steveloughran commented on a change in pull request #568: HADOOP-15691 Add
PathCapabilities to FS and FC to complement StreamCapabilities
URL: https://github.com/apache/hadoop/pull/568#discussion_r317271234
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File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java
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@@ -931,6 +933,36 @@ public Path getLinkTarget(Path path) throws IOException {
return res.targetFileSystem.getLinkTarget(res.remainingPath);
}
+ /**
+ * Fail fast on known write capabilities (append, concat),
+ * forward the rest to the viewed FS.
+ * @param path path to query the capability of.
+ * @param capability string to query the stream support for.
+ * @return the capability
+ * @throws IOException if there is no resolved FS, or it raises an IOE.
+ */
+ @Override
+ public boolean hasPathCapability(Path path, String capability)
+ throws IOException {
+ final Path p = makeQualified(path);
+ switch (validatePathCapabilityArgs(p, capability)) {
+ case CommonPathCapabilities.FS_CONCAT:
+ // concat is not supported, as it may be invoked across filesystems.
+ return false;
+ default:
Review comment:
done. clarified in javadocs that this is only for concat
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