[GitHub] [hbase] Apache9 commented on a change in pull request #2237: HBASE-24833: Bootstrap should not delete the META table directory if …

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Apache9 commented on a change in pull request #2237:
URL: https://github.com/apache/hbase/pull/2237#discussion_r472640228



##########
File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/InitMetaProcedure.java
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@@ -167,4 +171,35 @@ protected void completionCleanup(MasterProcedureEnv env) {
   public void await() throws InterruptedException {
     latch.await();
   }
+
+  private static boolean deleteMetaTableDirectoryIfPartial(FileSystem rootDirectoryFs,
+    Path metaTableDir) throws IOException {
+    boolean isPartial = true;
+    try {
+      TableDescriptor metaDescriptor =
+        FSTableDescriptors.getTableDescriptorFromFs(rootDirectoryFs, metaTableDir);
+      // when entering the state of INIT_META_WRITE_FS_LAYOUT, if a meta table directory is found,
+      // the meta table should not have any useful data and considers as partial.
+      // if we find any valid HFiles, operator should fix the meta e.g. via HBCK.
+      if (metaDescriptor != null && metaDescriptor.getColumnFamilyCount() > 0) {
+        RemoteIterator<LocatedFileStatus> iterator = rootDirectoryFs.listFiles(metaTableDir, true);
+        while (iterator.hasNext()) {
+          LocatedFileStatus status = iterator.next();
+          if (StoreFileInfo.isHFile(status.getPath()) && HFile
+            .isHFileFormat(rootDirectoryFs, status.getPath())) {
+            isPartial = false;
+            break;
+          }
+        }
+      }
+    } finally {
+      if (!isPartial) {
+        throw new IOException("Meta table is not partial, please sideline this meta directory "
+          + "or run HBCK to fix this meta table, e.g. rebuild the server hostname in ZNode for the "
+          + "meta region");
+      }

Review comment:
       In general the approach is fine. The only concern is the implementation. I do not think InitMetaProcedure support rollback, so what will happen if we throw exception here? You will see a ERROR log in the output to say that the procedure does not support rollback?




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