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https://issues.apache.org/jira/browse/HDDS-17606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elavarasan Kathirvel updated HDDS-17606:
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Description:
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.
was:
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.
> 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
> 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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