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}
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