2015-10-11 10:38:48,213 FATAL org.apache.hadoop.hdfs.server.namenode.FSEditLog: Error: flush failed for required journal 

(JournalAndStream(mgr=QJM to [10.78.177.30:8485, 10.78.177.31:8485, 10.78.177.32:8485], stream=QuorumOutputStream starting at txid 28822509))

java.io.IOException: Timed out waiting 20000ms for a quorum of nodes to respond.

        at org.apache.hadoop.hdfs.qjournal.client.AsyncLoggerSet.waitForWriteQuorum(AsyncLoggerSet.java:137)

        at org.apache.hadoop.hdfs.qjournal.client.QuorumOutputStream.flushAndSync(QuorumOutputStream.java:107)

        at org.apache.hadoop.hdfs.server.namenode.EditLogOutputStream.flush(EditLogOutputStream.java:113)

        at org.apache.hadoop.hdfs.server.namenode.EditLogOutputStream.flush(EditLogOutputStream.java:107)

        at org.apache.hadoop.hdfs.server.namenode.JournalSet$JournalSetOutputStream$8.apply(JournalSet.java:490)

        at org.apache.hadoop.hdfs.server.namenode.JournalSet.mapJournalsAndReportErrors(JournalSet.java:350)

        at org.apache.hadoop.hdfs.server.namenode.JournalSet.access$100(JournalSet.java:55)

        at org.apache.hadoop.hdfs.server.namenode.JournalSet$JournalSetOutputStream.flush(JournalSet.java:486)

        at org.apache.hadoop.hdfs.server.namenode.FSEditLog.logSync(FSEditLog.java:581)

        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2310)

        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:480)

        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:297)

        at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:44080)

        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:453)

        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1002)

        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1695)

        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1691)

        at java.security.AccessController.doPrivileged(Native Method)

        at javax.security.auth.Subject.doAs(Subject.java:415)

        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1408)