Specify bottleneck for databricks cluster

alesventus — Wed, 11 Oct 2023 07:40:38 GMT

Hi, Im trying to find out what is bottleneck on cluster when running loading process.

Scenario: Loading CDC changes from sql server to Raw zone and merge changes into Bronze zone and then merge Bronze to Silver. All is orchestrated in data factory as a loop per table. Parallel run in data factory is set to 5. So max 5 tables and notebooks are running simultaneously.

Strange is that when process starts, first 25 minutes cluster is not performing merges and first 5 notebooks take about 25 minutes. Then, cluster is autoscaled from 2 to 6 workers and the rest 45 notebooks finish in 10 minutes.

I tried to set 6 workers to cluster and start it with startup job 10 minutes before the load, but the result was the same.

I can see there is peak of memory use on driver from the beginning, workers memory or cpu dont peak. So I believe that bottleneck is driver trying to spread work across the workers. Am I correct?

I attached screenshots from ganglia. First is state 10 minutes after start, second is state after 30 minutes and third is after autoscaling 35 minutes after start.

Thanks.

Re: Specify bottleneck for databricks cluster

Debayan — Thu, 12 Oct 2023 13:06:23 GMT

Hi, The load looks okay. If you see the maximum memory is free and not used (fresh lime colour and the colour index). Could you please send the driver logs to check on this further?

Re: Specify bottleneck for databricks cluster

alesventus — Fri, 13 Oct 2023 10:24:07 GMT

Logs are too long and txt is not supported. But here are some details:

stderr:

Unexpected internal error while setting REPL context in `pre_command_execute`: An error occurred while calling o375.getLocalProperty. Trace:
py4j.security.Py4JSecurityException: Method public java.lang.String org.apache.spark.api.java.JavaSparkContext.getLocalProperty(java.lang.String) is not whitelisted on class class org.apache.spark.api.java.JavaSparkContext
at py4j.security.WhitelistingPy4JSecurityManager.checkCall(WhitelistingPy4JSecurityManager.java:473)
at py4j.Gateway.invoke(Gateway.java:305)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.ClientServerConnection.waitForCommands(ClientServerConnection.java:195)
at py4j.ClientServerConnection.run(ClientServerConnection.java:115)
at java.lang.Thread.run(Thread.java:750)

stdout:

2023-10-10 07:01:53,801 metastoreChecker WARN RollingFileAppender 'publicFile.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:01:53,803 metastoreChecker WARN RollingFileAppender 'privateFile.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:01:53,803 metastoreChecker WARN RollingFileAppender 'com.databricks.UsageLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:01:53,804 metastoreChecker WARN RollingFileAppender 'com.databricks.ProductLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:01:53,805 metastoreChecker WARN RollingFileAppender 'com.databricks.LineageLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:01:53,805 metastoreChecker WARN RollingFileAppender 'com.databricks.MetricsLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:01:53,806 metastoreChecker WARN RollingFileAppender 'dltExecution.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10T07:04:47.535+0000: [GC (Allocation Failure) [PSYoungGen: 1785344K->82418K(1963520K)] 2550598K->847680K(6237184K), 0.0343345 secs] [Times: user=0.10 sys=0.00, real=0.04 secs]
2023-10-10 07:06:54,852 metastoreChecker WARN RollingFileAppender 'publicFile.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:06:54,853 metastoreChecker WARN RollingFileAppender 'privateFile.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:06:54,854 metastoreChecker WARN RollingFileAppender 'com.databricks.UsageLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:06:54,854 metastoreChecker WARN RollingFileAppender 'com.databricks.ProductLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:06:54,855 metastoreChecker WARN RollingFileAppender 'com.databricks.LineageLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:06:54,855 metastoreChecker WARN RollingFileAppender 'com.databricks.MetricsLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:06:54,856 metastoreChecker WARN RollingFileAppender 'dltExecution.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:11:55,928 metastoreChecker WARN RollingFileAppender 'publicFile.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:11:55,929 metastoreChecker WARN RollingFileAppender 'privateFile.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:11:55,930 metastoreChecker WARN RollingFileAppender 'com.databricks.UsageLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:11:55,931 metastoreChecker WARN RollingFileAppender 'com.databricks.ProductLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:11:55,931 metastoreChecker WARN RollingFileAppender 'com.databricks.LineageLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:11:55,932 metastoreChecker WARN RollingFileAppender 'com.databricks.MetricsLogging.appender': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10 07:11:55,932 metastoreChecker WARN RollingFileAppender 'dltExecution.rolling': The bufferSize is set to 8192 but bufferedIO is not true
2023-10-10T07:13:27.207+0000: [GC (Allocation Failure) [PSYoungGen: 1869298K->89868K(1959936K)] 2634560K->855139K(6233600K), 0.0350628 secs] [Times: user=0.11 sys=0.01, real=0.04 secs]

stdout:

CONF_DRIVER_JAVA_OPTS = -Djava.io.tmpdir=/local_disk0/tmp -XX:-OmitStackTraceInFastThrow -Djava.security.properties=/databricks/spark/dbconf/java/extra.security -XX:-UseContainerSupport -XX:+PrintFlagsFinal -XX:+PrintGCDateStamps -XX:+PrintGCDetails -verbose:gc -Xss4m -Djava.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni -Djavax.xml.datatype.DatatypeFactory=com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl -Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl -Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl -Djavax.xml.validation.SchemaFactory:http://www.w3.org/2001/XMLSchema=com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory -Dorg.xml.sax.driver=com.sun.org.apache.xerces.internal.parsers.SAXParser -Dorg.w3c.dom.DOMImplementationSourceList=com.sun.org.apache.xerces.internal.dom.DOMXSImplementationSourceImpl -Djavax.net.ssl.sessionCacheSize=10000 -Dscala.reflect.runtime.disable.typetag.cache=true -Dcom.google.cloud.spark.bigquery.repackaged.io.netty.tryReflectionSetAccessible=true -Dlog4j2.formatMsgNoLookups=true -Ddatabricks.serviceName=driver-1 -Xms6260m -Xmx6260m -Dspark.ui.port=40001
CONF_EXECUTOR_JAVA_OPTS = -Dspark.executor.extraJavaOptions="-Djava.io.tmpdir=/local_disk0/tmp -XX:ReservedCodeCacheSize=512m -XX:+UseCodeCacheFlushing -XX:PerMethodRecompilationCutoff=-1 -XX:PerBytecodeRecompilationCutoff=-1 -Djava.security.properties=/databricks/spark/dbconf/java/extra.security -XX:-UseContainerSupport -XX:+PrintFlagsFinal -XX:+PrintGCDateStamps -XX:+PrintGCDetails -verbose:gc -Xss4m -Djava.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni -Djavax.xml.datatype.DatatypeFactory=com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl -Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl -Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl -Djavax.xml.validation.SchemaFactory:http://www.w3.org/2001/XMLSchema=com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory -Dorg.xml.sax.driver=com.sun.org.apache.xerces.internal.parsers.SAXParser -Dorg.w3c.dom.DOMImplementationSourceList=com.sun.org.apache.xerces.internal.dom.DOMXSImplementationSourceImpl -Djavax.net.ssl.sessionCacheSize=10000 -Dscala.reflect.runtime.disable.typetag.cache=true -Dcom.google.cloud.spark.bigquery.repackaged.io.netty.tryReflectionSetAccessible=true -Dlog4j2.formatMsgNoLookups=true -Ddatabricks.serviceName=spark-executor-1" -Dspark.executor.memory=1821m
JAVA_OPTS = -Djava.io.tmpdir=/local_disk0/tmp -XX:-OmitStackTraceInFastThrow -Djava.security.properties=/databricks/spark/dbconf/java/extra.security -XX:-UseContainerSupport -XX:+PrintFlagsFinal -XX:+PrintGCDateStamps -XX:+PrintGCDetails -verbose:gc -Xss4m -Djava.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni -Djavax.xml.datatype.DatatypeFactory=com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl -Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl -Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl -Djavax.xml.validation.SchemaFactory:http://www.w3.org/2001/XMLSchema=com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory -Dorg.xml.sax.driver=com.sun.org.apache.xerces.internal.parsers.SAXParser -Dorg.w3c.dom.DOMImplementationSourceList=com.sun.org.apache.xerces.internal.dom.DOMXSImplementationSourceImpl -Djavax.net.ssl.sessionCacheSize=10000 -Dscala.reflect.runtime.disable.typetag.cache=true -Dcom.google.cloud.spark.bigquery.repackaged.io.netty.tryReflectionSetAccessible=true -Dlog4j2.formatMsgNoLookups=true -Ddatabricks.serviceName=driver-1 -Xms6260m -Xmx6260m -Dspark.ui.port=40001 -Dspark.executor.extraJavaOptions="-Djava.io.tmpdir=/local_disk0/tmp -XX:ReservedCodeCacheSize=512m -XX:+UseCodeCacheFlushing -XX:PerMethodRecompilationCutoff=-1 -XX:PerBytecodeRecompilationCutoff=-1 -Djava.security.properties=/databricks/spark/dbconf/java/extra.security -XX:-UseContainerSupport -XX:+PrintFlagsFinal -XX:+PrintGCDateStamps -XX:+PrintGCDetails -verbose:gc -Xss4m -Djava.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni -Djavax.xml.datatype.DatatypeFactory=com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl -Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl -Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl -Djavax.xml.validation.SchemaFactory:http://www.w3.org/2001/XMLSchema=com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory -Dorg.xml.sax.driver=com.sun.org.apache.xerces.internal.parsers.SAXParser -Dorg.w3c.dom.DOMImplementationSourceList=com.sun.org.apache.xerces.internal.dom.DOMXSImplementationSourceImpl -Djavax.net.ssl.sessionCacheSize=10000 -Dscala.reflect.runtime.disable.typetag.cache=true -Dcom.google.cloud.spark.bigquery.repackaged.io.netty.tryReflectionSetAccessible=true -Dlog4j2.formatMsgNoLookups=true -Ddatabricks.serviceName=spark-executor-1" -Dspark.executor.memory=1821m -Dspark.executor.extraClassPath=/databricks/hadoop-safety-jars/*:/databricks/spark/dbconf/log4j/executor:/databricks/spark/dbconf/jets3t/:/databricks/spark/dbconf/hadoop:/databricks/hive/conf:/databricks/jars/*
Using Spark master spark://10.250.21.11:7077
Tue Oct 10 05:56:07 UTC 2023
Starting driver
Driver command is /usr/lib/jvm/zulu8-ca-amd64/jre//bin/java -Djava.io.tmpdir=/local_disk0/tmp -XX:-OmitStackTraceInFastThrow -Djava.security.properties=/databricks/spark/dbconf/java/extra.security -XX:-UseContainerSupport -XX:+PrintFlagsFinal -XX:+PrintGCDateStamps -XX:+PrintGCDetails -verbose:gc -Xss4m -Djava.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni -Djavax.xml.datatype.DatatypeFactory=com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl -Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl -Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl -Djavax.xml.validation.SchemaFactory:http://www.w3.org/2001/XMLSchema=com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory -Dorg.xml.sax.driver=com.sun.org.apache.xerces.internal.parsers.SAXParser -Dorg.w3c.dom.DOMImplementationSourceList=com.sun.org.apache.xerces.internal.dom.DOMXSImplementationSourceImpl -Djavax.net.ssl.sessionCacheSize=10000 -Dscala.reflect.runtime.disable.typetag.cache=true -Dcom.google.cloud.spark.bigquery.repackaged.io.netty.tryReflectionSetAccessible=true -Dlog4j2.formatMsgNoLookups=true -Ddatabricks.serviceName=driver-1 -Xms6260m -Xmx6260m -Dspark.ui.port=40001 -Dspark.executor.extraJavaOptions="-Djava.io.tmpdir=/local_disk0/tmp -XX:ReservedCodeCacheSize=512m -XX:+UseCodeCacheFlushing -XX:PerMethodRecompilationCutoff=-1 -XX:PerBytecodeRecompilationCutoff=-1 -Djava.security.properties=/databricks/spark/dbconf/java/extra.security -XX:-UseContainerSupport -XX:+PrintFlagsFinal -XX:+PrintGCDateStamps -XX:+PrintGCDetails -verbose:gc -Xss4m -Djava.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni -Djavax.xml.datatype.DatatypeFactory=com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl -Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl -Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl -Djavax.xml.validation.SchemaFactory:http://www.w3.org/2001/XMLSchema=com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory -Dorg.xml.sax.driver=com.sun.org.apache.xerces.internal.parsers.SAXParser -Dorg.w3c.dom.DOMImplementationSourceList=com.sun.org.apache.xerces.internal.dom.DOMXSImplementationSourceImpl -Djavax.net.ssl.sessionCacheSize=10000 -Dscala.reflect.runtime.disable.typetag.cache=true -Dcom.google.cloud.spark.bigquery.repackaged.io.netty.tryReflectionSetAccessible=true -Dlog4j2.formatMsgNoLookups=true -Ddatabricks.serviceName=spark-executor-1" -Dspark.executor.memory=1821m -Dspark.executor.extraClassPath=/databricks/hadoop-safety-jars/*:/databricks/spark/dbconf/log4j/executor:/databricks/spark/dbconf/jets3t/:/databricks/spark/dbconf/hadoop:/databricks/hive/conf:/databricks/jars/* -cp /databricks/hadoop-safety-jars/*:/databricks/spark/dbconf/jets3t/:/databricks/spark/dbconf/log4j/driver:/databricks/hive/conf:/databricks/spark/dbconf/hadoop:/databricks/jars/* com.databricks.backend.daemon.driver.DriverDaemon &
Working directory is /databricks/driver
[Global flags]
intx ActiveProcessorCount = -1 {product}
uintx AdaptiveSizeDecrementScaleFactor = 4 {product}
uintx AdaptiveSizeMajorGCDecayTimeScale = 10 {product}
uintx AdaptiveSizePausePolicy = 0 {product}
uintx AdaptiveSizePolicyCollectionCostMargin = 50 {product}
uintx AdaptiveSizePolicyInitializingSteps = 20 {product}
uintx AdaptiveSizePolicyOutputInterval = 0 {product}
uintx AdaptiveSizePolicyWeight = 10 {product}
uintx AdaptiveSizeThroughPutPolicy = 0 {product}
uintx AdaptiveTimeWeight = 25 {product}
bool AdjustConcurrency = false {product}
bool AggressiveHeap = false {product}
bool AggressiveOpts = false {product}
intx AliasLevel = 3 {C2 product}
bool AlignVector = true {C2 product}
intx AllocateInstancePrefetchLines = 1 {product}
intx AllocatePrefetchDistance = 256 {product}
intx AllocatePrefetchInstr = 3 {product}
intx AllocatePrefetchLines = 3 {product}
intx AllocatePrefetchStepSize = 64 {product}
intx AllocatePrefetchStyle = 1 {product}
bool AllowJNIEnvProxy = false {product}
bool AllowNonVirtualCalls = false {product}
bool AllowParallelDefineClass = false {product}
bool AllowUserSignalHandlers = false {product}
bool AlwaysActAsServerClassMachine = false {product}
bool AlwaysCompileLoopMethods = false {product}
bool AlwaysLockClassLoader = false {product}

Re: Specify bottleneck for databricks cluster

Debayan — Mon, 16 Oct 2023 04:40:03 GMT

stdout and stderr looks okay, do you have the log4j to share? You can make a doc out of it and share the doc here.

Re: Specify bottleneck for databricks cluster

alesventus — Mon, 16 Oct 2023 06:57:29 GMT

Thanks for check of stdout and stderr.

Here is log4j.pdf. Its just first 50 pages because this log was huge.

Re: Specify bottleneck for databricks cluster

Debayan — Tue, 17 Oct 2023 04:43:26 GMT

Hi,

Looks like there are a few connection errors and it is not able to connect to the default hive metastore.

org.datanucleus.excepƟons.NucleusExcepƟon: Error creaƟng transacƟonal connecƟon factory

Caused by: com.zaxxer.hikari.pool.HikariPool$PoolIniƟalizaƟonExcepƟon: Failed to iniƟalize pool: Couldnot connect to address=(host=consolidated-switzerlandnorth-prod-metastore-0.mysql.database.azure.com)(port=3306)(type=master) : Socket fail to connect to host:consolidated-switzerlandnorth-prod-metastore-0.mysql.database.azure.com, port:3306. consolidated-switzerlandnorth-prod-metastore-0.mysql.database.azure.com

I think there is a network config (firewall rules or routing rules) which is blocking it. Please check. Thanks!

Re: Specify bottleneck for databricks cluster

alesventus — Tue, 17 Oct 2023 07:55:15 GMT

Thanks @Debayan for your help.

Question is why is cluster trying to connect to default hive metastore when we use unity catalog only and we never set up hive metastore? Do we need to set up also Hive metastore?

See attached docs.

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Specify bottleneck for databricks cluster

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Re: Specify bottleneck for databricks cluster