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https://issues.apache.org/jira/browse/HDDS-2241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16944053#comment-16944053
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Aravindan Vijayan edited comment on HDDS-2241 at 10/3/19 10:00 PM:
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[~aengineer] This was not based on data we have seen in read performance tests.
This is just an observation based on looking through the code while working on
HDDS-2188 along with [~msingh].
Even if this does not show up as a bottleneck at this point of time, IMHO the
2nd option looks like an obvious performance improvement that we should do.
was (Author: avijayan):
[~aengineer] This was not based on data we have seen in read performance tests.
This is just an observation based on looking through the code while working on
HDDS-2188 along with [~msingh].
> Optimize the refresh pipeline logic used by KeyManagerImpl to obtain the
> pipelines 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
> information from SCM through an RPC for every block in the key. For large
> files > 1GB, we may end up making a lot of 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, a simpler change would be to have a map (method local) of
> ContainerID -> Pipeline that we get from SCM so that we don't need to make
> repeated calls to SCM for the same containerID for a key. _Here, Number of
> calls = Number of unique containerIDs_
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