druid/docs/content/development/extensions-contrib/google.md

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layout: doc_page
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# Google Cloud Storage

To use this extension, make sure to [include](../../operations/including-extensions.html) `druid-google-extensions` extension.

## Deep Storage

[Google Cloud Storage](https://cloud.google.com/storage/) is another option for deep storage. This requires some additional druid configuration.

|Property|Description|Default|Required?|
|--------|-----------|-------|---------|
|bucket|Name of the Google Cloud bucket|N/A|yes|
|prefix|The path where data is located.|N/A|yes|

## Firehose

#### StaticGoogleBlobStoreFirehose

This firehose ingests events, similar to the StaticS3Firehose, but from an Google Cloud Store.

As with the S3 blobstore, it is assumed to be gzipped if the extension ends in .gz

Sample spec:

```json
"firehose" : {
    "type" : "static-google-blobstore",
    "blobs": [
        {
          "bucket": "foo",
          "path": "/path/to/your/file.json"
        },
        {
          "bucket": "bar",
          "path": "/another/path.json"
        }
    ]
}
```

This firehose provides caching and prefetching features. In IndexTask, a firehose can be read twice if intervals or
shardSpecs are not specified, and, in this case, caching can be useful. Prefetching is preferred when direct scan of objects is slow.

|property|description|default|required?|
|--------|-----------|-------|---------|
|type|This should be `static-google-blobstore`.|N/A|yes|
|blobs|JSON array of Google Blobs.|N/A|yes|
|maxCacheCapacityBytes|Maximum size of the cache space in bytes. 0 means disabling cache.|1073741824|no|
|maxFetchCapacityBytes|Maximum size of the fetch space in bytes. 0 means disabling prefetch.|1073741824|no|
|prefetchTriggerBytes|Threshold to trigger prefetching Google Blobs.|maxFetchCapacityBytes / 2|no|
|fetchTimeout|Timeout for fetching a Google Blob.|60000|no|
|maxFetchRetry|Maximum retry for fetching a Google Blob.|3|no|

Google Blobs:

|property|description|default|required?|
|--------|-----------|-------|---------|
|bucket|Name of the Google Cloud bucket|N/A|yes|
|path|The path where data is located.|N/A|yes|