Chao Sun created HDFS-14346:
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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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