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https://issues.apache.org/jira/browse/HDDS-17606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18138552#comment-18138552
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Gargi Jaiswal edited comment on HDDS-17606 at 11/5/26, 7:10 AM:
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[~ayarovoy] Yes, you are correct, this is not a bug and we won't see any
performance improvement. But right now I am just double checking whether there
will be any harm if read happens for EC with SCR.
was (Author: JIRAUSER308350):
[~ayarovoy] Yes, you are correct, this is not a bug. But right now I am just
double checking whether there will be any harm if read happens for EC with SCR.
> EC key is read by short-circuit on a co-located client
> ------------------------------------------------------
>
> Key: HDDS-17606
> URL: https://issues.apache.org/jira/browse/HDDS-17606
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Elavarasan Kathirvel
> Assignee: Gargi Jaiswal
> Priority: Major
> Labels: short-circuit-read
>
> Short-circuit read is enabled on the cluster. An EC key is written and then
> read from a client running on the same host as a datanode.
> An EC key must use the normal read path via gRPC. Short-circuit is for Ratis
> keys.
> *Steps to Reproduce:*
> * Enable Short-Circuit Read (SCR) on the client and all DataNodes.
> ** Run {{ozone debug checknative}} and verify that {{hadoop: true}} is
> displayed on the client and DataNodes.
> * Create an EC bucket, for example, {{{}RS-3-2{}}}.
> * Create a 200 MB key and identify the replica host.
> * Read the key from the replica host. and check the {{localBytesGetBlock}}
> metric increases.
>
> Expected:
> * The read succeeds and the data matches.
> * The client uses the normal read path via gRPC.
> * {{numLocalGetBlock}} and {{localBytesGetBlock}} stays 0 on every datanode,
> including the co-located one.
> Actual:
> * The read succeeds and the data matches.
> * {{numLocalGetBlock}} and {{localBytesGetBlock}} increases on the
> co-located datanode.
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