[jira] [Updated] (HBASE-26660) Override the flush requested by PeriodicMemstoreFlusher by the Flush requested when hbase.hregion.memstore.flush.size is breached

["Pola Sairam (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-26660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pola Sairam updated HBASE-26660:
--------------------------------
    Fix Version/s: 1.7.1

> 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
>             Fix For: 1.7.1
>
>
> 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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