Package org.apache.druid.client

Interface ServerView.SegmentCallback

    • Method Detail

      • segmentAdded

        ServerView.CallbackAction segmentAdded​(DruidServerMetadata server,
                                       org.apache.druid.timeline.DataSegment segment)
        Called when a segment is added to a server. The return value indicates if this callback has completed its work. Note that even if this callback indicates that it should be unregistered, it is not possible to guarantee that this callback will not get called again. There is a race condition between when this callback runs and other events that can cause the callback to be queued for running. Thus, callbacks shouldn't assume that they will not get called again after they are done. The contract is that the callback will eventually be unregistered, enforcing a happens-before relationship is not part of the contract.
        Parameters:
        server - The server that added a segment
        segment - The segment that was added
        Returns:
        UNREGISTER if the callback has completed its work and should be unregistered. CONTINUE if the callback should remain registered.

      • segmentRemoved

        ServerView.CallbackAction segmentRemoved​(DruidServerMetadata server,
                                         org.apache.druid.timeline.DataSegment segment)
        Called when a segment is removed from a server. The return value indicates if this callback has completed its work. Note that even if this callback indicates that it should be unregistered, it is not possible to guarantee that this callback will not get called again. There is a race condition between when this callback runs and other events that can cause the callback to be queued for running. Thus, callbacks shouldn't assume that they will not get called again after they are done. The contract is that the callback will eventually be unregistered, enforcing a happens-before relationship is not part of the contract.
        Parameters:
        server - The server that removed a segment
        segment - The segment that was removed
        Returns:
        UNREGISTER if the callback has completed its work and should be unregistered. CONTINUE if the callback should remain registered.

      • segmentSchemasAnnounced

        ServerView.CallbackAction segmentSchemasAnnounced​(SegmentSchemas segmentSchemas)
        Called when segment schema is announced.
        Parameters:
        segmentSchemas - segment schema
        Returns:
        continue or unregister