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From Jerry Lam <chiling...@gmail.com>
Subject Re: [Spark SQL]: Spark Job Hangs on the refresh method when saving over 1 million files
Date Mon, 26 Oct 2015 00:39:03 GMT
Hi guys,

After waiting for a day, it actually causes OOM on the spark driver. I
configure the driver to have 6GB. Note that I didn't call refresh myself.
The method was called when saving the dataframe in parquet format. Also I'm
using partitionBy() on the DataFrameWriter to generate over 1 million
files. Not sure why it OOM the driver after the job is marked _SUCCESS in
the output folder.

Best Regards,

Jerry


On Sat, Oct 24, 2015 at 9:35 PM, Jerry Lam <chilinglam@gmail.com> wrote:

> Hi Spark users and developers,
>
> Does anyone encounter any issue when a spark SQL job produces a lot of
> files (over 1 millions), the job hangs on the refresh method? I'm using
> spark 1.5.1. Below is the stack trace. I saw the parquet files are produced
> but the driver is doing something very intensively (it uses all the cpus).
> Does it mean Spark SQL cannot be used to produce over 1 million files in a
> single job?
>
> Thread 528: (state = BLOCKED)
>  - java.util.Arrays.copyOf(char[], int) @bci=1, line=2367 (Compiled frame)
>  - java.lang.AbstractStringBuilder.expandCapacity(int) @bci=43, line=130
> (Compiled frame)
>  - java.lang.AbstractStringBuilder.ensureCapacityInternal(int) @bci=12,
> line=114 (Compiled frame)
>  - java.lang.AbstractStringBuilder.append(java.lang.String) @bci=19,
> line=415 (Compiled frame)
>  - java.lang.StringBuilder.append(java.lang.String) @bci=2, line=132
> (Compiled frame)
>  - org.apache.hadoop.fs.Path.toString() @bci=128, line=384 (Compiled frame)
>  -
> org.apache.spark.sql.sources.HadoopFsRelation$FileStatusCache$$anonfun$listLeafFiles$1.apply(org.apache.hadoop.fs.FileStatus)
> @bci=4, line=447 (Compiled frame)
>  -
> org.apache.spark.sql.sources.HadoopFsRelation$FileStatusCache$$anonfun$listLeafFiles$1.apply(java.lang.Object)
> @bci=5, line=447 (Compiled frame)
>  - scala.collection.TraversableLike$$anonfun$map$1.apply(java.lang.Object)
> @bci=9, line=244 (Compiled frame)
>  - scala.collection.TraversableLike$$anonfun$map$1.apply(java.lang.Object)
> @bci=2, line=244 (Compiled frame)
>  -
> scala.collection.IndexedSeqOptimized$class.foreach(scala.collection.IndexedSeqOptimized,
> scala.Function1) @bci=22, line=33 (Compiled frame)
>  - scala.collection.mutable.ArrayOps$ofRef.foreach(scala.Function1)
> @bci=2, line=108 (Compiled frame)
>  -
> scala.collection.TraversableLike$class.map(scala.collection.TraversableLike,
> scala.Function1, scala.collection.generic.CanBuildFrom) @bci=17, line=244
> (Compiled frame)
>  - scala.collection.mutable.ArrayOps$ofRef.map(scala.Function1,
> scala.collection.generic.CanBuildFrom) @bci=3, line=108 (Interpreted frame)
>  -
> org.apache.spark.sql.sources.HadoopFsRelation$FileStatusCache.listLeafFiles(java.lang.String[])
> @bci=279, line=447 (Interpreted frame)
>  - org.apache.spark.sql.sources.HadoopFsRelation$FileStatusCache.refresh()
> @bci=8, line=453 (Interpreted frame)
>  - org.apache.spark.sql.sources.HadoopFsRelation.org$apache$spark$sql$sources$HadoopFsRelation$$fileStatusCache$lzycompute()
> @bci=26, line=465 (Interpreted frame)
>  - org.apache.spark.sql.sources.HadoopFsRelation.org$apache$spark$sql$sources$HadoopFsRelation$$fileStatusCache()
> @bci=12, line=463 (Interpreted frame)
>  - org.apache.spark.sql.sources.HadoopFsRelation.refresh() @bci=1,
> line=540 (Interpreted frame)
>  -
> org.apache.spark.sql.execution.datasources.parquet.ParquetRelation.refresh()
> @bci=1, line=204 (Interpreted frame)
>  -
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1.apply$mcV$sp()
> @bci=392, line=152 (Interpreted frame)
>  -
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1.apply()
> @bci=1, line=108 (Interpreted frame)
>  -
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1.apply()
> @bci=1, line=108 (Interpreted frame)
>  -
> org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(org.apache.spark.sql.SQLContext,
> org.apache.spark.sql.SQLContext$QueryExecution, scala.Function0) @bci=96,
> line=56 (Interpreted frame)
>  -
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation.run(org.apache.spark.sql.SQLContext)
> @bci=718, line=108 (Interpreted frame)
>  -
> org.apache.spark.sql.execution.ExecutedCommand.sideEffectResult$lzycompute()
> @bci=20, line=57 (Interpreted frame)
>  - org.apache.spark.sql.execution.ExecutedCommand.sideEffectResult()
> @bci=15, line=57 (Interpreted frame)
>  - org.apache.spark.sql.execution.ExecutedCommand.doExecute() @bci=12,
> line=69 (Interpreted frame)
>  - org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$5.apply()
> @bci=11, line=140 (Interpreted frame)
>  - org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$5.apply()
> @bci=1, line=138 (Interpreted frame)
>  -
> org.apache.spark.rdd.RDDOperationScope$.withScope(org.apache.spark.SparkContext,
> java.lang.String, boolean, boolean, scala.Function0) @bci=131, line=147
> (Interpreted frame)
>  - org.apache.spark.sql.execution.SparkPlan.execute() @bci=189, line=138
> (Interpreted frame)
>  - org.apache.spark.sql.SQLContext$QueryExecution.toRdd$lzycompute()
> @bci=21, line=933 (Interpreted frame)
>  - org.apache.spark.sql.SQLContext$QueryExecution.toRdd() @bci=13,
> line=933 (Interpreted frame)
>  -
> org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(org.apache.spark.sql.SQLContext,
> java.lang.String, java.lang.String[], org.apache.spark.sql.SaveMode,
> scala.collection.immutable.Map, org.apache.spark.sql.DataFrame) @bci=293,
> line=197 (Interpreted frame)
>  - org.apache.spark.sql.DataFrameWriter.save() @bci=64, line=146
> (Interpreted frame)
>  - org.apache.spark.sql.DataFrameWriter.save(java.lang.String) @bci=24,
> line=137 (Interpreted frame)
>  - org.apache.spark.sql.DataFrameWriter.parquet(java.lang.String) @bci=8,
> line=304 (Interpreted frame)
>
> Best Regards,
>
> Jerry
>
>
>

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