Ejemplo n.º 1
0
        /// <exception cref="System.IO.IOException"/>
        internal static void DoMerge(CheckpointSignature sig, RemoteEditLogManifest manifest
                                     , bool loadImage, FSImage dstImage, FSNamesystem dstNamesystem)
        {
            NNStorage dstStorage = dstImage.GetStorage();

            dstStorage.SetStorageInfo(sig);
            if (loadImage)
            {
                FilePath file = dstStorage.FindImageFile(NNStorage.NameNodeFile.Image, sig.mostRecentCheckpointTxId
                                                         );
                if (file == null)
                {
                    throw new IOException("Couldn't find image file at txid " + sig.mostRecentCheckpointTxId
                                          + " even though it should have " + "just been downloaded");
                }
                dstNamesystem.WriteLock();
                try
                {
                    dstImage.ReloadFromImageFile(file, dstNamesystem);
                }
                finally
                {
                    dstNamesystem.WriteUnlock();
                }
                dstNamesystem.ImageLoadComplete();
            }
            // error simulation code for junit test
            CheckpointFaultInjector.GetInstance().DuringMerge();
            Checkpointer.RollForwardByApplyingLogs(manifest, dstImage, dstNamesystem);
            // The following has the side effect of purging old fsimages/edit logs.
            dstImage.SaveFSImageInAllDirs(dstNamesystem, dstImage.GetLastAppliedTxId());
            dstStorage.WriteAll();
        }