hanishakoneru commented on a change in pull request #651: HDDS-1339. Implement ratis snapshots on OM
URL: https://github.com/apache/hadoop/pull/651#discussion_r270237034
 
 

 ##########
 File path: hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/ratis/OzoneManagerStateMachine.java
 ##########
 @@ -115,7 +117,60 @@ public TransactionContext startTransaction(
       return ctxt;
     }
     return handleStartTransactionRequests(raftClientRequest, omRequest);
+  }
+
+  /*
+   * Apply a committed log entry to the state machine.
+   */
+  @Override
+  public CompletableFuture<Message> applyTransaction(TransactionContext trx) {
+    try {
+      OMRequest request = OMRatisHelper.convertByteStringToOMRequest(
+          trx.getStateMachineLogEntry().getLogData());
+      long trxLogIndex = trx.getLogEntry().getIndex();
+      CompletableFuture<Message> future = CompletableFuture
+          .supplyAsync(() -> runCommand(request, trxLogIndex));
+      return future;
+    } catch (IOException e) {
+      return completeExceptionally(e);
+    }
+  }
+
+  /**
+   * Query the state machine. The request must be read-only.
+   */
+  @Override
+  public CompletableFuture<Message> query(Message request) {
+    try {
+      OMRequest omRequest = OMRatisHelper.convertByteStringToOMRequest(
+          request.getContent());
+      return CompletableFuture.completedFuture(queryCommand(omRequest));
+    } catch (IOException e) {
+      return completeExceptionally(e);
+    }
+  }
+
+  /**
+   * Take OM Ratis snapshot. Write the snapshot index to file. Snapshot index
+   * is the log index corresponding to the last applied transaction on the OM
+   * State Machine.
+   *
+   * @return the last applied index on the state machine which has been
+   * stored in the snapshot file.
+   */
+  @Override
+  public long takeSnapshot() throws IOException {
+    LOG.info("Saving Ratis snapshot on the OM.");
+    return ozoneManager.saveRatisSnapshot();
 
 Review comment:
   done. flushing the DB before saving a snapshot.

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