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[GitHub] [spark] Ngone51 opened a new pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Ngone51 opened a new pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768
 
 
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   Update the document and shell script to warn user about the deprecation of multiple workers on the same host support.
   
   ### Why are the changes needed?
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   This is a sub-task of [SPARK-30978](https://issues.apache.org/jira/browse/SPARK-30978), which plans to totally remove support of multiple workers in Spark 3.1. This PR makes the first step to deprecate it firstly in Spark 3.0. 
   
   ### Does this PR introduce any user-facing change?
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   If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible.
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   Yeah, user see warning when they run start worker script.
   
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   Tested manually.
   

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Posted by GitBox <gi...@apache.org>.
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[GitHub] [spark] SparkQA commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-594012909
 
 
   **[Test build #119235 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/119235/testReport)** for PR 27768 at commit [`2f2e6a9`](https://github.com/apache/spark/commit/2f2e6a9d4257d218f91527601131acdc22a8855c).

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[GitHub] [spark] jiangxb1987 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
jiangxb1987 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-613859991
 
 
   retest this please

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[GitHub] [spark] SparkQA commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-613954569
 
 
   **[Test build #121308 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/121308/testReport)** for PR 27768 at commit [`0ed01a4`](https://github.com/apache/spark/commit/0ed01a41c002ab9d3d5707b166f7d3c525527314).
    * This patch passes all tests.
    * This patch merges cleanly.
    * This patch adds no public classes.

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[GitHub] [spark] jiangxb1987 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
jiangxb1987 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#discussion_r390756668
 
 

 ##########
 File path: docs/core-migration-guide.md
 ##########
 @@ -38,3 +38,5 @@ license: |
 - Event log file will be written as UTF-8 encoding, and Spark History Server will replay event log files as UTF-8 encoding. Previously Spark writes event log file as default charset of driver JVM process, so Spark History Server of Spark 2.x is needed to read the old event log files in case of incompatible encoding.
 
 - A new protocol for fetching shuffle blocks is used. It's recommended that external shuffle services be upgraded when running Spark 3.0 apps. Old external shuffle services can still be used by setting the configuration `spark.shuffle.useOldFetchProtocol` to `true`. Otherwise, Spark may run into errors with messages like `IllegalArgumentException: Unexpected message type: <number>`.
+
+- `SPARK_WORKER_INSTANCES` is deprecated. It's recommended to launch multiple executors in one worker and launch one worker per node instead of launching multiple workers per node and launching one executor per worker.
 
 Review comment:
   You should mention this is for Standalone backend only.

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[GitHub] [spark] Ngone51 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
Ngone51 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-611395658
 
 
   ping @jiangxb1987 

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URL: https://github.com/apache/spark/pull/27768#issuecomment-594530124
 
 
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Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-603213828
 
 
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[GitHub] [spark] jiangxb1987 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
jiangxb1987 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-595394827
 
 
   We should also update the migration guide to deprecate the env `SPARK_WORKER_INSTANCES`

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    * This patch adds no public classes.

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Ngone51 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-594011232
 
 
   retest this please.

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   retest this please.

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[GitHub] [spark] jiangxb1987 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

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jiangxb1987 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#discussion_r388499387
 
 

 ##########
 File path: docs/hardware-provisioning.md
 ##########
 @@ -66,7 +66,8 @@ Finally, note that the Java VM does not always behave well with more than 200 Gi
 purchase machines with more RAM than this, you can run _multiple worker JVMs per node_. In
 Spark's [standalone mode](spark-standalone.html), you can set the number of workers per node
 with the `SPARK_WORKER_INSTANCES` variable in `conf/spark-env.sh`, and the number of cores
-per worker with `SPARK_WORKER_CORES`.
+per worker with `SPARK_WORKER_CORES`. But please note that support of multiple workers on the
 
 Review comment:
   We should rewrite this paragraph to suggest launch multiple executors instead of mentioning multiple workers

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URL: https://github.com/apache/spark/pull/27768
 
 
   

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[GitHub] [spark] jiangxb1987 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
jiangxb1987 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#discussion_r390756919
 
 

 ##########
 File path: docs/hardware-provisioning.md
 ##########
 @@ -63,10 +63,10 @@ Note that memory usage is greatly affected by storage level and serialization fo
 the [tuning guide](tuning.html) for tips on how to reduce it.
 
 Finally, note that the Java VM does not always behave well with more than 200 GiB of RAM. If you
-purchase machines with more RAM than this, you can run _multiple worker JVMs per node_. In
-Spark's [standalone mode](spark-standalone.html), you can set the number of workers per node
-with the `SPARK_WORKER_INSTANCES` variable in `conf/spark-env.sh`, and the number of cores
-per worker with `SPARK_WORKER_CORES`.
+purchase machines with more RAM than this, you can launch multiple executors in a single node. In
+Spark's [standalone mode](spark-standalone.html), a worker is responsible for launching multiple
+executors according to its available memory and cores. And each executor will be launched in a
 
 Review comment:
   nit: `And` -> `and`

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URL: https://github.com/apache/spark/pull/27768#issuecomment-596528236
 
 
   ping @jiangxb1987 

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URL: https://github.com/apache/spark/pull/27768#issuecomment-594097695
 
 
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    * This patch **fails Spark unit tests**.
    * This patch merges cleanly.
    * This patch adds no public classes.

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[GitHub] [spark] jiangxb1987 commented on issue #27768: [SPARK-31018][CORE][DOCS] Deprecate support of multiple workers on the same host in Standalone

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jiangxb1987 commented on issue #27768: [SPARK-31018][CORE][DOCS] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-614205345
 
 
   Thanks, merged to master/3.0 !

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[GitHub] [spark] jiangxb1987 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
jiangxb1987 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#discussion_r388499978
 
 

 ##########
 File path: sbin/decommission-slave.sh
 ##########
 @@ -40,6 +40,7 @@ fi
 if [ "$SPARK_WORKER_INSTANCES" = "" ]; then
   "${SPARK_HOME}/sbin"/spark-daemon.sh decommission org.apache.spark.deploy.worker.Worker 1
 else
+  echo "WARNING: Support of multiple workers on the same host is deprecated in Spark 3.0 and is going to be removed in Spark 3.1."
 
 Review comment:
   I don't think this warning message is necessary, but we can consider add comment in the script to say the env `SPARK_WORKER_INSTANCES` is deprecated.

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[GitHub] [spark] Ngone51 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
Ngone51 commented on a change in pull request #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#discussion_r386878716
 
 

 ##########
 File path: sbin/start-slave.sh
 ##########
 @@ -86,6 +86,7 @@ function start_instance {
 if [ "$SPARK_WORKER_INSTANCES" = "" ]; then
   start_instance 1 "$@"
 else
+  echo "WARNING: Support of multiple workers on the same host is deprecated in Spark 3.0 and is going to be removed in Spark 3.1."
 
 Review comment:
   Do we expect to see such warning? @jiangxb1987 

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SparkQA commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-593906747
 
 
   **[Test build #119215 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/119215/testReport)** for PR 27768 at commit [`2f2e6a9`](https://github.com/apache/spark/commit/2f2e6a9d4257d218f91527601131acdc22a8855c).
    * This patch **fails Spark unit tests**.
    * This patch merges cleanly.
    * This patch adds no public classes.

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[GitHub] [spark] AmplabJenkins commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
AmplabJenkins commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-594013570
 
 
   Merged build finished. Test PASSed.

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[GitHub] [spark] AmplabJenkins commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
AmplabJenkins commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-609028259
 
 
   Test PASSed.
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[GitHub] [spark] AmplabJenkins removed a comment on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
AmplabJenkins removed a comment on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-611465482
 
 
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[GitHub] [spark] Ngone51 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
Ngone51 commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-609011129
 
 
   retest this please.

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[GitHub] [spark] AmplabJenkins commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone

Posted by GitBox <gi...@apache.org>.
AmplabJenkins commented on issue #27768: [SPARK-31018][CORE] Deprecate support of multiple workers on the same host in Standalone
URL: https://github.com/apache/spark/pull/27768#issuecomment-595688541
 
 
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