679f9259-exec-1 1/1 Terminating
4. Verified data migration on that storage fallback location:
Example:
$ hdfs dfs -ls /tmp/fallbackstorage
Note: still empty this location.
5. Driver logs is here.
related to fallback
{"type":"log", "level":"INFO", "time":"2022-01-17T10:40:21.682Z",
"timezone":"UTC", "log":"Registering BlockManager BlockManagerId(fallback,
remote, 7337, None)"}
{"type":"log", "level":"INFO", "time":"2022-01-17T10:40:21.682Z",
"timezone":"UTC", "log":"Registering block manager remote:7337 with 0.0 B RAM,
BlockManagerId(fallback, remote, 7337, None)"}
{"type":"log", "level":"INFO", "time":"2022-01-17T10:40:21.682Z",
"timezone":"UTC", "log":"Registered BlockManager BlockManagerId(fallback,
remote, 7337, None)"}
related to decommissioning
{"type":"log", "level":"INFO", "time":"2022-01-17T10:40:21.661Z",
"timezone":"UTC", "log":"Adding decommission script to lifecycle"}
{"type":"log", "level":"INFO", "time":"2022-01-17T10:46:17.952Z",
"timezone":"UTC", "log":"Executor 1 is removed. Remove reason statistics:
(gracefully decommissioned: 0, decommision unfinished: 0, driver killed: 0,
unexpectedly exited: 1)."}
Please Let us know if we are missing anything which is stopping the migration
of rdd and shuffle blocks.
Thanks and Regards,
-Mohan Patidar
