[jira] [Created] (HDFS-14346) EditLogTailer loses precision for sub-second edit log tailing and rolling interval

["Chao Sun (JIRA)" <ji...@apache.org>]

Chao Sun created HDFS-14346:
-------------------------------

             Summary: EditLogTailer loses precision for sub-second edit log tailing and rolling interval
                 Key: HDFS-14346
                 URL: https://issues.apache.org/jira/browse/HDFS-14346
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
            Reporter: Chao Sun
            Assignee: Chao Sun


{{EditLogTailer}} currently uses the following:
{code}
    logRollPeriodMs = conf.getTimeDuration(
        DFSConfigKeys.DFS_HA_LOGROLL_PERIOD_KEY,
        DFSConfigKeys.DFS_HA_LOGROLL_PERIOD_DEFAULT, TimeUnit.SECONDS) * 1000;

    sleepTimeMs = conf.getTimeDuration(
        DFSConfigKeys.DFS_HA_TAILEDITS_PERIOD_KEY,
        DFSConfigKeys.DFS_HA_TAILEDITS_PERIOD_DEFAULT, TimeUnit.SECONDS) * 1000;
{code}
to determine the edit log roll and tail frequency. However, if user specify sub-second frequency, such as {{100ms}}, it will lose precision and become 0s. This is not ideal for some scenarios such as standby reads (HDFS-12943).



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