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## What changes were proposed in this pull request? SPARK-19464 removed support for Hadoop 2.5 and earlier, so we can do some cleanup for HDFSMetadataLog. This PR includes the following changes: - ~~Remove the workaround codes for HADOOP-10622.~~ Unfortunately, there is another issue [HADOOP-14084](https://issues.apache.org/jira/browse/HADOOP-14084) that prevents us from removing the workaround codes. - Remove unnecessary `writer: (T, OutputStream) => Unit` and just call `serialize` directly. - Remove catching FileNotFoundException. ## How was this patch tested? Jenkins Author: Shixiong Zhu <shixiong@databricks.com> Closes #16932 from zsxwing/metadata-cleanup. |
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