[jira] [Updated] (KAFKA-13624) Add Metric for Store Cache Size

["Sagar Rao (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-13624?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sagar Rao updated KAFKA-13624:
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    Description: KIP-770 introduced a new metric called `{*}input-buffer-bytes-total`{*} to track the total amount of bytes accumulated by a task. While working through it's PR, it was suggested to add a similar metric for *cache-size-bytes-total* to track the cache size in bytes for a task.   (was: The current config "buffered.records.per.partition" controls how many records in maximum to bookkeep, and hence it is exceed we would pause fetching from this partition. However this config has two issues:

* It's a per-partition config, so the total memory consumed is dependent on the dynamic number of partitions assigned.
* Record size could vary from case to case.

And hence it's hard to bound the memory usage for this buffering. We should consider deprecating that config with a global, e.g. "input.buffer.max.bytes" which controls how much bytes in total is allowed to be buffered. This is doable since we buffer the raw records in <byte[], byte[]>.)

> Add Metric for Store Cache Size
> -------------------------------
>
>                 Key: KAFKA-13624
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13624
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Sagar Rao
>            Assignee: Sagar Rao
>            Priority: Major
>              Labels: needs-kip
>
> KIP-770 introduced a new metric called `{*}input-buffer-bytes-total`{*} to track the total amount of bytes accumulated by a task. While working through it's PR, it was suggested to add a similar metric for *cache-size-bytes-total* to track the cache size in bytes for a task. 



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