Weiwei Yang created HDFS-12744:
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Summary: More logs when short-circuit read is failed and disabled
Key: HDFS-12744
URL: https://issues.apache.org/jira/browse/HDFS-12744
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Reporter: Weiwei Yang
Assignee: Weiwei Yang
Short-circuit read (SCR) failed with following error
{noformat}
2017-10-21 16:42:28,024 WARN [B.defaultRpcServer.handler=7,queue=7,port=16020]
impl.BlockReaderFactory: BlockReaderFactory(xxx): unknown response code ERROR
while attempting to set up short-circuit access. Block xxx is not valid
{noformat}
then short-circuit read is disabled for *10 minutes* without any warning
message given in the log. This causes us spent some more time to figure out why
we had a long time window that SCR was not working. Propose to add a warning
log (other places already did) to indicate SCR is disabled and some more
logging in DN to display what happened.
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