[jira] [Created] (HBASE-16855) Avoid NPE in MetricsConnection’s construction

["ChiaPing Tsai (JIRA)" <ji...@apache.org>]

ChiaPing Tsai created HBASE-16855:
-------------------------------------

             Summary: Avoid NPE in MetricsConnection’s construction
                 Key: HBASE-16855
                 URL: https://issues.apache.org/jira/browse/HBASE-16855
             Project: HBase
          Issue Type: Bug
            Reporter: ChiaPing Tsai
            Priority: Minor


a) The batch pool may not be assigned a value in the ConnectionImpl’s construction.
b) The meta pool always be null in the ConnectionImpl’s construction.
For reasons outlined above, the NPE may happen in MetricsConnection’s construction
{noformat}
    final ThreadPoolExecutor batchPool = (ThreadPoolExecutor) conn.getCurrentBatchPool();
    final ThreadPoolExecutor metaPool = (ThreadPoolExecutor) conn.getCurrentMetaLookupPool();

    this.registry.register(name(this.getClass(), "executorPoolActiveThreads", scope),
        new RatioGauge() {
          @Override
          protected Ratio getRatio() {
            return Ratio.of(batchPool.getActiveCount(), batchPool.getMaximumPoolSize());
          }
        });
    this.registry.register(name(this.getClass(), "metaPoolActiveThreads", scope),
        new RatioGauge() {
          @Override
          protected Ratio getRatio() {
            return Ratio.of(metaPool.getActiveCount(), metaPool.getMaximumPoolSize());
          }
        });
{noformat}



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