其思想是支持任何文件系统方案并对其进行单独配置。例如:
# custom encryption key provider
fs.s3x.cse.enabled = true
fs.s3x.cse.materialsDescription.enabled = true
fs.s3x.cse.encryptionMaterialsProvider = my.company.fs.encryption.CustomKeyProvider
#no encryption
fs.s3u.cse.enabled = false
#AWS KMS
fs.s3k.cse.enabled = true
fs.s3k.cse.encryptionMaterialsProvider = com.amazon.ws.emr.hadoop.fs.cse.KMSEncryptionMaterialsProvider
fs.s3k.cse.kms.keyId = some-kms-id
然后在spark中使用它,如下所示:
StreamingQuery writeStream = session
.readStream()
.schema(RecordSchema.fromClass(TestRecord.class))
.option(OPTION_KEY_DELIMITER, OPTION_VALUE_DELIMITER_TAB)
.option(OPTION_KEY_QUOTE, OPTION_VALUE_QUOTATION_OFF)
.csv(âs3x://aws-s3-bucket/inputâ)
.as(Encoders.bean(TestRecord.class))
.writeStream()
.outputMode(OutputMode.Append())
.format("parquet")
.option("path", âs3k://aws-s3-bucket/outputâ)
.option("checkpointLocation", âs3u://aws-s3-bucket/checkpointingâ)
.start();
Ta处理此问题我实现了一个自定义Hadoop文件系统(扩展
org.apache.hadoop.fs.FileSystem
)它将调用委托给真实的文件系统,但需要修改配置。
// Create delegate FS
this.config.set("fs.s3n.impl", âcom.amazon.ws.emr.hadoop.fs.EmrFileSystemâ);
this.config.set("fs.s3n.impl.disable.cache", Boolean.toString(true));
this.delegatingFs = FileSystem.get(s3nURI(originalUri, SCHEME_S3N), substituteS3Config(conf));
传递给委派文件系统的配置应采用所有原始设置,并替换任何出现的
fs.s3*.
具有
fs.s3n.
.
private Configuration substituteS3Config(final Configuration conf) {
if (conf == null) return null;
final String fsSchemaPrefix = "fs." + getScheme() + ".";
final String fsS3SchemaPrefix = "fs.s3.";
final String fsSchemaImpl = "fs." + getScheme() + ".impl";
Configuration substitutedConfig = new Configuration(conf);
for (Map.Entry<String, String> configEntry : conf) {
String propName = configEntry.getKey();
if (!fsSchemaImpl.equals(propName)
&& propName.startsWith(fsSchemaPrefix)) {
final String newPropName = propName.replace(fsSchemaPrefix, fsS3SchemaPrefix);
LOG.info("Substituting property '{}' with '{}'", propName, newPropName);
substitutedConfig.set(newPropName, configEntry.getValue());
}
}
return substitutedConfig;
}
除此之外,请确保委派fs接收带有支持方案的URI和路径,并返回带有自定义方案的路径
@Override
public FileStatus getFileStatus(final Path f) throws IOException {
FileStatus status = this.delegatingFs.getFileStatus(s3Path(f));
if (status != null) {
status.setPath(customS3Path(status.getPath()));
}
return status;
}
private Path s3Path(final Path p) {
if (p.toUri() != null && getScheme().equals(p.toUri().getScheme())) {
return new Path(s3nURI(p.toUri(), SCHEME_S3N));
}
return p;
}
private Path customS3Path(final Path p) {
if (p.toUri() != null && !getScheme().equals(p.toUri().getScheme())) {
return new Path(s3nURI(p.toUri(), getScheme()));
}
return p;
}
private URI s3nURI(final URI originalUri, final String newScheme) {
try {
return new URI(
newScheme,
originalUri.getUserInfo(),
originalUri.getHost(),
originalUri.getPort(),
originalUri.getPath(),
originalUri.getQuery(),
originalUri.getFragment());
} catch (URISyntaxException e) {
LOG.warn("Unable to convert URI {} to {} scheme", originalUri, newScheme);
}
return originalUri;
}
最后一步是用Hadoop注册自定义文件系统(
spark-defaults
分类)
spark.hadoop.fs.s3x.impl = my.company.fs.DynamicS3FileSystem
spark.hadoop.fs.s3u.impl = my.company.fs.DynamicS3FileSystem
spark.hadoop.fs.s3k.impl = my.company.fs.DynamicS3FileSystem