<FindBugsFilter>
     <Match>
       <Package name="org.apache.hadoop.record.compiler.generated" />
     </Match>
     <Match>
       <Package name="org.apache.hadoop.hdfs.protocol.proto" />
     </Match>
     <Match>
       <Package name="org.apache.hadoop.hdfs.server.namenode.ha.proto" />
     </Match>
     <Match>
       <Class name="~org.apache.hadoop.hdfs.server.namenode.FsImageProto.*" />
     </Match>
     <Match>
       <Package name="org.apache.hadoop.hdfs.qjournal.protocol" />
     </Match>
     <Match>
       <Bug pattern="EI_EXPOSE_REP" />
     </Match>
     <Match>
       <Bug pattern="EI_EXPOSE_REP2" />
     </Match>
     <Match>
       <Bug pattern="SE_COMPARATOR_SHOULD_BE_SERIALIZABLE" />
     </Match>
     <Match>
       <Bug pattern="SE_BAD_FIELD" />
     </Match>
     <Match>
       <Class name="~.*_jsp" />
       <Bug pattern="DLS_DEAD_LOCAL_STORE" />
     </Match>
     <Match>
       <Field name="_jspx_dependants" />
       <Bug pattern="UWF_UNWRITTEN_FIELD" />
     </Match>
     <!-- 
       Inconsistent synchronization for Client.Connection.out is
       is intentional to make a connection to be closed instantly. 
     --> 
     <Match>
       <Class name="org.apache.hadoop.ipc.Client$Connection" />
       <Field name="out" />
       <Bug pattern="IS2_INCONSISTENT_SYNC" />
     </Match>
     <!-- 
       Ignore Cross Scripting Vulnerabilities
       We have an input quoting filter that protects us.
     -->
     <Match>
       <Bug code="XSS" />
     </Match>
     <Match>
       <Bug code="HRS" />
     </Match>

     <!-- 
        core changes 
     -->
     <Match>
       <Class name="~org.apache.hadoop.*" />
       <Bug code="MS" />
     </Match>

     <!--
       getTmpInputStreams is pretty much like a stream constructor.
       The newly created streams are not supposed to be closed in the constructor. So ignore
       the OBL warning.
     -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl" />
       <Method name="getTmpInputStreams" />
       <Bug pattern="OBL_UNSATISFIED_OBLIGATION" />
     </Match>

     <!--
      lastAppliedTxid is carefully unsynchronized in the BackupNode in a couple spots.
      See the comments in BackupImage for justification.
     -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.namenode.FSImage" />
       <Field name="lastAppliedTxId" />
       <Bug pattern="IS2_INCONSISTENT_SYNC" />
     </Match>
     <!--
      Findbugs doesn't realize that closing a FilterOutputStream pushes the close down to
      wrapped streams, too.
     -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.namenode.FSImageFormat$Saver" />
       <Method name="save" />
       <Bug pattern="OS_OPEN_STREAM" />
     </Match>
     <!--
      the 'metrics' member is sometimes used from synchronized blocks, sometimes not,
      but it's only reset by test cases, so should be fine
     -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.namenode.FSEditLog" />
       <Field name="metrics" />
       <Bug pattern="IS2_INCONSISTENT_SYNC" />
     </Match>
    <!--
     We use a separate lock to protect modifications to journalSet so that
     FSEditLog#selectInputStreams does not need to be a synchronized method.
    -->
    <Match>
        <Class name="org.apache.hadoop.hdfs.server.namenode.FSEditLog" />
        <Field name="journalSet" />
        <Bug pattern="IS2_INCONSISTENT_SYNC" />
    </Match>
    <!--
      FSEditLog#getTotalSyncCount is not synchronized because this method is
      used by metrics. NullPointerException can happen and it is ignored.
    -->
    <Match>
      <Class name="org.apache.hadoop.hdfs.server.namenode.FSEditLog" />
      <Field name="editLogStream" />
      <Bug pattern="IS2_INCONSISTENT_SYNC" />
    </Match>
    <!--
      FSEditLog#isOpenForWriteWithoutLock and FSEditLog#isSegmentOpenWithoutLock
      are not synchronized because these methods are used by metrics.
    -->
    <Match>
      <Class name="org.apache.hadoop.hdfs.server.namenode.FSEditLog" />
      <Field name="state" />
      <Bug pattern="IS2_INCONSISTENT_SYNC" />
    </Match>
    <!--
      All of the threads which update/increment txid are synchronized,
      so make txid volatile instead of AtomicLong.
    -->
    <Match>
      <Class name="org.apache.hadoop.hdfs.server.namenode.FSEditLog" />
      <Field name="txid" />
      <Bug pattern="VO_VOLATILE_INCREMENT" />
    </Match>
     <!--
      This method isn't performance-critical and is much clearer to write as it's written.
      -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.datanode.BlockPoolManager" />
       <Method name="doRefreshNamenodes" />
       <Bug category="PERFORMANCE" />
     </Match>
     <!-- Don't complain about System.exit() being called from quit() -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.namenode.MetaRecoveryContext" />
       <Method name="quit" />
       <Bug pattern="DM_EXIT" />
     </Match>

     <!-- More complex cleanup logic confuses findbugs -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.qjournal.server.Journal" />
       <Method name="persistPaxosData" />
       <Bug pattern="OS_OPEN_STREAM" />
     </Match>

     <!-- Don't complain about LocalDatanodeInfo's anonymous class -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.client.impl.BlockReaderLocal$LocalDatanodeInfo$1" />
       <Bug pattern="SE_BAD_FIELD_INNER_CLASS" />
     </Match>
     <!-- Only one method increments numFailedVolumes and it is synchronized -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsVolumeList" />
       <Field name="numFailedVolumes" />
       <Bug pattern="VO_VOLATILE_INCREMENT" />
     </Match>
     <!-- Access to pendingReceivedRequests is synchronized -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.datanode.BPServiceActor" />
       <Method name="notifyNamenodeBlockImmediately" />
       <Field name="pendingReceivedRequests" />
       <Bug pattern="VO_VOLATILE_INCREMENT" />
     </Match>
      <!-- Replace System.exit() call with ExitUtil.terminate() -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.tools.JMXGet"/>
       <Method name="main" />
       <Bug pattern="NP_NULL_ON_SOME_PATH" />
     </Match>    
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.datanode.ReplicaInfo" />
       <Method name="setDirInternal" />
       <Bug pattern="DM_STRING_CTOR" />
     </Match>
    <!-- Manually verified to be okay, we want to throw away the top bit here -->
    <Match>
      <Class name="org.apache.hadoop.hdfs.server.namenode.CachedBlock" />
      <Method name="getReplication" />
      <Bug pattern="ICAST_QUESTIONABLE_UNSIGNED_RIGHT_SHIFT" />
    </Match>
    <Match>
      <Class name="org.apache.hadoop.hdfs.protocol.CacheDirective" />
      <Method name="insertInternal" />
      <Bug pattern="BC_UNCONFIRMED_CAST" />
    </Match>
    <Match>
      <Class name="org.apache.hadoop.hdfs.server.blockmanagement.CacheReplicationMonitor" />
      <Bug pattern="RV_RETURN_VALUE_IGNORED_BAD_PRACTICE" />
    </Match>
    <Match>
      <Class name="org.apache.hadoop.hdfs.DFSUtil"/>
      <Method name="assertAllResultsEqual" />
      <Bug pattern="NP_LOAD_OF_KNOWN_NULL_VALUE" />
    </Match>
 </FindBugsFilter>