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java.io.IOException: Too many open files at sun.nio.ch.IOUtil.initPipe(Native Method) at sun.nio.ch.EPollSelectorImpl.<init>(Unknown Source) at sun.nio.ch.EPollSelectorProvider.openSelector(Unknown Source) at sun.nio.ch.Util.getTemporarySelector(Unknown Source) at sun.nio.ch.SocketAdaptor.connect(Unknown Source) at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:1114) at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:956)