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From "chenxu (Jira)" <j...@apache.org>
Subject [jira] [Created] (HBASE-23355) Add a conf key to decide which operations can trigger prefetch
Date Mon, 02 Dec 2019 03:16:00 GMT
chenxu created HBASE-23355:
------------------------------

             Summary: Add a conf key to decide which operations can trigger prefetch
                 Key: HBASE-23355
                 URL: https://issues.apache.org/jira/browse/HBASE-23355
             Project: HBase
          Issue Type: Improvement
            Reporter: chenxu
            Assignee: chenxu


Copy the comment from anoop under https://issues.apache.org/jira/browse/HBASE-23066?focusedCommentId=16984140&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16984140
{quote}On a side note, (Not related to this issue) when we have cache on write ON as well
as prefetch also On, do we do the caching part for the flushed files twice? When it is written,
its already been added to cache. Later as part of HFile reader open, the prefetch threads
will again do a read and add to cache!
{quote}
It's better to have a conf key to decide which operations(flush, compaction, regionOpen, bulkload)
can trigger the prefetch. In this way, if cacheonwrite is enabled, we can exclude the flush
and compaction operations when doing prefetch.



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