smiklosovic commented on code in PR #4278:
URL: https://github.com/apache/cassandra/pull/4278#discussion_r2254594174
##########
src/java/org/apache/cassandra/io/sstable/format/TOCComponent.java:
##########
@@ -78,20 +80,36 @@ public static Set<Component> loadTOC(Descriptor descriptor,
boolean skipMissing)
}
/**
- * Appends new component names to the TOC component.
+ * Updates the TOC file by reading existing component entries, merging
them with the given components,
+ * sorting the combined list in lexicographic order for deterministic
output.
+ *
+ * @param descriptor the SSTable descriptor for which to update the TOC
+ * @param components new components to merge into the TOC (existing TOC
entries are preserved)
+ * @throws FSWriteError if an I/O error occurs when creating or
overwriting the TOC file
*/
- public static void appendTOC(Descriptor descriptor, Collection<Component>
components)
+ public static void updateTOC(Descriptor descriptor, Collection<Component>
components)
{
+ if (components.isEmpty())
+ return;
+
File tocFile = descriptor.fileFor(Components.TOC);
- try (FileOutputStreamPlus out = tocFile.newOutputStream(APPEND);
- PrintWriter w = new PrintWriter(out))
+
+ Set<String> componentNames = new
TreeSet<>(Collections2.transform(components, Component::name));
+
+ if (tocFile.exists())
{
- for (Component component : components)
- w.println(component.name);
- w.flush();
- out.sync();
+ List<String> lines = FileUtils.readLines(tocFile);
+ if (lines.isEmpty())
Review Comment:
I was thinking about this and I just can not see a valid case of that file
being empty. It might only happen when we create a file and we fail to write
anything into it. I just can't see how this might happen. What would be empty
TOC file good for anyway?
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
