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[Wicket-ja-user 283] Re: tomcat clusteringについて

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Takayoshi Kimura takay****@gmail*****
2008年 12月 17日 (水) 18:15:10 JST 

面白いエラーですね。

原因はHttpSessionに格納されるWicketのクラスの復元処理にコンテキス
ト依存というかスレッド依存の部分がある(Application.get())ためです。
結果的にレプリケーションは失敗してます。Wicketにバグ登録(カテゴリ
はバグというよりエンハンスメントかな)するのが良いでしょうね。

JBoss ASならそのまんまで動作すると思います :-)

Regards,
Yet another Kimura

2008/12/17 木村亮 <exten****@gmail*****>:
> みなさん。はじめまして、ryo といいます。
>
> はじめて、投稿させていただきます。よろしくお願いします。
>
> wicketを利用してアプリケーション開発を行っていて、
> どうしてもうまくない現象がおこってしまいます。質問させてください。
>
> [アプリの大まかな構成]
> ・wicket 1.4-m3
> ・google-guice 1.0
> ・quartz (job sched) 1.6.2
> [サーバ構成]
> ・apache
> ・mod_jk
> ・tomcat-5.5.23 (options -Xms256m -Xmx512 -XX:PermSize=64m
> -XX:MaxPermSize=128m)
>     ・(tomcat物理サーバが3台、バランシングはしておらず、
>     セッションレプリケーション(SimpleTcpClusterを利用)のみを行う。スティッキーセッションは無効です。)
>     ・同一tomcatインスタンスには、他にも5つ6つサービスがのっています。
>     ・tomcat　server.xmlは以下のような感じです。
> 　※http://cwiki.apache.org/WICKET/tomcat-clustering.htmlに記述してあるCluster定義とほぼ、一緒です。
> 　異なる点はSenderのreplicationModeがsynchronousではなく、pooledを指定、expireSessionsOnShutdownを"true"にしています。
>
> <Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
> managerClassName="org.apache.catalina.cluster.session.DeltaManager"
> expireSessionsOnShutdown="true"
> useDirtyFlag="true">
>
> <Membership
> className="org.apache.catalina.cluster.mcast.McastService"
> mcastAddr="XXXXXXXX"
> mcastPort="XXXXXXXX"
> mcastFrequency="500"
> mcastDropTime="3000"/>
>
> <Receiver
> className="org.apache.catalina.cluster.tcp.ReplicationListener"
> tcpListenAddress="auto"　← /etc/hostsをみにいく
> tcpListenPort="XXXXXXX"
> tcpSelectorTimeout="100"
> tcpThreadCount="2"/>
>
> <Sender
> className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
> replicationMode="pooled"/>
>
> <Valve
> className="org.apache.catalina.cluster.tcp.ReplicationValve"
> filter=".*\.gif;.*\.js;.*\.jpg;.*\.htm;.*\.html;.*\.txt;.*\.css"/>
> </Cluster>
>
> 以上の状況で、アプリにリクエストを送ると、以下のような例外が吐かれます。
> 2008/12/16 19:26:04 org.apache.catalina.cluster.session.DeltaManager
> messageReceived
> 致命的: Manager [/context]: Unable to receive message through TCP channel
> java.lang.IllegalArgumentException: Unknown object type null
>         at
> org.apache.wicket.protocol.http.pagestore.DiskPageStore.restoreAfterSerialization(DiskPageStore.java:1215)
>         at
> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore$SecondLevelCachePageMap.readObject(SecondLevelCacheSessionStore.java:406)flect.NativeMethodAccessorImpl.invoke0(Native
> Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:585)
>         at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
>         at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
>         at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
>         at
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>         at
> org.apache.catalina.cluster.session.DeltaRequest$AttributeInfo.readExternal(DeltaRequest.java:335)
>         at
> org.apache.catalina.cluster.session.DeltaRequest.readExternal(DeltaRequest.java:247)
>         at
> org.apache.catalina.cluster.session.DeltaManager.loadDeltaRequest(DeltaManager.java:698)
>         at
> org.apache.catalina.cluster.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:1573)
>         at
> org.apache.catalina.cluster.session.DeltaManager.messageReceived(DeltaManager.java:1523)
>         at
> org.apache.catalina.cluster.session.DeltaManager.messageDataReceived(DeltaManager.java:1272)
>         at
> org.apache.catalina.cluster.session.ClusterSessionListener.messageReceived(ClusterSessionListener.java:86)
>         at
> org.apache.catalina.cluster.tcp.SimpleTcpCluster.receive(SimpleTcpCluster.java:1168)
>         at
> org.apache.catalina.cluster.tcp.ClusterReceiverBase.messageDataReceived(ClusterReceiverBase.java:427)
>         at
> org.apache.catalina.cluster.io.ObjectReader.execute(ObjectReader.java:108)
>         at
> org.apache.catalina.cluster.tcp.TcpReplicationThread.drainChannel(TcpReplicationThread.java:139)
>         at
> org.apache.catalina.cluster.tcp.TcpReplicationThread.run(TcpReplicationThread.java:70)
> Exception in thread
> "org.apache.catalina.cluster.tcp.TcpReplicationThread[1]"
> java.lang.ExceptionInInitializerError
>         at sun.misc.Unsafe.ensureClassInitialized(Native Method)
>         at
> sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:25)
>         at
> sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:122)
>         at java.lang.reflect.Field.acquireFieldAccessor(Field.java:917)
>         at java.lang.reflect.Field.getFieldAccessor(Field.java:898)
>         at java.lang.reflect.Field.getLong(Field.java:527)
>         at
> java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1586)
>         at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:52)
>         at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:408)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:400)
>         at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:297)
>         at
> java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:531)
>         at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1552)
>         at
> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
>         at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699)
>         at
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>         at
> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore$SecondLevelCachePageMap.readObject(SecondLevelCacheSessionStore.java:403)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:585)
>         at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
>         at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
>         at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
>         at
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>         at
> org.apache.catalina.cluster.session.DeltaRequest$AttributeInfo.readExternal(DeltaRequest.java:335)
>         at
> org.apache.catalina.cluster.session.DeltaRequest.readExternal(DeltaRequest.java:247)
>         at
> org.apache.catalina.cluster.session.DeltaManager.loadDeltaRequest(DeltaManager.java:698)
>         at
> org.apache.catalina.cluster.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:1573)
>         at
> org.apache.catalina.cluster.session.DeltaManager.messageReceived(DeltaManager.java:1523)
>         at
> org.apache.catalina.cluster.session.DeltaManager.messageDataReceived(DeltaManager.java:1272)
>         at
> org.apache.catalina.cluster.session.ClusterSessionListener.messageReceived(ClusterSessionListener.java:86)
>         at
> org.apache.catalina.cluster.tcp.SimpleTcpCluster.receive(SimpleTcpCluster.java:1168)
>         at
> org.apache.catalina.cluster.tcp.ClusterReceiverBase.messageDataReceived(ClusterReceiverBase.java:427)
>         at
> org.apache.catalina.cluster.io.ObjectReader.execute(ObjectReader.java:108)
>         at
> org.apache.catalina.cluster.tcp.TcpReplicationThread.drainChannel(TcpReplicationThread.java:139)
>         at
> org.apache.catalina.cluster.tcp.TcpReplicationThread.run(TcpReplicationThread.java:70)
> Caused by: org.apache.wicket.WicketRuntimeException: There is no application
> attached to current thread
> org.apache.catalina.cluster.tcp.TcpReplicationThread[1]
>         at org.apache.wicket.Application.get(Application.java:177)
>         at org.apache.wicket.Component.getApplication(Component.java:1277)
>         at org.apache.wicket.Component.<init>(Component.java:893)
>         at
> org.apache.wicket.MarkupContainer.<init>(MarkupContainer.java:108)
>         at org.apache.wicket.Page.<init>(Page.java:238)
>         at
> org.apache.wicket.protocol.http.pagestore.SerializedPagesCache$SerializedPageWithSession$1.<init>(SerializedPagesCache.java:206)
>         at
> org.apache.wicket.protocol.http.pagestore.SerializedPagesCache$SerializedPageWithSession.<clinit>(SerializedPagesCache.java:205)
>         ... 40 more
> Exception in thread
> "org.apache.catalina.cluster.tcp.TcpReplicationThread[2]"
> java.lang.ExceptionInInitializerError
>         at sun.misc.Unsafe.ensureClassInitialized(Native Method)
>         at
> sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:25)
>         at
> sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:122)
>         at java.lang.reflect.Field.acquireFieldAccessor(Field.java:917)
>         at java.lang.reflect.Field.getFieldAccessor(Field.java:898)
>         at java.lang.reflect.Field.getLong(Field.java:527)
>         at
> java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java:1586)
>         at java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:52)
>         at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:408)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:400)
>         at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:297)
>         at
> java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:531)
>         at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1552)
>         at
> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
>         at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699)
>         at
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>         at
> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore$SecondLevelCachePageMap.readObject(SecondLevelCacheSessionStore.java:403)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at java.lang.reflect.Method.invoke(Method.java:585)
>         at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
>         at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
>         at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
>         at
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>         at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>         at
> org.apache.catalina.cluster.session.DeltaRequest$AttributeInfo.readExternal(DeltaRequest.java:335)
>         at
> org.apache.catalina.cluster.session.DeltaRequest.readExternal(DeltaRequest.java:247)
>         at
> org.apache.catalina.cluster.session.DeltaManager.loadDeltaRequest(DeltaManager.java:698)
>         at
> org.apache.catalina.cluster.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:1573)
>         at
> org.apache.catalina.cluster.session.DeltaManager.messageReceived(DeltaManager.java:1523)
>         at
> org.apache.catalina.cluster.session.DeltaManager.messageDataReceived(DeltaManager.java:1272)
>         at
> org.apache.catalina.cluster.session.ClusterSessionListener.messageReceived(ClusterSessionListener.java:86)
>         at
> org.apache.catalina.cluster.tcp.SimpleTcpCluster.receive(SimpleTcpCluster.java:1168)
>         at
> org.apache.catalina.cluster.tcp.ClusterReceiverBase.messageDataReceived(ClusterReceiverBase.java:427)
>         at
> org.apache.catalina.cluster.io.ObjectReader.execute(ObjectReader.java:108)
>         at
> org.apache.catalina.cluster.tcp.TcpReplicationThread.drainChannel(TcpReplicationThread.java:139)
>         at
> org.apache.catalina.cluster.tcp.TcpReplicationThread.run(TcpReplicationThread.java:70)
>
> Caused by: org.apache.wicket.WicketRuntimeException: There is no application
> attached to current thread
> org.apache.catalina.cluster.tcp.TcpReplicationThread[1]
>         at org.apache.wicket.Application.get(Application.java:177)
>         at org.apache.wicket.Component.getApplication(Component.java:1277)
>         at org.apache.wicket.Component.<init>(Component.java:893)
>         at
> org.apache.wicket.MarkupContainer.<init>(MarkupContainer.java:108)
>         at org.apache.wicket.Page.<init>(Page.java:238)
>         at
> org.apache.wicket.protocol.http.pagestore.SerializedPagesCache$SerializedPageWithSession$1.<init>(SerializedPagesCache.java:206)
>         at
> org.apache.wicket.protocol.http.pagestore.SerializedPagesCache$SerializedPageWithSession.<clinit>(SerializedPagesCache.java:205)
>         ... 40 moreorg.apache.catalina.cluster.tcp.TcpReplicationThread
>
> このスタックトレースを見る限りだと、org.apache.catalina.cluster.tcp.TcpReplicationThreadのThreadLocalからApplicationオブジェクトが取得できずに、
> WicketRuntimeExceptionをはいています。
>
> これは、単純に、セッションレプリケーションができていないとみなしてよいでしょうか？
> tomcatの一時領域には、disk page storeファイルが出力されていました。(1台のみ)
>
> スタックトレースの
> at
> org.apache.wicket.protocol.http.pagestore.DiskPageStore.restoreAfterSerialization(DiskPageStore.java:1215)
> のソースを追ってみると、SecondLevelCacheSessionStore$SecondLevelCachePageMap
> クラスの以下の箇所で、IllegalArgumentExceptionが投げられていました。
>
> private void readObject(java.io.ObjectInputStream s) throws IOException,
>             ClassNotFoundException
>         {
>             s.defaultReadObject();
>
>             IPageStore store = getPageStore();
>
>             if (sessionId != null && store instanceof IClusteredPageStore ==
> false)
>             {
>                 Object lastPage = s.readObject();
>                 if (store instanceof ISerializationAwarePageStore)
>                 {
>                     lastPage =
> ((ISerializationAwarePageStore)store).restoreAfterSerialization((Serializable)lastPage);　←ここ
>                 }
>                 this.lastPage = lastPage;
>             }
>         }
>
> DiskPageStore.restoreAfterSerializationメソッド、
>
> 　/**
>      * @see
> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore.ISerializationAwarePageStore#restoreAfterSerialization(java.io.Serializable)
>      */
>     public Object restoreAfterSerialization(Serializable serializable)
>     {
>         if (!storeAfterSessionReplication() || serializable instanceof Page)
>         {
>             return serializable;
>         }
>         else if (serializable instanceof SerializedPageWithSession)
>         {
>             SerializedPageWithSession page =
> (SerializedPageWithSession)serializable;
>             if (page.page == null || page.page.get() !=
> SerializedPageWithSession.NO_PAGE)
>             {
>                 storeSerializedPages(page.sessionId, page.pages);
>                 return stripSerializedPage(page);
>             }
>             else
>             {
>                 return page;
>             }
>         }
>         else
>         {
>             String type = serializable != null ?
> serializable.getClass().getName() : null;
>             throw new IllegalArgumentException("Unknown object type " +
> type);　←ここでIllegalArgumentExceptionがスロー
>         }
>     }
> 引数に渡されるserializable(SecondLevelCacheSessionStore$SecondLevelCachePageMap#readObject(ObjectInputStreamから読み込んだlastPage)がnullのため、IllegalArgumentExceptionをスローしていました。
> なぜ、このような状況になるのかの原因の切り分けが現状できていません。
>
> 何か、参考になるようなことがあれば、ご教授いただきたく投稿させていただきました。
> 以上よろしくお願いいたします。
>
> _______________________________________________
> Wicket-ja-user mailing list
> Wicke****@lists*****
> http://lists.sourceforge.jp/mailman/listinfo/wicket-ja-user
>
>

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