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Posted to hdfs-dev@hadoop.apache.org by "tianhang tang (Jira)" <ji...@apache.org> on 2021/02/05 08:59:00 UTC
[jira] [Created] (HDFS-15822) Client retry mechanism may invalid
when use hedgedRead
tianhang tang created HDFS-15822:
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Summary: Client retry mechanism may invalid when use hedgedRead
Key: HDFS-15822
URL: https://issues.apache.org/jira/browse/HDFS-15822
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Reporter: tianhang tang
Hedgedread uses ignoreNodes to ensure that multiple requests fall on different nodes. But the ignoreNodes never been cleared. So if the request of 1st round all failed, and the refetched location is not changed, HDFS client would not request the same nodes which are in the ignoreNodes. It just sleep time by time until reach the retry num, then throw a exception.
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