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java.lang.OutOfMemoryError: Map failed	at Method)	at	at	at	at	at	at	at io.druid.segment.IndexIO$DefaultIndexIOHandler.convertV8toV9(	at io.druid.segment.IndexMerger.makeIndexFiles(	at io.druid.segment.IndexMerger.merge(	at io.druid.segment.IndexMerger.mergeQueryableIndex(	at io.druid.segment.IndexMerger.mergeQueryableIndex(	at io.druid.segment.realtime.plumber.RealtimePlumber$4.doRun(	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at