abstractdog commented on code in PR #4753:
URL: https://github.com/apache/hive/pull/4753#discussion_r1342887632
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common/src/java/org/apache/hadoop/hive/common/FileUtils.java:
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@@ -1387,6 +1388,48 @@ public static RemoteIterator<LocatedFileStatus>
listFiles(FileSystem fs, Path pa
status -> filter.accept(status.getPath()));
}
+ /**
+ * Resolves a symlink on a local filesystem. In case of any exceptions or
scheme other than "file"
+ * it simply returns the original path. Refer to DEBUG level logs for
further details.
+ * @param path input path to be resolved
+ * @param conf a Configuration instance to be used while resolving the
FileSystem
+ * @return the resolved target Path or the original if the input Path is not
a symlink
+ * @throws IOException
+ */
+ public static Path resolveSymlinks(Path path, Configuration conf) throws
IOException {
+ if (path == null) {
+ throw new IllegalArgumentException("Cannot resolve symlink for a null
Path");
+ }
+
+ String scheme = path.toUri().getScheme();
+
+ /*
+ * If you're about to extend this method to e.g. HDFS, simply remove this
check.
+ * There is a known exception reproduced by whroot_external1.q, which can
be referred to,
+ * which is because java.nio is not prepared by default for other schemes
like "hdfs".
+ */
+ if (!"file".equalsIgnoreCase(scheme)) {
+ LOG.debug("scheme '{}' is not supported for resolving symlinks", scheme);
+ return path;
+ }
+
+ FileSystem srcFs;
+ if (scheme != null) {
+ srcFs = path.getFileSystem(conf);
+ } else {
+ srcFs = FileSystem.getLocal(conf);
+ }
Review Comment:
right, this check became completely unnecessary, I'm removing it!
moreover, even the filesystem resolution became unnecessary, removing it also
however, I'm keeping the config param for later use
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