DynamoDB health up actuator endpoint not working

Question

I have this following piece of code :

    @Autowired
  public DynamoDBHealthIndicator(AmazonDynamoDB amazonDynamoDBClient, @Value("${session.tableName}") String tableName) {
    this.amazonDynamoDBClient = amazonDynamoDBClient;
    this.tableName = tableName;
  }

    @Override
      public Health health() {

    boolean dbOK = true;
    Map<String, String> healthDetails = new HashMap<>();
    if (amazonDynamoDBClient.listTables()
        .getTableNames()
        .contains(tableName)) {
      healthDetails.put(tableName, "FOUND");
    } else {
      healthDetails.put(tableName, "NOT FOUND");
      dbOK = false;
    }
    return dbOK ? Health.up()
        .withDetails(healthDetails)
        .build() : Health.down()
        .withDetails(healthDetails)
        .build();
     }

When I am visiting the endpoint for health - I am seeing DynamoDB down.

I see the value of the table getting populated correctly and queried the database and that worked fine too. I tried some other ways but felt hacky. And the documentation says this is the one to get results correctly - what am I doing wrong here ?

Answer 1

I have found the issue and the resolution - As pointed out above - Realized a problem yesterday evening. I stood up a container and added just one table to it - this time I got the result as success ! So, I started digging the lisTables number of results it is giving me back - turns out only 100 tables. Now with dynamoDB I am connecting on my dev env servers has 1000s of tables. That means I have to iterate - which would be wasteful.

I used describeTable to resolve my issue - instead of iterating through the tables - I can try and just describe table and get the result status to see if my table is in ACTIVE status

something like :

dbOK = false;

try{
          describeTableResult = amazonDynamoDBClient.describeTable(String.valueOf(tableName));
          if(describeTableResult != null){
            resultStatus = describeTableResult.getTable().getTableStatus();
            if(resultStatus.equals(DYNAMODB_DESIRED_TABLESTATUS)){
              log.info("dynamoDB table {} is healthy and in desired table status: {}", tableName, resultStatus);
              dbOK = true;
            }else{
              log.info("dynamoDB table {} is not healthy and is in status: {}", tableName, resultStatus);
            }
          }
        }catch(ResourceNotFoundException e){
          log.info("Table {} not found in dynamoDB", tableName);
        }
return dbOK;