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https://issues.apache.org/jira/browse/HDDS-2241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aravindan Vijayan updated HDDS-2241:
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Description:
Currently, while looking up a key, the Ozone Manager gets the pipeline location
information from SCM through an RPC for every block in the key. For large files
> 1GB, we may end up making ~4 RPC calls for this. This can be optimized in a
couple of ways
* We can implement a batch getContainerWithPipeline API in SCM using which we
can get the pipeline info locations for all the blocks for a file. To keep the
number of containers passed in to SCM in a single call, we can have a fixed
container batch size on the OM side. _Here, Number of calls = 1 (or k depending
on batch size)_
* Instead, we can have a simple map (method local) for ContainerID -> Pipeline
that we get from SCM so that we don't need to make calls to SCM again for the
same pipeline for that key. _Here, Number of calls = Number of unique
containerIDs_
was:
Currently, while looking up a key, the Ozone Manager gets the pipeline location
information from SCM through an RPC for every block in the key. For large files
> 1GB, we may end up making ~4 RPC calls for this. This can be optimized in a
couple of ways
* We can implement a batch getContainerWithPipeline API in SCM using which we
can get the pipeline info locations for all the blocks for a file. To keep the
number of containers passed in to SCM in a single call, we can have a fixed
container batch size on the OM side.
* Instead, we can have a simple map (inside the method) for ContainerID ->
Pipeline that we got from SCM so that we don't need to make calls to SCM again
for the same pipeline. Here number of calls = number of unique containerIDs.
> Optimize the refresh pipeline logic used by KeyManagerImpl to obtain the
> pipeline for a key
> -------------------------------------------------------------------------------------------
>
> Key: HDDS-2241
> URL: https://issues.apache.org/jira/browse/HDDS-2241
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Manager
> Reporter: Aravindan Vijayan
> Assignee: Aravindan Vijayan
> Priority: Major
>
> Currently, while looking up a key, the Ozone Manager gets the pipeline
> location information from SCM through an RPC for every block in the key. For
> large files > 1GB, we may end up making ~4 RPC calls for this. This can be
> optimized in a couple of ways
> * We can implement a batch getContainerWithPipeline API in SCM using which we
> can get the pipeline info locations for all the blocks for a file. To keep
> the number of containers passed in to SCM in a single call, we can have a
> fixed container batch size on the OM side. _Here, Number of calls = 1 (or k
> depending on batch size)_
> * Instead, we can have a simple map (method local) for ContainerID ->
> Pipeline that we get from SCM so that we don't need to make calls to SCM
> again for the same pipeline for that key. _Here, Number of calls = Number of
> unique containerIDs_
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