Optional long-polling based segment announcement via HTTP instead of Zookeeper#3902

Merged

himanshug merged 8 commits intoapache:masterfrom

himanshug:seg_assignment

May 17, 2017

Commits on May 16, 2017

Optional long-polling based segment announcement via HTTP instead of Zookeeper
himanshug
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address review comments
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make endpoint /druid-internal/v1 instead of /druid/internal so that jetty qos filters can be configured easily when needed
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update segment callback initialization to be called only after first segment list fetch has been succeeded from all servers
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address review comments
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remove size check not required anymore as only segment servers announce themselves and not all peon processes
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annouce segment server on historical only after cached segments are loaded
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fix checkstyle errors
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