Mikhail Bautin created HBASE-6387:
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Summary: 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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