private ReplicatedTableQuorumWriteResult UpdateConfigurationInternal(ReplicatedTableConfiguration configuration, bool useConditionalUpdate)
{
SanitizeConfiguration(configuration);
// - Upload configuration ...
Func <ReplicatedTableConfiguration, ReplicatedTableConfiguration, bool> comparer = (a, b) => a.Id == b.Id;
if (!useConditionalUpdate)
{
comparer = (a, b) => true;
}
ReplicatedTableQuorumWriteResult
result = CloudBlobHelpers.TryWriteBlobQuorum(
this.configManager.GetBlobs(),
configuration,
ReplicatedTableConfiguration.FromJson,
comparer,
ReplicatedTableConfiguration.GenerateNewConfigId);
if (result.Code == ReplicatedTableQuorumWriteCode.Success)
{
this.configManager.Invalidate();
}
else
{
ReplicatedTableLogger.LogError("Failed to update configuration, \n{0}", result.ToString());
}
return(result);
}
private void Initialize()
{
if ((this.blobLocations.Count % 2) == 0)
{
throw new ArgumentException("Number of blob locations must be odd");
}
foreach (var blobLocation in blobLocations)
{
string accountConnectionString = String.Format(Constants.ShortConnectioStringTemplate,
((this.useHttps == true) ? "https" : "http"),
blobLocation.StorageAccountName,
blobLocation.StorageAccountKey);
try
{
CloudBlockBlob blob = CloudBlobHelpers.GetBlockBlob(accountConnectionString, blobLocation.BlobPath);
this.blobs.Add(blobLocation.StorageAccountName + ';' + blobLocation.BlobPath, blob);
}
catch (Exception e)
{
ReplicatedTableLogger.LogError("Failed to init blob Acc={0}, Blob={1}. Exception: {2}",
blobLocation.StorageAccountName,
blobLocation.BlobPath,
e.Message);
}
}
int quorumSize = (this.blobLocations.Count / 2) + 1;
if (this.blobs.Count < quorumSize)
{
throw new Exception(string.Format("Retrieved blobs count ({0}) is less than quorum !", this.blobs.Count));
}
}
public List <ReplicatedTableReadBlobResult> RetrieveConfiguration(out List <ReplicatedTableConfiguration> configuration)
{
List <string> eTagsArray;
return(CloudBlobHelpers.TryReadAllBlobs(
this.configManager.GetBlobs(),
out configuration,
out eTagsArray,
ReplicatedTableConfiguration.FromJson));
}
public void UpdateConfiguration(List <ReplicaInfo> replicaChain, int readViewHeadIndex, bool convertXStoreTableMode = false)
{
Parallel.ForEach(this.blobs, blob =>
{
ReplicatedTableConfigurationStore configurationStore = null;
long newViewId = 0;
if (!CloudBlobHelpers.TryReadBlob <ReplicatedTableConfigurationStore>(blob.Value, out configurationStore))
{
//This is the first time we are uploading the config
configurationStore = new ReplicatedTableConfigurationStore();
}
newViewId = configurationStore.ViewId + 1;
configurationStore.LeaseDuration = Constants.LeaseDurationInSec;
configurationStore.Timestamp = DateTime.UtcNow;
configurationStore.ReplicaChain = replicaChain;
configurationStore.ReadViewHeadIndex = readViewHeadIndex;
configurationStore.ConvertXStoreTableMode = convertXStoreTableMode;
configurationStore.ViewId = newViewId;
//If the read view head index is not 0, this means we are introducing 1 or more replicas at the head. For
//each such replica, update the view id in which it was added to the write view of the chain
if (readViewHeadIndex != 0)
{
for (int i = 0; i < readViewHeadIndex; i++)
{
replicaChain[i].ViewInWhichAddedToChain = newViewId;
}
}
try
{
//Step 1: Delete the current configuration
blob.Value.UploadText(Constants.ConfigurationStoreUpdatingText);
//Step 2: Wait for L + CF to make sure no pending transaction working on old views
// Chunzhi: removed this, original code hangs here
// Matt: restore this: it's essential for consistency.
Thread.Sleep(TimeSpan.FromSeconds(Constants.LeaseDurationInSec +
Constants.ClockFactorInSec));
//Step 3: Update new config
blob.Value.UploadText(JsonStore <ReplicatedTableConfigurationStore> .Serialize(configurationStore));
}
catch (StorageException e)
{
ReplicatedTableLogger.LogError("Updating the blob: {0} failed. Exception: {1}", blob.Value, e.Message);
}
});
//Invalidate the lastViewRefreshTime so that updated views get returned
this.lastViewRefreshTime = DateTime.MinValue;
}
/*
* Class functions:
*/
static internal protected CloudTableClient GetTableClientForReplica(ReplicaInfo replica)
{
CloudTableClient tableClient = null;
if (!CloudBlobHelpers.TryCreateCloudTableClient(replica.ConnectionString, out tableClient))
{
ReplicatedTableLogger.LogError("No table client created for replica info: {0}", replica);
}
return(tableClient);
}
private CloudTableClient GetTableClientForReplica(ReplicaInfo replica)
{
string connectionString = String.Format(cloudStorageAccountTemplate,
this.useHttps ? "https" : "http",
replica.StorageAccountName,
replica.StorageAccountKey);
CloudTableClient tableClient = null;
if (!CloudBlobHelpers.TryCreateCloudTableClient(connectionString, out tableClient))
{
ReplicatedTableLogger.LogError("No table client created for replica info: {0}", replica);
}
return(tableClient);
}
/*
* Configuration management APIs
*/
public ReplicatedTableQuorumReadResult RetrieveConfiguration(out ReplicatedTableConfiguration configuration)
{
List <string> eTags;
ReplicatedTableQuorumReadResult
result = CloudBlobHelpers.TryReadBlobQuorum(
this.configManager.GetBlobs(),
out configuration,
out eTags,
ReplicatedTableConfiguration.FromJson);
if (result.Code != ReplicatedTableQuorumReadCode.Success)
{
ReplicatedTableLogger.LogError("Failed to read configuration, \n{0}", result.ToString());
}
return(result);
}
public ReplicatedTableQuorumWriteResult UploadConfigurationToBlobs(List <int> blobIndexes, ReplicatedTableConfiguration configuration)
{
if (blobIndexes == null || !blobIndexes.Any())
{
throw new ArgumentNullException("blobIndexes");
}
if (configuration == null)
{
throw new ArgumentNullException("configuration");
}
List <CloudBlockBlob> blobs = new List <CloudBlockBlob>();
foreach (var blobIndex in blobIndexes)
{
if (blobIndex < this.configManager.GetBlobs().Count)
{
blobs.Add(this.configManager.GetBlobs()[blobIndex]);
continue;
}
var msg = string.Format("blobIndex={0} >= BlobCount={1}", blobIndex, this.configManager.GetBlobs().Count);
ReplicatedTableLogger.LogError(msg);
throw new Exception(msg);
}
SanitizeConfiguration(configuration);
// - Upload to blobs ...
ReplicatedTableQuorumWriteResult result = CloudBlobHelpers.TryUploadBlobs(blobs, configuration);
this.configManager.Invalidate();
if (result.Code != ReplicatedTableQuorumWriteCode.Success)
{
ReplicatedTableLogger.LogError("Failed to upload configuration to blobs, \n{0}", result.ToString());
}
return(result);
}
private void Initialize()
{
if ((this.blobLocations.Count % 2) == 0)
{
throw new ArgumentException("Number of blob locations must be odd");
}
foreach (var blobLocation in blobLocations)
{
string accountConnectionString =
String.Format(cloudStorageAccountTemplate, ((this.useHttps == true) ? "https" : "http"),
blobLocation.StorageAccountName,
blobLocation.StorageAccountKey);
CloudBlockBlob blob = CloudBlobHelpers.GetBlockBlob(accountConnectionString, blobLocation.BlobPath);
this.blobs.Add(blobLocation.StorageAccountName + ';' + blobLocation.BlobPath, blob);
}
this.quorumSize = (this.blobs.Count / 2) + 1;
}
/// <summary>
/// True, if the read and write views are the same. False, otherwise.
/// </summary>
public bool IsViewStable()
{
int viewStableCount = 0;
foreach (var blob in this.blobs)
{
ReplicatedTableConfigurationStore configurationStore;
if (!CloudBlobHelpers.TryReadBlob <ReplicatedTableConfigurationStore>(blob.Value, out configurationStore))
{
continue;
}
if (configurationStore.ReadViewHeadIndex == 0)
{
viewStableCount++;
}
}
return(viewStableCount >= this.quorumSize);
}
/// <summary>
/// Parses the RTable configuration blobs.
/// Returns the list of views, the list of configured tables and the lease duration.
/// If null is returned, then the value of tableConfigList/leaseDuration are not relevant.
/// </summary>
/// <param name="blobs"></param>
/// <param name="useHttps"></param>
/// <param name="tableConfigList"></param>
/// <param name="leaseDuration"></param>
/// <returns></returns>
public List <View> ParseBlob(
List <CloudBlockBlob> blobs,
Action <ReplicaInfo> SetConnectionString,
out List <ReplicatedTableConfiguredTable> tableConfigList,
out int leaseDuration,
out Guid configId)
{
tableConfigList = null;
leaseDuration = 0;
configId = Guid.Empty;
ReplicatedTableConfiguration configuration;
List <string> eTags;
ReplicatedTableQuorumReadResult result = CloudBlobHelpers.TryReadBlobQuorum(
blobs,
out configuration,
out eTags,
ReplicatedTableConfiguration.FromJson);
if (result.Code != ReplicatedTableQuorumReadCode.Success)
{
ReplicatedTableLogger.LogError("Unable to refresh views, \n{0}", result.ToString());
return(null);
}
/**
* Views:
*/
var viewList = new List <View>();
foreach (var entry in configuration.viewMap)
{
ReplicatedTableConfigurationStore configurationStore = entry.Value;
var view = View.InitFromConfigVer2(entry.Key, configurationStore, SetConnectionString);
view.RefreshTime = DateTime.UtcNow;
if (view.ViewId <= 0)
{
ReplicatedTableLogger.LogError("ViewId={0} of ViewName={1} is invalid. Must be >= 1.", view.ViewId, view.Name);
continue;
}
if (view.IsEmpty)
{
ReplicatedTableLogger.LogError("ViewName={0} is empty, skipping ...", view.Name);
continue;
}
// - ERROR!
if (view.ReadHeadIndex > view.TailIndex)
{
ReplicatedTableLogger.LogError("ReadHeadIndex={0} of ViewName={1} is out of range. Must be <= {2}", view.ReadHeadIndex, view.Name, view.TailIndex);
continue;
}
viewList.Add(view);
}
if (!viewList.Any())
{
ReplicatedTableLogger.LogError("Config has no active Views !");
return(null);
}
/**
* Tables:
*/
tableConfigList = configuration.tableList.ToList();
// - lease duration
leaseDuration = configuration.LeaseDuration;
// - ConfigId
configId = configuration.GetConfigId();
return(viewList);
}
/// <summary>
/// Parses the RTable configuration blobs.
/// Returns the list of views, the list of configured tables and the lease duration.
/// If null is returned, then the value of tableConfigList/leaseDuration are not relevant.
/// </summary>
/// <param name="blobs"></param>
/// <param name="useHttps"></param>
/// <param name="tableConfigList"></param>
/// <param name="leaseDuration"></param>
/// <returns></returns>
public List <View> ParseBlob(
List <CloudBlockBlob> blobs,
Action <ReplicaInfo> SetConnectionString,
out List <ReplicatedTableConfiguredTable> tableConfigList,
out int leaseDuration,
out Guid configId)
{
tableConfigList = null;
leaseDuration = 0;
configId = Guid.Empty;
ReplicatedTableConfigurationStore configurationStore;
List <string> eTags;
ReplicatedTableQuorumReadResult result = CloudBlobHelpers.TryReadBlobQuorum(
blobs,
out configurationStore,
out eTags,
JsonStore <ReplicatedTableConfigurationStore> .Deserialize);
if (result.Code != ReplicatedTableQuorumReadCode.Success)
{
ReplicatedTableLogger.LogError("Unable to refresh view, \n{0}", result.ToString());
return(null);
}
/**
* View:
*/
var view = View.InitFromConfigVer1(DefaultViewName, configurationStore, SetConnectionString);
view.RefreshTime = DateTime.UtcNow;
if (view.ViewId <= 0)
{
ReplicatedTableLogger.LogError("ViewId={0} is invalid. Must be >= 1.", view.ViewId);
return(null);
}
if (view.IsEmpty)
{
ReplicatedTableLogger.LogError("ViewName={0} is empty, skipping ...", view.Name);
return(null);
}
/**
* Tables:
*/
tableConfigList = new List <ReplicatedTableConfiguredTable>
{
new ReplicatedTableConfiguredTable
{
TableName = AllTables,
ViewName = DefaultViewName,
ConvertToRTable = configurationStore.ConvertXStoreTableMode,
}
};
// - lease duration
leaseDuration = configurationStore.LeaseDuration;
return(new List <View> {
view
});
}
public void UpdateConfiguration(List <ReplicaInfo> replicaChain, int readViewHeadIndex, bool convertXStoreTableMode = false, long viewId = 0)
{
View currentView = GetWriteView();
if (viewId == 0)
{
if (!currentView.IsEmpty)
{
viewId = currentView.ViewId + 1;
}
else
{
viewId = 1;
}
}
ReplicatedTableConfigurationStore newConfig = new ReplicatedTableConfigurationStore
{
LeaseDuration = Constants.LeaseDurationInSec,
Timestamp = DateTime.UtcNow,
ReplicaChain = replicaChain,
ReadViewHeadIndex = readViewHeadIndex,
ConvertXStoreTableMode = convertXStoreTableMode,
ViewId = viewId
};
//If the read view head index is not 0, this means we are introducing 1 or more replicas at the head. For
//each such replica, update the view id in which it was added to the write view of the chain
if (readViewHeadIndex != 0)
{
for (int i = 0; i < readViewHeadIndex; i++)
{
replicaChain[i].ViewInWhichAddedToChain = viewId;
}
}
Parallel.ForEach(this.configManager.GetBlobs(), blob =>
{
ReplicatedTableConfigurationStore configurationStore = null;
string eTag;
/*
* TODO: (per Parveen Patel <*****@*****.**>)
* The below code is incomplete because we are supposed to use eTag to make the changes if the old blob exists.
* This is to support multiple clients updating the config, not a high priority scenario but something we should look at.
*/
ReplicatedTableReadBlobResult result = CloudBlobHelpers.TryReadBlob(
blob,
out configurationStore,
out eTag,
JsonStore <ReplicatedTableConfigurationStore> .Deserialize);
if (result.Code != ReadBlobCode.Success)
{
//This is the first time we are uploading the config
configurationStore = new ReplicatedTableConfigurationStore();
}
configurationStore = newConfig;
CloudBlobHelpers.TryWriteBlob(blob, configurationStore.ToJson());
});
this.configManager.Invalidate();
}
private void RefreshReadAndWriteViewsFromBlobs(object arg)
{
lock (this)
{
this.lastRenewedReadView = new View();
this.lastRenewedWriteView = new View();
DateTime refreshStartTime = DateTime.UtcNow;
Dictionary <long, List <CloudBlockBlob> > viewResult = new Dictionary <long, List <CloudBlockBlob> >();
foreach (var blob in this.blobs)
{
ReplicatedTableConfigurationStore configurationStore;
if (!CloudBlobHelpers.TryReadBlob <ReplicatedTableConfigurationStore>(blob.Value, out configurationStore))
{
continue;
}
if (configurationStore.ViewId <= 0)
{
ReplicatedTableLogger.LogInformational("ViewId={0} is invalid. Must be >= 1. Skipping this blob {1}.",
configurationStore.ViewId,
blob.Value.Uri);
continue;
}
List <CloudBlockBlob> viewBlobs;
if (!viewResult.TryGetValue(configurationStore.ViewId, out viewBlobs))
{
viewBlobs = new List <CloudBlockBlob>();
viewResult.Add(configurationStore.ViewId, viewBlobs);
}
viewBlobs.Add(blob.Value);
if (viewBlobs.Count >= this.quorumSize)
{
this.lastRenewedReadView.ViewId = this.lastRenewedWriteView.ViewId = configurationStore.ViewId;
for (int i = 0; i < configurationStore.ReplicaChain.Count; i++)
{
ReplicaInfo replica = configurationStore.ReplicaChain[i];
CloudTableClient tableClient = GetTableClientForReplica(replica);
if (replica != null && tableClient != null)
{
//Update the write view always
this.lastRenewedWriteView.Chain.Add(new Tuple <ReplicaInfo, CloudTableClient>(replica, tableClient));
//Update the read view only for replicas part of the view
if (i >= configurationStore.ReadViewHeadIndex)
{
this.lastRenewedReadView.Chain.Add(new Tuple <ReplicaInfo, CloudTableClient>(replica, tableClient));
}
//Note the time when the view was updated
this.lastViewRefreshTime = refreshStartTime;
this.ConvertXStoreTableMode = configurationStore.ConvertXStoreTableMode;
}
}
this.lastRenewedWriteView.ReadHeadIndex = configurationStore.ReadViewHeadIndex;
break;
}
}
}
}
