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https://issues.apache.org/jira/browse/SPARK-37588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramakrishna chilaka updated SPARK-37588:
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Attachment: screenshot-1.png
> lot of strings get accumulated in the heap dump of spark thrift server
> ----------------------------------------------------------------------
>
> Key: SPARK-37588
> URL: https://issues.apache.org/jira/browse/SPARK-37588
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, SQL
> Affects Versions: 3.2.0
> Environment: Open JDK (8 build 1.8.0_312-b07) and scala 2.12
> OS: Red Hat Enterprise Linux 8.4 (Ootpa), platform:el8
> Reporter: ramakrishna chilaka
> Priority: Major
> Attachments: screenshot-1.png
>
>
> I am starting spark thrift server using the following options
> ```
> /data/spark/sbin/start-thriftserver.sh --master spark://*****:7077 --conf
> "spark.cores.max=320" --conf "spark.executor.cores=3" --conf
> "spark.driver.cores=15" --executor-memory=10G --driver-memory=50G --conf
> spark.sql.adaptive.coalescePartitions.enabled=true --conf
> spark.sql.adaptive.skewJoin.enabled=true --conf spark.sql.cbo.enabled=true
> --conf spark.sql.adaptive.enabled=true --conf spark.rpc.io.serverThreads=64
> --conf "spark.driver.maxResultSize=4G" --conf
> "spark.max.fetch.failures.per.stage=10" --conf
> "spark.sql.thriftServer.incrementalCollect=false" --conf
> "spark.ui.reverseProxy=true" --conf "spark.ui.reverseProxyUrl=/spark_ui"
> --conf "spark.sql.autoBroadcastJoinThreshold=1073741824" --conf
> spark.sql.thriftServer.interruptOnCancel=true --conf
> spark.sql.thriftServer.queryTimeout=0 --hiveconf
> hive.server2.transport.mode=http --hiveconf
> hive.server2.thrift.http.path=spark_sql --hiveconf
> hive.server2.thrift.min.worker.threads=500 --hiveconf
> hive.server2.thrift.max.worker.threads=2147483647 --hiveconf
> hive.server2.thrift.http.cookie.is.secure=false --hiveconf
> hive.server2.thrift.http.cookie.auth.enabled=false --hiveconf
> hive.server2.authentication=NONE --hiveconf hive.server2.enable.doAs=false
> --hiveconf spark.sql.hive.thriftServer.singleSession=true --hiveconf
> hive.server2.thrift.bind.host=0.0.0.0 --conf
> "spark.sql.extensions=io.delta.sql.DeltaSparkSessionExtension" --conf
> "spark.sql.catalog.spark_catalog=org.apache.spark.sql.delta.catalog.DeltaCatalog"
> --conf "spark.sql.cbo.joinReorder.enabled=true" --conf
> "spark.sql.optimizer.dynamicPartitionPruning.enabled=true" --conf
> "spark.worker.cleanup.enabled=true" --conf
> "spark.worker.cleanup.appDataTtl=3600" --hiveconf
> hive.exec.scratchdir=/data/spark_scratch/hive --hiveconf
> hive.exec.local.scratchdir=/data/spark_scratch/local_scratch_dir --hiveconf
> hive.download.resources.dir=/data/spark_scratch/hive.downloaded.resources.dir
> --hiveconf hive.querylog.location=/data/spark_scratch/hive.querylog.location
> --conf spark.executor.extraJavaOptions="-XX:+PrintGCDetails
> -XX:+PrintGCTimeStamps" --conf spark.driver.extraJavaOptions="-verbose:gc
> -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps
> -Xloggc:/data/thrift_driver_gc.log -XX:+ExplicitGCInvokesConcurrent
> -XX:MinHeapFreeRatio=20 -XX:MaxHeapFreeRatio=40 -XX:GCTimeRatio=4
> -XX:AdaptiveSizePolicyWeight=90 -XX:MaxRAM=55g" --hiveconf
> "hive.server2.session.check.interval=60000" --hiveconf
> "hive.server2.idle.session.timeout=900000" --hiveconf
> "hive.server2.idle.session.check.operation=true" --conf
> "spark.eventLog.enabled=false" --conf
> "spark.cleaner.periodicGC.interval=5min" --conf
> "spark.appStateStore.asyncTracking.enable=false" --conf
> "spark.ui.retainedJobs=30" --conf "spark.ui.retainedStages=100" --conf
> "spark.ui.retainedTasks=500" --conf "spark.sql.ui.retainedExecutions=10"
> --conf "spark.ui.retainedDeadExecutors=10" --conf
> "spark.worker.ui.retainedExecutors=10" --conf
> "spark.worker.ui.retainedDrivers=10" --conf spark.ui.enabled=false --conf
> spark.stage.maxConsecutiveAttempts=10 --conf spark.executor.memoryOverhead=1G
> --conf "spark.io.compression.codec=snappy" --conf
> "spark.default.parallelism=640" --conf spark.memory.offHeap.enabled=true
> --conf "spark.memory.offHeap.size=3g" --conf "spark.memory.fraction=0.75"
> --conf "spark.memory.storageFraction=0.75"
> ```
> the java heap dump after heavy usage is as follows
> ```
> 1: 50465861 9745837152 [C
> 2: 23337896 1924089944 [Ljava.lang.Object;
> 3: 72524905 1740597720 java.lang.Long
> 4: 50463694 1614838208 java.lang.String
> 5: 22718029 726976928
> org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema
> 6: 2259416 343483328 [Lscala.collection.mutable.HashEntry;
> 7: 16 141744616 [Lorg.apache.spark.sql.Row;
> 8: 532529 123546728
> org.apache.spark.sql.catalyst.expressions.Cast
> 9: 535418 72816848
> org.apache.spark.sql.catalyst.expressions.Literal
> 10: 1105284 70738176 scala.collection.mutable.LinkedHashSet
> 11: 1725833 70655016 [J
> 12: 1154128 55398144 scala.collection.mutable.HashMap
> 13: 1720740 55063680 org.apache.spark.util.collection.BitSet
> 14: 572222 50355536 scala.collection.immutable.Vector
> 15: 1602297 38455128 scala.Some
> 16: 1154303 36937696 scala.collection.immutable.$colon$colon
> 17: 1105284 26526816
> org.apache.spark.sql.catalyst.expressions.AttributeSet
> 18: 1066442 25594608 java.lang.Integer
> 19: 735502 23536064
> scala.collection.immutable.HashSet$HashSet1
> 20: 10300 19511408 [B
> 21: 543994 17407808 scala.Tuple2
> 22: 530244 16967808 org.apache.spark.sql.catalyst.trees.Origin
> 23: 274445 13173360 java.util.Hashtable$Entry
> 24: 225826 13089920 [Lscala.collection.immutable.HashSet;
> 25: 529922 12718128
> org.apache.spark.sql.catalyst.expressions.CastBase$$Lambda$3882/1746188635
> 26: 221866 10649568
> java.util.concurrent.ConcurrentHashMap$Node
> 27: 384729 9233496 java.lang.Double
> 28: 225826 7226432
> scala.collection.immutable.HashSet$HashTrieSet
> 29: 1071 6659680
> [Ljava.util.concurrent.ConcurrentHashMap$Node;
> 30: 25853 4348744 java.lang.Class
> 31: 5760 3916800
> io.netty.util.internal.shaded.org.jctools.queues.MpscArrayQueue
> 32: 1232 3710888 [Ljava.util.Hashtable$Entry;
> 33: 17303 3460600
> org.apache.spark.sql.catalyst.expressions.objects.Invoke
> 34: 20409 3265440 java.lang.reflect.Method
> 35: 47506 2280288 java.util.HashMap$Node
> 36: 7489 1568600 [Ljava.util.HashMap$Node;
> 37: 285 1539888 [Ljava.nio.ByteBuffer;
> 38: 237 1452984 [[B
> 39: 4138 1291056 org.apache.spark.status.TaskDataWrapper
> ```
> there is 9.7 gb of heap memory that is occupied by char array, not sure, why
> is it ? Can someone help me understand remove this 9.7 gb of memory.
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