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?
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