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[英]java.lang.OutOfMemoryError: Unable to acquire 36 bytes of memory, got 0
[英]java.lang.OutOfMemoryError: Unable to acquire 100 bytes of memory, got 0
我使用以下命令在本地模式下使用Spark 2.0調用Pyspark:
pyspark --executor-memory 4g --driver-memory 4g
輸入數據幀正在從tsv文件中讀取,並具有580 K x 28列。 我正在對數據幀進行一些操作,然后我嘗試將其導出到tsv文件,我收到此錯誤。
df.coalesce(1).write.save("sample.tsv",format = "csv",header = 'true', delimiter = '\t')
任何指針如何擺脫這個錯誤。 我可以輕松顯示df或計算行數。
輸出數據幀為3100行,共23列
錯誤:
Job aborted due to stage failure: Task 0 in stage 70.0 failed 1 times, most recent failure: Lost task 0.0 in stage 70.0 (TID 1073, localhost): org.apache.spark.SparkException: Task failed while writing rows
at org.apache.spark.sql.execution.datasources.DefaultWriterContainer.writeRows(WriterContainer.scala:261)
at org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelationCommand$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(InsertIntoHadoopFsRelationCommand.scala:143)
at org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelationCommand$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(InsertIntoHadoopFsRelationCommand.scala:143)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:70)
at org.apache.spark.scheduler.Task.run(Task.scala:85)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.OutOfMemoryError: Unable to acquire 100 bytes of memory, got 0
at org.apache.spark.memory.MemoryConsumer.allocatePage(MemoryConsumer.java:129)
at org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.acquireNewPageIfNecessary(UnsafeExternalSorter.java:374)
at org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.insertRecord(UnsafeExternalSorter.java:396)
at org.apache.spark.sql.execution.UnsafeExternalRowSorter.insertRow(UnsafeExternalRowSorter.java:94)
at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.sort_addToSorter$(Unknown Source)
at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(Unknown Source)
at org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
at org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$8$$anon$1.hasNext(WholeStageCodegenExec.scala:370)
at org.apache.spark.sql.execution.WindowExec$$anonfun$15$$anon$1.fetchNextRow(WindowExec.scala:300)
at org.apache.spark.sql.execution.WindowExec$$anonfun$15$$anon$1.<init>(WindowExec.scala:309)
at org.apache.spark.sql.execution.WindowExec$$anonfun$15.apply(WindowExec.scala:289)
at org.apache.spark.sql.execution.WindowExec$$anonfun$15.apply(WindowExec.scala:288)
at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1$$anonfun$apply$23.apply(RDD.scala:766)
at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1$$anonfun$apply$23.apply(RDD.scala:766)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:319)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:283)
at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:319)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:283)
at org.apache.spark.rdd.ZippedPartitionsRDD2.compute(ZippedPartitionsRDD.scala:89)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:319)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:283)
at org.apache.spark.rdd.ZippedPartitionsRDD2.compute(ZippedPartitionsRDD.scala:89)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:319)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:283)
at org.apache.spark.rdd.ZippedPartitionsRDD2.compute(ZippedPartitionsRDD.scala:89)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:319)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:283)
at org.apache.spark.rdd.CoalescedRDD$$anonfun$compute$1.apply(CoalescedRDD.scala:96)
at org.apache.spark.rdd.CoalescedRDD$$anonfun$compute$1.apply(CoalescedRDD.scala:95)
at scala.collection.Iterator$$anon$12.nextCur(Iterator.scala:434)
at scala.collection.Iterator$$anon$12.hasNext(Iterator.scala:440)
at org.apache.spark.sql.execution.datasources.DefaultWriterContainer$$anonfun$writeRows$1.apply$mcV$sp(WriterContainer.scala:253)
at org.apache.spark.sql.execution.datasources.DefaultWriterContainer$$anonfun$writeRows$1.apply(WriterContainer.scala:252)
at org.apache.spark.sql.execution.datasources.DefaultWriterContainer$$anonfun$writeRows$1.apply(WriterContainer.scala:252)
at org.apache.spark.util.Utils$.tryWithSafeFinallyAndFailureCallbacks(Utils.scala:1325)
at org.apache.spark.sql.execution.datasources.DefaultWriterContainer.writeRows(WriterContainer.scala:258)
... 8 more
Driver stacktrace:
我相信這個問題的原因是coalesce() ,盡管事實上它避免了一個完整的shuffle(比如重新分區會這樣做 ),但它必須縮小所請求數量的分區中的數據。
在這里,您要求所有數據適合一個分區,因此一個任務(並且只有一個任務)必須處理所有數據 ,這可能導致其容器受到內存限制。
因此,要么提出比1更多的分區,要么在這種情況下避免使用coalesce()
。
否則,您可以嘗試以下鏈接中提供的解決方案,以增加內存配置:
我的問題確實是coalesce()
。 我所做的是導出文件不是使用coalesce()
而是使用df.write.parquet("testP")
而是鑲木地板。 然后回讀文件並使用coalesce(1)
導出該文件。
希望它也適合你。
在我的情況下,用repartition(1)
替換coalesce(1)
repartition(1)
工作。
如其他答案中所述,使用repartition(1)
而不是coalesce(1)
。 原因是重新分區(1)將確保上游處理並行(多個任務/分區),而不是僅在一個執行器上完成。
引用Dataset.coalesce() Spark文檔:
但是,如果您正在進行激烈的合並,例如numPartitions = 1,則可能導致您的計算發生在比您喜歡的節點更少的節點上(例如,numPartitions = 1時的一個節點)。 為避免這種情況,您可以調用重新分區(1)。 這將添加一個shuffle步驟,但意味着當前的上游分區將並行執行(無論當前分區是什么)。
在我的情況下,司機比工人小。 通過使驅動程序更大來解決問題。
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