Persists Lucene.Net index files in Azure Blob Storage.
Provides two Lucene.Net.Store.Directory implementations that persist index files in Azure Blob Storage. Compared to
other packages which have limitations such as storing index files only at the root of containers, the directories in
this packages do allow for greater configurational flexibility and they can be used to keep index files in folders in
blob storage.
The class Lucene.Net.Store.FileBackedAzureBlobDirectory always stores downloaded files in a FSDirectory passed to
the constructor. This is the preferred way of using Azure blob based indices, as it results in smaller number of calls
to Azure Storage Blob APIs. It always locks the index through Azure blob locks, and always writes on the FSDirectory
first and only syncs changes to blobs on commit.
The class Lucene.Net.Store.AzureBlobDirectory on the other hand does not automatically cache index files in a
local FSDirectory or RAMDirectory. It can therefore be used much more flexibly and combined with other Directory
implementations such as Lucene.Net.Store.CachedRemote
as needed without code changes on the Directory to match your requirements, including write-through or local
locking. That does however come with a higher number of Azure Storage Blob API calls. Tests have shown that the number
of calls can be between 2 and 10 times as high as with the FileBackedAzureBlobDirectory.
There are currently two separate major versions active. The reason for this is that each version targets a different Nuget package for Azure Storage Blob Service interaction. The table below explains which major version is for what.
| Major Version | Target Nuget Packages for Blob Service |
|---|---|
| 0.* | Microsoft.Azure.Storage.Blob (11.*) |
| 1.* | Azure.Storage.Blobs (12.*) |
The Microsoft.Azure.Storage.Blob package has been deprecated, but people are probably still using it for a while
given that switching to Azure.Storage.Blobs can be somewhat time consuming. Accordingly, I will try to keep both
maintained for a while.