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java.lang.OutOfMemoryError: Java heap space	at org.apache.cassandra.io.util.MmappedSegmentedFile$Builder.deserializeBounds(MmappedSegmentedFile.java:411)	at org.apache.cassandra.io.sstable.format.SSTableReader.loadSummary(SSTableReader.java:850)	at org.apache.cassandra.io.sstable.format.SSTableReader.load(SSTableReader.java:700)	at org.apache.cassandra.io.sstable.format.SSTableReader.load(SSTableReader.java:672)	at org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:466)	at org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:371)	at org.apache.cassandra.io.sstable.format.SSTableReader$4.run(SSTableReader.java:509)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	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)