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java.lang.OutOfMemoryError: Map failed	at sun.nio.ch.FileChannelImpl.map0(Native Method)	at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:937)	at com.google.common.io.Files.map(Files.java:864)	at com.google.common.io.Files.map(Files.java:851)	at com.google.common.io.Files.map(Files.java:818)	at com.google.common.io.Files.map(Files.java:790)	at com.metamx.common.io.smoosh.SmooshedFileMapper.mapFile(SmooshedFileMapper.java:124)	at io.druid.segment.IndexIO$DefaultIndexIOHandler.convertV8toV9(IndexIO.java:559)	at io.druid.segment.IndexMerger.makeIndexFiles(IndexMerger.java:1009)	at io.druid.segment.IndexMerger.merge(IndexMerger.java:421)	at io.druid.segment.IndexMerger.mergeQueryableIndex(IndexMerger.java:242)	at io.druid.segment.IndexMerger.mergeQueryableIndex(IndexMerger.java:215)	at io.druid.segment.realtime.plumber.RealtimePlumber$4.doRun(RealtimePlumber.java:536)	at io.druid.common.guava.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:42)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)