Chao Sun created HDFS-13189:

             Summary: Standby NameNode should roll active edit log when 
                 Key: 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 
{{}} to let ANN roll its own 
log more frequently in case SBN is stuck on the lock.

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