1
我正在运行Spark 2
,并且正在尝试混洗5 TB左右的json。我是一个Dataset
的洗牌过程中遇到了很长的垃圾收集暂停:Spark:随机操作导致长时间的GC暂停
val operations = spark.read.json(inPath).as[MyClass]
operations.repartition(partitions, operations("id")).write.parquet("s3a://foo")
是否有任何明显的配置调整来解决这个问题?我的配置如下:
spark.driver.maxResultSize 6G
spark.driver.memory 10G
spark.executor.extraJavaOptions -XX:+UseG1GC -XX:MaxPermSize=1G -XX:+HeapDumpOnOutOfMemoryError
spark.executor.memory 32G
spark.hadoop.fs.s3a.buffer.dir /raid0/spark
spark.hadoop.fs.s3n.buffer.dir /raid0/spark
spark.hadoop.fs.s3n.multipart.uploads.enabled true
spark.hadoop.parquet.block.size 2147483648
spark.hadoop.parquet.enable.summary-metadata false
spark.local.dir /raid0/spark
spark.memory.fraction 0.8
spark.mesos.coarse true
spark.mesos.constraints priority:1
spark.mesos.executor.memoryOverhead 16000
spark.network.timeout 600
spark.rpc.message.maxSize 1000
spark.speculation false
spark.sql.parquet.mergeSchema false
spark.sql.planner.externalSort true
spark.submit.deployMode client
spark.task.cpus 1
您确定您需要1G MaxPermSize?也许它值得使用Java8(所以在OpenJDK/OracleJDK的情况下,该选项被忽略)。 –