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我目前正在尝试将delta-lake parquet文件写入 S3，我在本地将其替换为 MinIO。

我可以完美地将标准parquet文件读/写到S3.

但是，当我使用三角洲湖示例时

将增量配置为 s3

看来我无法写信delta_log/给我的MinIO.

所以我尝试设置：fs.AbstractFileSystem.s3a.impl和fs.s3a.impl。

我正在使用pyspark[sql]==2.4.3我当前使用的venv.

src/.env：

# pyspark packages
DELTA = io.delta:delta-core_2.11:0.3.0
HADOOP_COMMON = org.apache.hadoop:hadoop-common:2.7.3
HADOOP_AWS = org.apache.hadoop:hadoop-aws:2.7.3
PYSPARK_SUBMIT_ARGS = ${HADOOP_AWS},${HADOOP_COMMON},${DELTA}

src/spark_session.py：

# configure s3 connection for read/write operation (native spark)
hadoop_conf = sc.sparkContext._jsc.hadoopConfiguration()
hadoop_conf.set("fs.s3a.endpoint", self.aws_endpoint_url)
hadoop_conf.set("fs.s3a.access.key", self.aws_access_key_id)
hadoop_conf.set("fs.s3a.secret.key", self.aws_secret_access_key)
# hadoop_conf.set("fs.AbstractFileSystem.s3a.impl", "org.apache.hadoop.fs.s3a.S3AFileSystem")  #  when using hadoop 2.8.5
# hadoop_conf.set("fs.s3a.impl", "org.apache.hadoop.fs.s3a.S3AFileSystem")  #  alternative to above hadoop 2.8.5
hadoop_conf.set("fs.s3a.path.style.access", "true")
hadoop_conf.set("spark.history.fs.logDirectory", 's3a://spark-logs-test/')

src/apps/raw_to_parquet.py

# Trying to write pyspark dataframe to MinIO (S3)

raw_df.coalesce(1).write.format("delta").save(s3_url)

bash：

# RUN CODE
spark-submit --packages $(PYSPARK_SUBMIT_ARGS) src/run_onlineretailer.py

错误hadoop-common: 2.7.3，hadoop-aws: 2.7.3：java.lang.RuntimeException: java.lang.NoSuchMethodException: org.apache.hadoop.fs.s3a.S3AFileSystem.<init>(java.net.URI, org.apache.hadoop.conf.Configuration)

所以有了这个错误，我然后更新到hadoop-common: 2.8.5, hadoop-aws: 2.8.5, 来修复NoSuchMethodException. 因为delta需要：S3AFileSystem

py4j.protocol.Py4JJavaError: An error occurred while calling o89.save. : java.lang.NoSuchMethodError: org.apache.hadoop.security.ProviderUtils.excludeIncompatibleCredentialProviders(Lorg/apache/hadoop/conf/Configuration;Ljava/lang/Class;)Lorg/apache/hadoop/conf/Configuration

所以对我来说，似乎parquet可以毫无问题地写入文件，但是，delta 创建了这些delta_log无法识别的文件夹（我认为？）。

当前源代码。

阅读几个不同的类似问题，但似乎没有人尝试处理delta lake文件。

更新

它目前使用以下设置：

#pyspark packages
DELTA_LOGSTORE = spark.delta.logStore.class=org.apache.spark.sql.delta.storage.S3SingleDriverLogStore
DELTA = io.delta:delta-core_2.11:0.3.0
HADOOP_COMMON = org.apache.hadoop:hadoop-common:2.7.7
HADOOP_AWS = org.apache.hadoop:hadoop-aws:2.7.7
PYSPARK_SUBMIT_ARGS = ${HADOOP_AWS},${HADOOP_COMMON},${DELTA}
PYSPARK_CONF_ARGS = ${DELTA_LOGSTORE}

# configure s3 connection for read/write operation (native spark)
hadoop_conf = sc.sparkContext._jsc.hadoopConfiguration()
hadoop_conf.set("fs.s3a.endpoint", self.aws_endpoint_url)
hadoop_conf.set("fs.s3a.access.key", self.aws_access_key_id)
hadoop_conf.set("fs.s3a.secret.key", self.aws_secret_access_key)

spark-submit --packages $(PYSPARK_SUBMIT_ARGS) --conf $(PYSPARK_CONF_ARGS) src/run_onlineretailer.py

奇怪的是，它只会像这样工作。

如果我尝试设置它sc.conf或hadoop_conf它不起作用，请参阅未注释的代码：

def spark_init(self) -> SparkSession:

    sc: SparkSession = SparkSession \
        .builder \
        .appName(self.app_name) \
        .config("spark.sql.warehouse.dir", self.warehouse_location) \
        .getOrCreate()

    # set log level
    sc.sparkContext.setLogLevel("WARN")

    # Enable Arrow-based columnar data transfers
    sc.conf.set("spark.sql.execution.arrow.enabled", "true")

    # sc.conf.set("spark.delta.logStore.class", "org.apache.spark.sql.delta.storage.S3SingleDriverLogStore") # does not work

    # configure s3 connection for read/write operation (native spark)
    hadoop_conf = sc.sparkContext._jsc.hadoopConfiguration()
    hadoop_conf.set("fs.s3a.endpoint", self.aws_endpoint_url)
    hadoop_conf.set("fs.s3a.access.key", self.aws_access_key_id)
    hadoop_conf.set("fs.s3a.secret.key", self.aws_secret_access_key)
    #hadoop_conf.set("spark.delta.logStore.class", "org.apache.spark.sql.delta.storage.S3SingleDriverLogStore") # does not work

    return sc

如果有人可以解释这一点，那就太好了。是因为.getOrCreate()？conf没有这个电话似乎不可能设置？运行应用程序时在命令行中除外。

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1 回答 1

-1

你正在混合 hadoop-* jars；就像火花一样，它们只有在它们都来自同一个版本时才有效

于 2019-09-09T10:39:46.193 回答