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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17974) Concurrency concerns in transition of space quota state with large clusters
Date Fri, 28 Apr 2017 12:30:04 GMT
Josh Elser created HBASE-17974:
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             Summary: Concurrency concerns in transition of space quota state with large clusters
                 Key: HBASE-17974
                 URL: https://issues.apache.org/jira/browse/HBASE-17974
             Project: HBase
          Issue Type: Improvement
            Reporter: Josh Elser
            Priority: Minor


spin-out from https://issues.apache.org/jira/browse/HBASE-16961?focusedCommentId=15985358&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15985358

As the master processes the current space usages for all tables with space quotas, it does
so serially. It also synchronizes on the map which stores each table's state. This prevents
the master from easily changing to process table quota violation state transition.

When we get to clusters with large number of tables, each with a space quota, we could run
into a situation where a non-zero source of latency is iterating over each table in serial.



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