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https://issues.apache.org/jira/browse/SPARK-33864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ramesha Bhatta updated SPARK-33864:
-----------------------------------
Description:
How can we have single JVM or few JVM process submit multiple application to
cluster.
It is observed that each spark-submit opens upto 400 JARS of >1GB size and
creates _spark_conf_XXXX.zip in /tmp and copy under application specific
.staging directory. When run concurrently for # of JVMs that can be
supported in a server is limited and 100% CPU during job submission and until
client java processes start exiting.
Initially we thought creating zip files and distributing this to hdfs for each
application is the source of issue. However reducing the size of zipfile by 50%
also we didn't see much difference and indicates the main source of issue is
number of JAVA process on client side.
Direct impact is any submission with concurrency >40 (#of hyperthreaded cores)
leads to failure and CPU overload on GW. Tried Livy, however noticed, in the
background this solution also does a spark-submit and same problem persists and
getting "response code 404" and observe the same CPU overload on server running
livy. The concurrency is due to mini-batches over REST and expecting and try to
support 2000+ concurrent requests as long as we have the resource to support in
the cluster. For this spark-submit is the major bottleneck because of the
explained situation. For JARS submission, we have more than one work-around
(1.pre-distribute the jars to a specified folder and refer local keyword or 2)
stage the JARS in a HDFS location and specify HDFS reference thus no file-copy
per application).
Is there a way to create a service/services that will stay running and submit
jobs to cluster. For running application in Client mode make sense to open 400+
jars, however just for sumibtting the application to cluster we could have a
simple/lite process that runs as service.
Regards,
-Ramesh
was:
How can we have single JVM or few JVM process submit multiple application to
cluster.
It is observed that each spark-submit opens upto 400 JARS of >1GB size and
creates __spark_conf__XXXX.zip in /tmp and copy under application specific
.staging directory. When run concurrently for # of JVMs that can be
supported in a server is limited and submit alone takes
In our use-case, literally millions of time creation of this zip file before
any actual change in configuration is not efficient and there should have been
an option to create this on need basis and option to re-use (cache).
Direct impact is any submission with concurrency >40 (#of hyperthreaded cores)
leads to failure and CPU overload on GW. Tried Livy, however noticed, in the
background this solution also does a spark-submit and same problem persists and
getting "response code 404" and observe the same CPU overload on server running
livy. The concurrency is due to mini-batches over REST and expecting and try to
support 2000+ concurrent requests as long as we have the resource to support in
the cluster. For this spark-submit is the major bottleneck because of the
explained situation. For JARS submission, we have more than one work-around
(1.pre-distribute the jars to a specified folder and refer local keyword or 2)
stage the JARS in a HDFS location and specify HDFS reference thus no file-copy
per application).
Looking at the code yarn/Client.scala, it appeared possible to make change in
the spark-submit and thus raising a enhancement request.
Please prioritize.
I guess, the change needed is in
[https://github.com/apache/spark/blob/48f93af9f3d40de5bf087eb1a06c1b9954b2ad76/resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala]
line 745 ( "val confArchive = File.createTempFile(LOCALIZED_CONF_DIR, ".zip",
new File(Utils.getLocalDir(sparkConf))) )....
Adding some logic like the last time the file created/file-existence etc. and
avoid re-creating again repetitively/excessively is right thing to do.
Second change is avoid distributing this for every application and reuse from
shared HDFS location.
==
// Upload the conf archive to HDFS manually, and record its location in the
configuration.
// This will allow the AM to know where the conf archive is in HDFS, so that
it can be
// distributed to the containers.
//
// This code forces the archive to be copied, so that unit tests pass (since
in that case both
// file systems are the same and the archive wouldn't normally be copied). In
most (all?)
// deployments, the archive would be copied anyway, since it's a temp file in
the local file
// system.
val remoteConfArchivePath = new Path(destDir, LOCALIZED_CONF_ARCHIVE)
val remoteFs = FileSystem.get(remoteConfArchivePath.toUri(), hadoopConf)
cachedResourcesConf.set(CACHED_CONF_ARCHIVE, remoteConfArchivePath.toString())
val localConfArchive = new Path(createConfArchive().toURI())
copyFileToRemote(destDir, localConfArchive, replication, symlinkCache, force =
true,
destName = Some(LOCALIZED_CONF_ARCHIVE))
===
Regards,
-Ramesh
> How can we submit or initiate multiple spark application with single or few
> JVM
> -------------------------------------------------------------------------------
>
> Key: SPARK-33864
> URL: https://issues.apache.org/jira/browse/SPARK-33864
> Project: Spark
> Issue Type: Improvement
> Components: Deploy
> Affects Versions: 2.4.5
> Reporter: Ramesha Bhatta
> Priority: Major
>
> How can we have single JVM or few JVM process submit multiple application to
> cluster.
> It is observed that each spark-submit opens upto 400 JARS of >1GB size and
> creates _spark_conf_XXXX.zip in /tmp and copy under application specific
> .staging directory. When run concurrently for # of JVMs that can be
> supported in a server is limited and 100% CPU during job submission and
> until client java processes start exiting.
> Initially we thought creating zip files and distributing this to hdfs for
> each application is the source of issue. However reducing the size of zipfile
> by 50% also we didn't see much difference and indicates the main source of
> issue is number of JAVA process on client side.
> Direct impact is any submission with concurrency >40 (#of hyperthreaded
> cores) leads to failure and CPU overload on GW. Tried Livy, however noticed,
> in the background this solution also does a spark-submit and same problem
> persists and getting "response code 404" and observe the same CPU overload on
> server running livy. The concurrency is due to mini-batches over REST and
> expecting and try to support 2000+ concurrent requests as long as we have the
> resource to support in the cluster. For this spark-submit is the major
> bottleneck because of the explained situation. For JARS submission, we have
> more than one work-around (1.pre-distribute the jars to a specified folder
> and refer local keyword or 2) stage the JARS in a HDFS location and specify
> HDFS reference thus no file-copy per application).
> Is there a way to create a service/services that will stay running and submit
> jobs to cluster. For running application in Client mode make sense to open
> 400+ jars, however just for sumibtting the application to cluster we could
> have a simple/lite process that runs as service.
> Regards,
> -Ramesh
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