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    Expert tip

    This was a bug at HBase 1.0.1, it has been patched, so an update to 1.0.2 or further should solve the problem. URL for the Jira thread: https://goo.gl/c5oa6f

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via GitHub by dsyu
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java.net.ConnectException: Connection refused	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)	at com.twitter.heron.common.network.HeronClient.handleConnect(HeronClient.java:244)	at com.twitter.heron.common.basics.NIOLooper.handleSelectedKeys(NIOLooper.java:115)	at com.twitter.heron.common.basics.NIOLooper.access$000(NIOLooper.java:32)	at com.twitter.heron.common.basics.NIOLooper$1.run(NIOLooper.java:45)	at com.twitter.heron.common.basics.WakeableLooper.executeTasksOnWakeup(WakeableLooper.java:142)	at com.twitter.heron.common.basics.WakeableLooper.runOnce(WakeableLooper.java:74)	at com.twitter.heron.common.basics.WakeableLooper.loop(WakeableLooper.java:64)	at com.twitter.heron.instance.Gateway.run(Gateway.java:155)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)