internal async Task BackupCurrentPartition(Guid task_id, Guid version, EventArgs e)
{
List <PersistedSaveTask> passive_tasks = new List <PersistedSaveTask>();
var cts = m_dmc.m_cloudidx.GetMyPartitionReplicaChunks();
// Backup strategy: back up each chunk only ONCE, by the first replica that holds it.
// XXX this would burden the first replica if it has the most chunks.
// TODO load balance
HashSet <Guid> planned = new HashSet <Guid>();
foreach (var(rep, cks) in cts)
{
passive_tasks.Add(new PersistedSaveTask(cks
.Where(_ => !planned.Contains(_.Id))
.Select(ck => (rep, new PersistedSlice(version, ck.LowKey, ck.HighKey)))));
cks.ForEach(ck => planned.Add(ck.Id));
}
GroupedTask gt = new GroupedTask(passive_tasks, task_id);
await m_taskqueue.PostTask(gt);
await m_taskqueue.Wait(task_id);
// After we successfully dump all partials of the partition to the persisted storage,
// we then proceed to backup the cluster state, including chunk table, name service,
// pending tasks, etc.
var uploader = await m_pstore.Upload(version, m_namesvc.PartitionId, 0, 0);
await m_backupmgr.Backup(uploader, e);
await uploader.FinishUploading();
}
private void BackupWorker(IndexingActivityStatus state, string backupDirectoryPath)
{
try
{
_backupCancellationSource = new CancellationTokenSource();
_backupManager.Backup(state, backupDirectoryPath, SearchManager.Instance,
_backupCancellationSource.Token);
}
catch (Exception e)
{
CollectErrorMessages(e, _backupManager.BackupInfo);
SnTrace.Index.WriteError("SearchService: " + _backupManager.BackupInfo.Message);
}
_backupHistory.Add(_backupManager.BackupInfo.Clone());
SnTrace.Index.Write("SearchService: BackupInfo is added to history.");
_backupManager = null;
_backupCancellationSource.Dispose();
_backupCancellationSource = null;
}