jt2594838 commented on a change in pull request #1169:
URL: https://github.com/apache/incubator-iotdb/pull/1169#discussion_r427948083
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File path:
server/src/main/java/org/apache/iotdb/db/engine/modification/ModificationFile.java
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@@ -125,4 +133,34 @@ public void remove() throws IOException {
FSFactoryProducer.getFSFactory().getFile(filePath).delete();
}
+ public boolean exists() {
+ return new File(filePath).exists();
+ }
+
+ /**
+ * Create a hardlink for the modification file.
+ * The hardlink with have a suffix like ".{sysTime}_{randomLong}"
+ * @return a new ModificationFile with its path changed to the hardlink, or
null if the origin
+ * file does not exist or the hardlink cannot be created.
+ */
+ public ModificationFile createHardlink() {
+ if (!exists()) {
+ return null;
+ }
+
+ while (true) {
+ String hardlinkSuffix = "." + System.currentTimeMillis() + "_" +
random.nextLong();
+ File hardlink = new File(filePath + hardlinkSuffix);
+
+ try {
+ Files.createLink(Paths.get(hardlink.getAbsolutePath()),
Paths.get(filePath));
+ return new ModificationFile(hardlink.getAbsolutePath());
+ } catch (FileAlreadyExistsException e) {
+ // retry a different name if the file is already created
Review comment:
The name is generated randomly, so continuing is a retry.
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