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Merge pull request #566 from metamx/fix-cached-segments-order

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preserve segment order when pulling from cache
This commit is contained in:
fjy 2014-05-28 12:12:13 -06:00
commit da4972716a
1 changed files with 2 additions and 1 deletions
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server/src/main/java/io/druid/client/CachingClusteredClient.java
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@ -183,7 +183,8 @@ public class CachingClusteredClient<T> implements QueryRunner<T>
} }
if (queryCacheKey != null) { if (queryCacheKey != null) {
Map<Pair<ServerSelector, SegmentDescriptor>, Cache.NamedKey> cacheKeys = Maps.newHashMap(); // cache keys must preserve segment ordering, in order for shards to always be combined in the same order
Map<Pair<ServerSelector, SegmentDescriptor>, Cache.NamedKey> cacheKeys = Maps.newLinkedHashMap();
for (Pair<ServerSelector, SegmentDescriptor> segment : segments) { for (Pair<ServerSelector, SegmentDescriptor> segment : segments) {
final Cache.NamedKey segmentCacheKey = CacheUtil.computeSegmentCacheKey( final Cache.NamedKey segmentCacheKey = CacheUtil.computeSegmentCacheKey(
segment.lhs.getSegment().getIdentifier(), segment.lhs.getSegment().getIdentifier(),