Chao Sun created HDFS-13189:
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Summary: Standby NameNode should roll active edit log when
checkpointing
Key: HDFS-13189
URL: https://issues.apache.org/jira/browse/HDFS-13189
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Chao Sun
When the SBN is doing checkpointing, it will hold the {{cpLock}}. In the
current implementation of edit log tailer thread, it will first check and roll
active edit log, and then tail and apply edits. In the case of checkpointing,
it will be blocked on the {{cpLock}} and will not roll the edit log.
It seems there is no dependency between the edit log roll and tailing edits, so
a better may be to do these in separate threads. This will be helpful for
people who uses the observer feature without in-progress edit log tailing.
An alternative is to configure
{{dfs.namenode.edit.log.autoroll.multiplier.threshold}} and
{{dfs.namenode.edit.log.autoroll.check.interval.ms}} to let ANN roll its own
log more frequently in case SBN is stuck on the lock.
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