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https://issues.apache.org/jira/browse/HBASE-6387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413552#comment-13413552
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stack commented on HBASE-6387:
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HServerAddress is deprecated in trunk, replaced. On deserialization was doing a
dns lookup. So this is 0.89fb only Mikhail?
> Cache DNS lookups in HServerAddress
> -----------------------------------
>
> Key: HBASE-6387
> URL: https://issues.apache.org/jira/browse/HBASE-6387
> Project: HBase
> Issue Type: Improvement
> Reporter: Mikhail Bautin
>
> We have noticed that we rely on DNS lookups in some critical paths by using
> HServerAddress, and Java only seems to be caching DNS data for 30 seconds by
> default. Also, if DNS is down, Java's negative cache of DNS will ensure that
> many successive attempts fail. However, we cannot just increase
> networkaddress.cache.ttl to a large value, because e.g. namenode failover may
> require resolving the same DNS name differently. Therefore I propose that we
> add a DNS lookup cache in HServerAddress.
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