farmmamba created HDFS-17335:
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Summary: Add metrics for syncWaitQ in FSEditLogAsync
Key: HDFS-17335
URL: https://issues.apache.org/jira/browse/HDFS-17335
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 3.3.6
Reporter: farmmamba
To monitor syncWaitQ in FSEditLogAsync, we add a metric syncPendingCount.
The reason we add this metrics is that when dequeueEdit() return null, the
boolean variable doSync is set to {color:#0747a6}+!syncWaitQ.isEmpty()+
{color:#172b4d}After adding this metrics we can better monitor sync performance
and codes.{color}{color}
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