使用自定义过滤器过滤Accumulo

时间：2016-02-11 08:40:27

标签： java hadoop accumulo

我写了一个非常简单的自定义过滤器来过滤Accumulo返回的结果。这是我写的过滤器

public class MyFilter extends Filter {

    @Override
    public boolean accept(Key key, Value val) {
        Long page = 1L;
        Integer limit = 25;

        if(key.getColumnQualifier().getBytes().equals("Class".getBytes()) && val.get().equals("1".getBytes())) {
            if(page == 1) {
                return true;
            }
            limit--;
            if(limit == 1L) {
                page++;
                limit = 25;
            }
        }

        return false;
    }
}

我将此过滤器添加到Accumulo的扫描仪中，就像这样

Set<Range> ranges = new HashSet<>();
IteratorSetting iter = new IteratorSetting(15, "MyFilter", MyFilter.class);
myScanner.addScanIterator(iter);
Iterator<Entry<Key, Value>> kys = myScanner.iterator();
while(kys.hasNext()) { // This is line 335 in com.latize.ulysses3.service.AccumuloPivotTable.getRows
    Entry<Key, Value> e = kys.next();
    ranges.add(Range.exact(e.getKey().getRow()));
}

但每当我尝试运行这段代码时，我就会得到这个堆栈跟踪

java.lang.RuntimeException: org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server accumulo.tablet.2:9997
        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:161)
        at com.latize.ulysses3.service.AccumuloPivotTable.getRows(AccumuloPivotTable.java:335)
        at com.latize.ulysses3.webservice.DataVault.getFilteredRows(DataVault.java:950)
        at com.latize.ulysses3.webservice.DataVault$Proxy$_$$_WeldClientProxy.getFilteredRows(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:137)
        at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:280)
        at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:234)
        at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:221)
        at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356)
        at org.jboss.resteasy.core.SynchronousDispatcher.invokePropagateNotFound(SynchronousDispatcher.java:217)
        at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:224)
        at org.jboss.resteasy.plugins.server.servlet.FilterDispatcher.doFilter(FilterDispatcher.java:62)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:189)
        at org.apache.marmotta.platform.core.filters.ModuleResourceFilter.doFilter(ModuleResourceFilter.java:169)
        at org.apache.marmotta.platform.core.filters.ModuleResourceFilter$Proxy$_$$_WeldClientProxy.doFilter(Unknown Source)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:184)
        at com.latize.ulysses.platform.core.filters.ClickJackFilter.doFilter(ClickJackFilter.java:105)
        at com.latize.ulysses.platform.core.filters.ClickJackFilter$Proxy$_$$_WeldClientProxy.doFilter(Unknown Source)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:184)
        at com.latize.ulysses.platform.core.filters.SessionTimeoutCookieFilter.doFilter(SessionTimeoutCookieFilter.java:125)
        at com.latize.ulysses.platform.core.filters.SessionTimeoutCookieFilter$Proxy$_$$_WeldClientProxy.doFilter(Unknown Source)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:184)
        at org.apache.marmotta.platform.core.filters.MarmottaServerNameFilter.doFilter(MarmottaServerNameFilter.java:104)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:184)
        at com.latize.ulysses.platform.core.filters.UlyssesTemplatingFilter.doFilter(UlyssesTemplatingFilter.java:178)
        at com.latize.ulysses.platform.core.filters.UlyssesTemplatingFilter$Proxy$_$$_WeldClientProxy.doFilter(Unknown Source)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:184)
        at org.apache.marmotta.platform.core.filters.TemplatingFilter.doFilter(TemplatingFilter.java:176)
        at org.apache.marmotta.platform.core.filters.TemplatingFilter$Proxy$_$$_WeldClientProxy.doFilter(Unknown Source)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:184)
        at org.apache.marmotta.platform.security.filters.MarmottaAccessControlFilter.doFilter(MarmottaAccessControlFilter.java:142)
        at org.apache.marmotta.platform.security.filters.MarmottaAccessControlFilter$Proxy$_$$_WeldClientProxy.doFilter(Unknown Source)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:184)
        at org.apache.marmotta.platform.user.filters.MarmottaAuthenticationFilter.doFilter(MarmottaAuthenticationFilter.java:228)
        at org.apache.marmotta.platform.user.filters.MarmottaAuthenticationFilter$Proxy$_$$_WeldClientProxy.doFilter(Unknown Source)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter$LMFFilterChain.doFilter(MarmottaResourceFilter.java:184)
        at org.apache.marmotta.platform.core.servlet.MarmottaResourceFilter.doFilter(MarmottaResourceFilter.java:135)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.marmotta.platform.core.servlet.MarmottaPreStartupFilter.doFilter(MarmottaPreStartupFilter.java:106)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:169)
        at com.thetransactioncompany.cors.CORSFilter.doFilter(CORSFilter.java:232)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.marmotta.platform.core.servlet.MarmottaOptionsFilter.doFilter(MarmottaOptionsFilter.java:83)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.accumulo.core.client.impl.AccumuloServerException: Error on server accumulo.tablet.2:9997
        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:293)
        at org.apache.accumulo.core.client.impl.ScannerIterator$Reader.run(ScannerIterator.java:80)
        at org.apache.accumulo.core.client.impl.ScannerIterator.hasNext(ScannerIterator.java:151)
        ... 69 more
Caused by: org.apache.thrift.TApplicationException: Internal error processing startScan
        at org.apache.thrift.TApplicationException.read(TApplicationException.java:111)
        at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:71)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.recv_startScan(TabletClientService.java:232)
        at org.apache.accumulo.core.tabletserver.thrift.TabletClientService$Client.startScan(TabletClientService.java:208)
        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:410)
        at org.apache.accumulo.core.client.impl.ThriftScanner.scan(ThriftScanner.java:285)
        ... 71 more

accumulo.tablet.2：9997是运行我的一台平板电脑服务器的机器的域名。配置很好，因为其他功能正常工作。港口也在上升。有人能告诉我为什么我会收到这个错误？任何帮助将不胜感激。

2 个答案:

答案 0 :(得分：3)

要正确使用过滤器，您必须将它们添加到accumulo类路径中，通常是通过部署.jar文件，其中在$ACCUMULO_HOME/lib或$ACCUMULO_HOME/lib/ext中系统的每个节点上定义了迭代器。为了更深入地理解迭代器，我推荐非常好的documentation of accumulo。

为了便于部署，我建议您使用Jenkins，Puppet或Chef。如果这对您的项目来说是一个很大的努力，那么一个简单的shell脚本也可以。您可能会发现cluster shell cssh对管理问题非常有帮助！请注意，在ext文件夹中部署后， NOT 需要重新启动accumulo，但lib文件夹需要重新启动。

答案 1 :(得分：0)

我遇到了这个问题。当我检查tserver的日志时，我得到了一个ClassNotFound异常。我似乎需要将该类添加到Accumulo的类路径中。但是，如果我想将这些过滤结果作为应用程序的一部分而不是从终端运行它，我将如何去做呢？我可能无法将过滤器添加到Accumulo的类路径中。

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