[KUDU-2116] kudu client multi thread scanner throw exception:Invalid call sequence ID in scan request

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 1.4.0
• Fix Version/s: NA
• Component/s: client, java
• Environment: java8; Development environment win 7; kudu server version is 'kudu 1.4.0-cdh5.12.0'; kudu client version is '1.4.0'
• Assignee: Todd Lipcon
• Reporter: WangBo
• Created: 28/Aug/17 10:45
• Updated: 02/Jun/20 20:33
• Resolved: 02/Jun/20 20:33

Description

I want to use kudu-client to fetch data.To improve efficiency,I use multi thread to do this.Use KuduScanToken.intoScanner to get KuduScanner,then use KuduScanner to fetch data.In single thread environment,it's ok.but when using multi thread,every thread holds a kuduScanner to fetch data,exception occurs as below:

My title

org.apache.kudu.client.NonRecoverableException: Invalid call sequence ID in scan request
at org.apache.kudu.client.TabletClient.dispatchTSErrorOrReturnException(TabletClient.java:526)
at org.apache.kudu.client.TabletClient.messageReceived(TabletClient.java:456)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
at org.apache.kudu.client.TabletClient.handleUpstream(TabletClient.java:603)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
at org.apache.kudu.client.shaded.org.jboss.netty.handler.timeout.ReadTimeoutHandler.messageReceived(ReadTimeoutHandler.java:184)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
at org.apache.kudu.client.shaded.org.jboss.netty.handler.codec.oneone.OneToOneDecoder.handleUpstream(OneToOneDecoder.java:70)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
at org.apache.kudu.client.shaded.org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
at org.apache.kudu.client.shaded.org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
at org.apache.kudu.client.shaded.org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
at org.apache.kudu.client.shaded.org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
at org.apache.kudu.client.shaded.org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at org.apache.kudu.client.shaded.org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

the client code as below:

public class ScannerTest {

    ExecutorService pool = Executors.newFixedThreadPool(8);

    @Test
    public void scan() throws Exception {
        long begin = System.currentTimeMillis();
        String tableName = "impala::test.test_table";
        KuduClient kuduClient = getKuduClient();
        KuduTable kuduTable = kuduClient.openTable(tableName);
        List<KuduScanToken> kuduScanTokens = kuduClient.newScanTokenBuilder(kuduTable)
                .build();
        List<Future> list = Lists.newArrayList();
        for (int i = 0;i < kuduScanTokens.size();i ++) {
            KuduScanToken kuduScanToken = kuduScanTokens.get(i);
            KuduScanner kuduScanner = kuduScanToken.intoScanner(getKuduClient());
            list.add(pool.submit(new Callable<Object>() {
                public Object call() {
                    String name = Thread.currentThread().getName();
                    try {
                        System.out.println("scan start：" + name);
                        doKuduScan(kuduScanner, name);
                        return name;
                    } catch (KuduException e) {
                        e.printStackTrace();
                        return e.getMessage();
                    }
                }
            }));
        }
        list.forEach(future -> {
            try {
                System.out.println(future.get());
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        });
        pool.shutdown();
    }

    public void doKuduScan(KuduScanner kuduScanner, String threadName) throws KuduException {
        while (kuduScanner.hasMoreRows()) {
            RowResultIterator results = kuduScanner.nextRows();
            System.out.println(threadName + ",num=" + results.getNumRows());
            while (results.hasNext()) {
                RowResult rowResult = results.next();
            }
        }
    }

    public static KuduClient getKuduClient() {
        KuduClient kuduClient = new KuduClient.KuduClientBuilder(hostName).build();
        return kuduClient;
    }

}

the more thread num is,the more easily case occurs

Issue Links

• duplicates: KUDU-1868 Java client mishandles socket read timeouts for scans
• relates to: KUDU-1868 Java client mishandles socket read timeouts for scans