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java.lang.AssertionError: null	at org.apache.cassandra.io.compress.CompressionMetadata$Chunk.(CompressionMetadata.java:475)	at org.apache.cassandra.io.compress.CompressionMetadata.chunkFor(CompressionMetadata.java:240)	at org.apache.cassandra.io.util.MmappedRegions.updateState(MmappedRegions.java:158)	at org.apache.cassandra.io.util.MmappedRegions.(MmappedRegions.java:73)	at org.apache.cassandra.io.util.MmappedRegions.(MmappedRegions.java:61)	at org.apache.cassandra.io.util.MmappedRegions.map(MmappedRegions.java:99)	at org.apache.cassandra.io.util.CompressedSegmentedFile.(CompressedSegmentedFile.java:44)	at org.apache.cassandra.io.util.CompressedSegmentedFile$Builder.complete(CompressedSegmentedFile.java:135)	at org.apache.cassandra.io.util.SegmentedFile$Builder.complete(SegmentedFile.java:181)	at org.apache.cassandra.io.util.SegmentedFile$Builder.buildData(SegmentedFile.java:192)	at org.apache.cassandra.io.sstable.format.big.BigTableWriter.openEarly(BigTableWriter.java:271)	at org.apache.cassandra.io.sstable.SSTableRewriter.maybeReopenEarly(SSTableRewriter.java:182)	at org.apache.cassandra.io.sstable.SSTableRewriter.append(SSTableRewriter.java:134)	at org.apache.cassandra.db.compaction.writers.DefaultCompactionWriter.realAppend(DefaultCompactionWriter.java:65)	at org.apache.cassandra.db.compaction.writers.CompactionAwareWriter.append(CompactionAwareWriter.java:141)	at org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:187)	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)	at org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:82)	at org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:60)	at org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:264)	at java.util.concurrent.Executors$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)