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https://issues.apache.org/jira/browse/HBASE-4568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nicolas Spiegelberg resolved HBASE-4568.
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Resolution: Fixed
Fix Version/s: 0.94.0
0.92.0
Hadoop Flags: Reviewed
> Make zk dump jsp response more quickly
> --------------------------------------
>
> Key: HBASE-4568
> URL: https://issues.apache.org/jira/browse/HBASE-4568
> Project: HBase
> Issue Type: Improvement
> Reporter: Liyin Tang
> Assignee: Liyin Tang
> Fix For: 0.92.0, 0.94.0
>
> Attachments: HBASE-4568.patch
>
>
> 1) For each zk dump, currently hbase will create a zk client instance every
> time.
> This is quite slow when any machines in the quorum is dead. Because it will
> connect to each machine in the zk quorum again.
> <code>
> HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
> Configuration conf = master.getConfiguration();
> HBaseAdmin hbadmin = new HBaseAdmin(conf);
> HConnection connection = hbadmin.getConnection();
> ZooKeeperWatcher watcher = connection.getZooKeeperWatcher();
> </code>
> So we can simplify this:
> <code>
> HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
> ZooKeeperWatcher watcher = master.getZooKeeperWatcher();
> </code>
> 2) Also when hbase call getServerStats() for each machine in the zk quorum,
> it hard coded the default time out as 1 min.
> It would be nice to make this configurable and set it to a low time out.
> When hbase tries to connect to each machine in the zk quorum, it will create
> the socket, and then set the socket time out, and read it with this time out.
> It means hbase will create a socket and connect to the zk server with 0 time
> out at first, which will take a long time.
> Because a timeout of zero is interpreted as an infinite timeout. The
> connection will then block until established or an error occurs.
> 3) The recoverable zookeeper should be real exponentially backoff when there
> is connection loss exception, which will give hbase much longer time window
> to recover from zk machine failures.
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