[jira] [Created] (HDFS-15649) the standby namenode's ReplQueues need to keep pace with active namenode.

["zhengchenyu (Jira)" <ji...@apache.org>]

zhengchenyu created HDFS-15649:
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             Summary: the standby namenode's ReplQueues need to keep pace with active namenode.
                 Key: HDFS-15649
                 URL: https://issues.apache.org/jira/browse/HDFS-15649
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 3.2.1, 2.7.3
            Reporter: zhengchenyu
             Fix For: 3.3.1


I think the standby namenode's ReplQueues need to keep pace with active namenode. You will code in fuction addStoredBlock like below: 
{code}
    // do not try to handle extra/low redundancy blocks during first safe mode
    if (!isPopulatingReplQueues()) {
      return storedBlock;
    }
{code}
Here, for standby namenode, through I think there are no need to tell standby to replicate blocks, but need to update neededReconstruction. Because some metrics need it. For example, missing blocks.

Why I advise this? In our internal version, some bug trigger huge missing block number. In fact, these blocks are not missing, but addStoredBlock doesn't update blocks, so keep huge missing block number.




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