ConfX created HBASE-27987: ----------------------------- Summary: HCommon get local file system fails with a casting error Key: HBASE-27987 URL: https://issues.apache.org/jira/browse/HBASE-27987 Project: HBase Issue Type: Bug Reporter: ConfX Attachments: reproduce.sh
h2. What happened After setting {{{}fs.file.impl=org.apache.hadoop.fs.RawLocalFileSystem{}}}, trying to acquire local file system using the {{getLocal}} in {{org.apache.hadoop.fs}} fails with {{java.lang.ClassCastException}} h2. Where's the bug In the function {{getLocal}} of {{FileSystem}} in HCommon: {code:java} public static LocalFileSystem getLocal(Configuration conf) throws IOException { return (LocalFileSystem)get(LocalFileSystem.NAME, conf); } {code} the returned file system is directly casted to LocalFileSystem without checking. If the user set the implementation of the local filesystem to be Raw rather than Checksum, this type cast would fail. h2. How to reproduce # Set {{fs.file.impl=org.apache.hadoop.fs.RawLocalFileSystem}} # Run {{org.apache.hadoop.hbase.TestHBaseTestingUtility#testMiniDFSCluster}} and the following exception should be observed: {code:java} java.lang.ClassCastException: class org.apache.hadoop.fs.RawLocalFileSystem cannot be cast to class org.apache.hadoop.fs.LocalFileSystem (org.apache.hadoop.fs.RawLocalFileSystem and org.apache.hadoop.fs.LocalFileSystem are in unnamed module of loader 'app') at org.apache.hadoop.fs.FileSystem.getLocal(FileSystem.java:441) at org.apache.hadoop.hbase.HBaseTestingUtility.getNewDataTestDirOnTestFS(HBaseTestingUtility.java:550) at org.apache.hadoop.hbase.HBaseTestingUtility.setupDataTestDirOnTestFS(HBaseTestingUtility.java:536) at org.apache.hadoop.hbase.HBaseTestingUtility.getDataTestDirOnTestFS(HBaseTestingUtility.java:510) at org.apache.hadoop.hbase.HBaseTestingUtility.getDataTestDirOnTestFS(HBaseTestingUtility.java:524) at org.apache.hadoop.hbase.HBaseTestingUtility.createDirsAndSetProperties(HBaseTestingUtility.java:737) at org.apache.hadoop.hbase.HBaseTestingUtility.startMiniDFSCluster(HBaseTestingUtility.java:682) at org.apache.hadoop.hbase.HBaseTestingUtility.startMiniDFSCluster(HBaseTestingUtility.java:665) at org.apache.hadoop.hbase.HBaseTestingUtility.startMiniDFSCluster(HBaseTestingUtility.java:653) at org.apache.hadoop.hbase.TestHBaseTestingUtility.testMiniDFSCluster(TestHBaseTestingUtility.java:377) {code} -- This message was sent by Atlassian Jira (v8.20.10#820010)