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https://issues.apache.org/jira/browse/HDDS-15330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Andika updated HDDS-15330:
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Summary: Implement SCM FCR rate limit (was: Implement SCM FCR rate-limit)
> Implement SCM FCR rate limit
> ----------------------------
>
> Key: HDDS-15330
> URL: https://issues.apache.org/jira/browse/HDDS-15330
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Ivan Andika
> Assignee: Ivan Andika
> Priority: Major
>
> We have previous instances where a new bootstrapped SCM becomes OOM (FYI the
> OOM has 96GB heap size). We suspect that it's due to the concurrent FCR
> reports processed in SCM.
> HDFS implements a full block reports rate limit in HDFS-7923 to reduce the
> concurrent block reports residing in SCM using BlockReportLeaseManager. Ozone
> should also implement similar mechanism to prevent FCR storms.
> A possible design is that we register DN first, but don't include the full
> FCR immediately. SCM grants only N datanodes permission to send FCRs at once,
> similar to HDFS implementation.
> Another possibility to reduce the single FCR size to to split the FCR to one
> FCR per volume (can be considered in the future).
> One tradeoff of the rate-limiting is that new SCM might delay the SafeMode
> exit. However, this is better than SCM OOM.
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