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https://issues.apache.org/jira/browse/HBASE-12557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14221810#comment-14221810
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Ted Yu commented on HBASE-12557:
--------------------------------
ThreadPoolExecutor can provide count of threads that are executing tasks.
In the following code:
{code}
InetSocketAddress isa = new InetSocketAddress("zxy.org", 321);
try {
InetAddress addr = isa.getAddress();
String ipAddressString = DNS.reverseDns(addr, null);
{code}
if I replace "zxy.org" with "zxyy.org" , isa.getAddress() returns null.
Still looking for a way to make lengthy DNS related call.
> Introduce timeout mechanism for IP to rack resolution
> -----------------------------------------------------
>
> Key: HBASE-12557
> URL: https://issues.apache.org/jira/browse/HBASE-12557
> Project: HBase
> Issue Type: Improvement
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 12557-v1.txt
>
>
> Config parameter, "hbase.util.ip.to.rack.determiner", determines the class
> which does IP to rack resolution.
> The actual resolution may be lengthy.
> This JIRA is continuation of HBASE-12554 where a mock DNSToSwitchMapping is
> used for rack resolution.
> A timeout parameter, "hbase.ip.to.rack.determiner.timeout", is proposed whose
> value governs the duration which RackManager waits before rack resolution is
> stopped.
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