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When appends enabled,/api/query/last not work #1632

@designershao

Description

@designershao

version: 2.4.0
description:
when enable appends, use /api/query/last api, the system will throw NullPointerException.

query:

    {
        "queries": [
            {
                "metric": "test"
            }
        ]
    }

log:

    java.lang.NullPointerException: null
        at net.opentsdb.tsd.HttpSerializer.formatErrorV1(HttpSerializer.java:855) ~[classes/:na]
        at net.opentsdb.tsd.HttpQuery.badRequest(HttpQuery.java:411) ~[classes/:na]
        at net.opentsdb.tsd.RpcHandler.handleHttpQuery(RpcHandler.java:295) ~[classes/:na]
        at net.opentsdb.tsd.RpcHandler.messageReceived(RpcHandler.java:133) ~[classes/:na]
        at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.timeout.IdleStateAwareChannelUpstreamHandler.handleUpstream(IdleStateAwareChannelUpstreamHandler.java:36) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.timeout.IdleStateHandler.messageReceived(IdleStateHandler.java:294) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.http.HttpContentEncoder.messageReceived(HttpContentEncoder.java:82) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:88) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.http.HttpContentDecoder.messageReceived(HttpContentDecoder.java:108) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.http.HttpChunkAggregator.messageReceived(HttpChunkAggregator.java:145) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:459) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:536) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:435) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.SimpleChannelHandler.messageReceived(SimpleChannelHandler.java:142) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:88) [netty-3.10.6.Final.jar:na]
        at net.opentsdb.tsd.ConnectionManager.handleUpstream(ConnectionManager.java:128) [classes/:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) [netty-3.10.6.Final.jar:na]
        at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) [netty-3.10.6.Final.jar:na]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_101]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_101]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_101]

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