spark MetadataVersionUtil 源码
spark MetadataVersionUtil 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/MetadataVersionUtil.scala
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.sql.execution.streaming
object MetadataVersionUtil {
/**
* Parse the log version from the given `text` -- will throw exception when the parsed version
* exceeds `maxSupportedVersion`, or when `text` is malformed (such as "xyz", "v", "v-1",
* "v123xyz" etc.)
*/
def validateVersion(text: String, maxSupportedVersion: Int): Int = {
if (text.length > 0 && text(0) == 'v') {
val version =
try {
text.substring(1, text.length).toInt
} catch {
case _: NumberFormatException =>
throw new IllegalStateException(s"Log file was malformed: failed to read correct log " +
s"version from $text.")
}
if (version > 0) {
if (version > maxSupportedVersion) {
throw new IllegalStateException(s"UnsupportedLogVersion: maximum supported log version " +
s"is v${maxSupportedVersion}, but encountered v$version. The log file was produced " +
s"by a newer version of Spark and cannot be read by this version. Please upgrade.")
} else {
return version
}
}
}
// reaching here means we failed to read the correct log version
throw new IllegalStateException(s"Log file was malformed: failed to read correct log " +
s"version from $text.")
}
}
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