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Date: Wed, 7 Sep 2011 06:33:10 +0000 (UTC)
From: "gaojinchao (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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 <1412044669.23721.1315377190808.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Commented] (HBASE-2158) Change how high/low global limit
 works; start taking on writes as soon as we dip below high limit rather
 than block until low limit as we currently do.
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    [ https://issues.apache.org/jira/browse/HBASE-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13098645#comment-13098645 ] 

gaojinchao commented on HBASE-2158:
-----------------------------------

when memory reach the low limit, we should start a emergency Flusher. So I think It is diffcult to reach the high limit and if we reach it ,we will flush one by one.

if (fqe == null || fqe instanceof WakeupFlushThread) {
          if (isAboveLowWaterMark()) {
            LOG.info("Flush thread woke up with memory above low water.");
            if (!flushOneForGlobalPressure()) {
              // Wasn't able to flush any region, but we're above low water mark
              // This is unlikely to happen, but might happen when closing the
              // entire server - another thread is flushing regions. We'll just
              // sleep a little bit to avoid spinning, and then pretend that
              // we flushed one, so anyone blocked will check again
              lock.lock();
              try {
                Thread.sleep(1000);
                flushOccurred.signalAll();
              } finally {
                lock.unlock();
              }
            }
            // Enqueue another one of these tokens so we'll wake up again
            wakeupFlushThread();
          }
          continue;
        }

> Change how high/low global limit works; start taking on writes as soon as we dip below high limit rather than block until low limit as we currently do.
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-2158
>                 URL: https://issues.apache.org/jira/browse/HBASE-2158
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: stack
>
> A Ryan Rawson suggestion.  See HBASE-2149 for more context.

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