org.apache.lucene.replicator.nrt

## Class ReplicaNode

- java.lang.Object
- - org.apache.lucene.replicator.nrt.Node
  - - org.apache.lucene.replicator.nrt.ReplicaNode

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public abstract class ReplicaNode
      extends Node

  Replica node, that pulls index changes from the primary node by copying newly flushed or merged index files.
  WARNING: This API is experimental and might change in incompatible ways in the next release.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected CopyJob` | `curNRTCopy` Non-null when we are currently copying files from a new NRT point:
    `protected Collection<String>` | `lastNRTFiles` IncRef'd files in the current NRT point:
    `protected long` | `lastPrimaryGen` Primary gen last time we successfully replicated:
    `protected Set<CopyJob>` | `mergeCopyJobs` Currently running merge pre-copy jobs

    - ### Fields inherited from class org.apache.lucene.replicator.nrt.Node

      `dir, globalStartNS, id, lastFileMetaData, localStartNS, mgr, PRIMARY_GEN_KEY, printStream, searcherFactory, VERBOSE_CONNECTIONS, VERBOSE_FILES, VERSION_KEY`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ReplicaNode(int id, Directory dir, SearcherFactory searcherFactory, PrintStream printStream)`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()`
    `void` | `commit()`
    `IndexOutput` | `createTempOutput(String prefix, String suffix, IOContext ioContext)`
    `void` | `finishCopyFile(String name)`
    `protected void` | `finishNRTCopy(CopyJob job, long startNS)`
    `List<Map.Entry<String,FileMetaData>>` | `getFilesToCopy(Map<String,FileMetaData> files)` Compares incoming per-file identity (id, checksum, header, footer) versus what we have locally and returns the subset of the incoming files that need copying
    `boolean` | `isClosed()`
    `boolean` | `isCopying()`
    `protected abstract void` | `launch(CopyJob job)` Runs this job async'd
    `protected CopyJob` | `launchPreCopyMerge(AtomicBoolean finished, long newPrimaryGen, Map<String,FileMetaData> files)`
    `protected void` | `maybeNewPrimary(long newPrimaryGen)` Called when the primary changed
    `protected abstract CopyJob` | `newCopyJob(String reason, Map<String,FileMetaData> files, Map<String,FileMetaData> prevFiles, boolean highPriority, CopyJob.OnceDone onceDone)` Start a background copying job, to copy the specified files from the current primary node.
    `CopyJob` | `newNRTPoint(long newPrimaryGen, long version)` Call this to notify this replica node that a new NRT infos is available on the primary.
    `protected abstract void` | `sendNewReplica()` Tell primary we (replica) just started, so primary can tell us to warm any already warming merges.
    `protected void` | `start(long curPrimaryGen)` Start up this replica, which possibly requires heavy copying of files from the primary node, if we were down for a long time
    `void` | `startCopyFile(String name)`

    - ### Methods inherited from class org.apache.lucene.replicator.nrt.Node

      `bytesToString, getCurrentSearchingVersion, getDirectory, getSearcherManager, message, name, nodeMessage, nodeMessage, readLocalFileMetaData, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### lastNRTFiles

          protected final Collection<String> lastNRTFiles

      IncRef'd files in the current NRT point:

    - #### mergeCopyJobs

          protected final Set<CopyJob> mergeCopyJobs

      Currently running merge pre-copy jobs

    - #### curNRTCopy

          protected CopyJob curNRTCopy

      Non-null when we are currently copying files from a new NRT point:

    - #### lastPrimaryGen

          protected long lastPrimaryGen

      Primary gen last time we successfully replicated:

  - ### Constructor Detail

    - #### ReplicaNode

          public ReplicaNode(int id,
                             Directory dir,
                             SearcherFactory searcherFactory,
                             PrintStream printStream)
                      throws IOException

      Throws:
        `IOException`

  - ### Method Detail

    - #### start

          protected void start(long curPrimaryGen)
                        throws IOException

      Start up this replica, which possibly requires heavy copying of files from the primary node, if we were down for a long time
      Throws:
        `IOException`

    - #### commit

          public void commit()
                      throws IOException

      Specified by:
        `commit` in class `Node`
      Throws:
        `IOException`

    - #### finishNRTCopy

          protected void finishNRTCopy(CopyJob job,
                                       long startNS)
                                throws IOException

      Throws:
        `IOException`

    - #### newCopyJob

          protected abstract CopyJob newCopyJob(String reason,
                                                Map<String,FileMetaData> files,
                                                Map<String,FileMetaData> prevFiles,
                                                boolean highPriority,
                                                CopyJob.OnceDone onceDone)
                                         throws IOException

      Start a background copying job, to copy the specified files from the current primary node. If files is null then the latest copy state should be copied. If prevJob is not null, then the new copy job is replacing it and should 1) cancel the previous one, and 2) optionally salvage e.g. partially copied and, shared with the new copy job, files.
      Throws:
        `IOException`

    - #### launch

          protected abstract void launch(CopyJob job)

      Runs this job async'd

    - #### sendNewReplica

          protected abstract void sendNewReplica()
                                          throws IOException

      Tell primary we (replica) just started, so primary can tell us to warm any already warming merges. This lets us keep low nrt refresh time for the first nrt sync after we started.
      Throws:
        `IOException`

    - #### newNRTPoint

          public CopyJob newNRTPoint(long newPrimaryGen,
                                     long version)
                              throws IOException

      Call this to notify this replica node that a new NRT infos is available on the primary. We kick off a job (runs in the background) to copy files across, and open a new reader once that's done.
      Throws:
        `IOException`

    - #### isCopying

          public boolean isCopying()

    - #### isClosed

          public boolean isClosed()

      Specified by:
        `isClosed` in class `Node`

    - #### close

          public void close()
                     throws IOException

      Throws:
        `IOException`

    - #### maybeNewPrimary

          protected void maybeNewPrimary(long newPrimaryGen)
                                  throws IOException

      Called when the primary changed
      Throws:
        `IOException`

    - #### launchPreCopyMerge

          protected CopyJob launchPreCopyMerge(AtomicBoolean finished,
                                               long newPrimaryGen,
                                               Map<String,FileMetaData> files)
                                        throws IOException

      Throws:
        `IOException`

    - #### createTempOutput

          public IndexOutput createTempOutput(String prefix,
                                              String suffix,
                                              IOContext ioContext)
                                       throws IOException

      Throws:
        `IOException`

    - #### getFilesToCopy

          public List<Map.Entry<String,FileMetaData>> getFilesToCopy(Map<String,FileMetaData> files)
                                                              throws IOException

      Compares incoming per-file identity (id, checksum, header, footer) versus what we have locally and returns the subset of the incoming files that need copying
      Throws:
        `IOException`

    - #### startCopyFile

          public void startCopyFile(String name)

    - #### finishCopyFile

          public void finishCopyFile(String name)

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