Examples of org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream

Package org.apache.hadoop.hdfs.server.namenode

Examples of org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream

org.apache.hadoop.hdfs.server.namenode.RedundantEditLogInputStream
A merged input stream that handles failover between different edit logs. We will currently try each edit log stream exactly once. In other words, we don't handle the "ping pong" scenario where different edit logs contain a different subset of the available edits.

  /**
   * Get underlying streams.
   */
  URLLogInputStream[] getStreams(EditLogInputStream str) throws Exception {
    // there is a single redundant stream
    RedundantEditLogInputStream relis = (RedundantEditLogInputStream) str;
    Field streamsF = RedundantEditLogInputStream.class.getDeclaredField("streams");
    streamsF.setAccessible(true);
    EditLogInputStream[] underlyingStreams = (EditLogInputStream[])streamsF.get(relis);
    URLLogInputStream[] urlStreams = new URLLogInputStream[underlyingStreams.length];
    int i = 0;

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  /**
   * Get the journal node we are tailing from, and indicate which stream this is.
   */
  private JournalNode getTailingJN(EditLogInputStream str,
      URLLogInputStream[] tailingStream) throws Exception {
    RedundantEditLogInputStream is = (RedundantEditLogInputStream) str;


    Field curIdxF = RedundantEditLogInputStream.class
        .getDeclaredField("curIdx");
    curIdxF.setAccessible(true);
    int curIdx = curIdxF.getInt(is);

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