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https://issues.apache.org/jira/browse/HBASE-26660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17475254#comment-17475254
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Pola Sairam commented on HBASE-26660:
-------------------------------------
I am working on it
> Override the flush requested by PeriodicMemstoreFlusher by the Flush
> requested when hbase.hregion.memstore.flush.size is breached
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-26660
> URL: https://issues.apache.org/jira/browse/HBASE-26660
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Reporter: Pola Sairam
> Assignee: Pola Sairam
> Priority: Major
>
> PeriodicMemstoreFlusher requests flush with a random delay ranging from 0 to
> `hbase.regionserver.periodicmemstoreflusher.rangeofdelayseconds`
> For example, consider the following configuration:
> ^hbase.regionserver.periodicmemstoreflusher.rangeofdelayseconds - 200 secs^
> ^hbase.hregion.memstore.flush.size - 256MB^
> ^hbase.hregion.memstore.block.multiplier - 4^
> Consider the case when PeriodicMemstoreFlusher requests a flush with 100secs
> delay and memstore size is less than 256MB.
> Now if we have write load that fills the memstore more than 256MB, the flush
> request because of memstore breaching `hbase.hregion.memstore.flush.size` is
> not honored as a flush request already exists that was made by
> PeriodicMemstoreFlusher.
> And if we have a huge write load, then blocking limit will also hit and
> writes will start failing not only till flush is happened but also during the
> delay time (< 100secs in this case) added by PeriodicMemstoreFlusher.
> We need to overwrite the flush requested by PeriodicMemstoreFlusher by the
> flush requested when memstore flush size is reached to remove the delay in
> flushing.
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