Unless I'm missing something, it seems that none of the APIs I've looked at will tell you how many objects are in an <S3 bucket>/<folder>
. Is there any way to get a count?
Using AWS CLI
aws s3 ls s3://mybucket/ --recursive | wc -l
or
aws cloudwatch get-metric-statistics \
--namespace AWS/S3 --metric-name NumberOfObjects \
--dimensions Name=BucketName,Value=BUCKETNAME \
Name=StorageType,Value=AllStorageTypes \
--start-time 2016-11-05T00:00 --end-time 2016-11-05T00:10 \
--period 60 --statistic Average
Note: The above cloudwatch command seems to work for some while not for others. Discussed here: https://forums.aws.amazon.com/thread.jspa?threadID=217050
Using AWS Web Console
https://i.stack.imgur.com/ha1Fp.png
I have approx 50 Million products and it took more than an hour to count using aws s3 ls
There is a --summarize
switch which includes bucket summary information (i.e. number of objects, total size).
Here's the correct answer using AWS cli:
aws s3 ls s3://bucketName/path/ --recursive --summarize | grep "Total Objects:"
Total Objects: 194273
See the documentation
Total Objects: 7235
Total Size: 475566411749
-- so easy.
Although this is an old question, and feedback was provided in 2015, right now it's much simpler, as S3 Web Console has enabled a "Get Size" option:
https://i.stack.imgur.com/euTRb.png
Which provides the following:
https://i.stack.imgur.com/9gTiI.png
There is an easy solution with the S3 API now (available in the AWS cli):
aws s3api list-objects --bucket BUCKETNAME --output json --query "[length(Contents[])]"
or for a specific folder:
aws s3api list-objects --bucket BUCKETNAME --prefix "folder/subfolder/" --output json --query "[length(Contents[])]"
Illegal token value '(Contents[])]'
(version 1.2.9 of aws-cli), when just using --bucket my-bucket
and A client error (NoSuchBucket) occurred when calling the ListObjects operation: The specified bucket does not exist
when using --bucket s3://my-bucket
. (It definitely exists, and has 1000+ files.)
s3api list-objects
command should limit itself to 1000 pagesize, when you perform this query this limit is not in effect. Multiple calls are issued and total number of objects is returned.
If you use the s3cmd command-line tool, you can get a recursive listing of a particular bucket, outputting it to a text file.
s3cmd ls -r s3://logs.mybucket/subfolder/ > listing.txt
Then in linux you can run a wc -l on the file to count the lines (1 line per object).
wc -l listing.txt
-r
in the command is for --recursive
, so it should work for sub-folders as well.
aws s3 ls
rather than s3cmd because it's faster. b.) For large buckets it can take a long time. Took about 5 min for 1mil files. c.) See my answer below about using cloudwatch.
pip install s3cmd
There is no way, unless you
list them all in batches of 1000 (which can be slow and suck bandwidth - amazon seems to never compress the XML responses), or log into your account on S3, and go Account - Usage. It seems the billing dept knows exactly how many objects you have stored!
Simply downloading the list of all your objects will actually take some time and cost some money if you have 50 million objects stored.
Also see this thread about StorageObjectCount - which is in the usage data.
An S3 API to get at least the basics, even if it was hours old, would be great.
https://i.stack.imgur.com/v3QHi.png
2020/10/22
With AWS Console
Use AWS Cloudwatch's metrics
With AWS CLI
Number of objects:
or:
aws s3api list-objects --bucket <BUCKET_NAME> --prefix "<FOLDER_NAME>" | wc -l
or:
aws s3 ls s3://<BUCKET_NAME>/<FOLDER_NAME>/ --recursive --summarize --human-readable | grep "Total Objects"
or with s4cmd:
s4cmd ls -r s3://<BUCKET_NAME>/<FOLDER_NAME>/ | wc -l
Objects size:
aws s3api list-objects --bucket <BUCKET_NAME> --output json --query "[sum(Contents[].Size), length(Contents[])]" | awk 'NR!=2 {print $0;next} NR==2 {print $0/1024/1024/1024" GB"}'
or:
aws s3 ls s3://<BUCKET_NAME>/<FOLDER_NAME>/ --recursive --summarize --human-readable | grep "Total Size"
or with s4cmd:
s4cmd du s3://<BUCKET_NAME>
or with CloudWatch metrics:
aws cloudwatch get-metric-statistics --metric-name BucketSizeBytes --namespace AWS/S3 --start-time 2020-10-20T16:00:00Z --end-time 2020-10-22T17:00:00Z --period 3600 --statistics Average --unit Bytes --dimensions Name=BucketName,Value=<BUCKET_NAME> Name=StorageType,Value=StandardStorage --output json | grep "Average"
aws s3 ls
solution worked great for me, but the previous solution returned a much higher number, because each object returned by aws s3api list-objects
is represented as a JSON object spanning 10 lines. For the record, I'm using aws-cli 2.3.2
2021 Answer
This information is now surfaced in the AWS dashboard. Simply navigate to the bucket and click the Metrics tab.
https://i.stack.imgur.com/Ycup9.png
Go to AWS Billing, then reports, then AWS Usage reports. Select Amazon Simple Storage Service, then Operation StandardStorage. Then you can download a CSV file that includes a UsageType of StorageObjectCount that lists the item count for each bucket.
If you are using AWS CLI on Windows, you can use the Measure-Object
from PowerShell to get the total counts of files, just like wc -l
on *nix.
PS C:\> aws s3 ls s3://mybucket/ --recursive | Measure-Object
Count : 25
Average :
Sum :
Maximum :
Minimum :
Property :
Hope it helps.
In s3cmd, simply run the following command (on a Ubuntu system):
s3cmd ls -r s3://mybucket | wc -l
From the command line in AWS CLI, use ls plus --summarize
. It will give you the list of all of your items and the total number of documents in a particular bucket. I have not tried this with buckets containing sub-buckets:
aws s3 ls "s3://MyBucket" --summarize
It make take a bit long (it took listing my 16+K documents about 4 minutes), but it's faster than counting 1K at a time.
https://i.stack.imgur.com/YnDlo.png
You can easily get the total count and the history if you go to the s3 console "Management" tab and then click on "Metrics"... Screen shot of the tab
NumberOfObjects (count/day)
chart? It would be better since its directly related to the question. In your screenshot, you are showing the BucketSizeBytes (bytes/day)
which, while useful, is not directly related to the issue.
One of the simplest ways to count number of objects in s3 is:
Step 1: Select root folder
Step 2: Click on Actions -> Delete (obviously, be careful - don't delete it)
Step 3: Wait for a few mins aws will show you number of objects and its total size.
As of November 18, 2020 there is now an easier way to get this information without taxing your API requests:
The default, built-in, free dashboard allows you to see the count for all buckets, or individual buckets under the "Buckets" tab. There are many drop downs to filter and sort almost any reasonable metric you would look for.
https://i.stack.imgur.com/yCzcl.png
https://i.stack.imgur.com/d8uay.jpg
None of the APIs will give you a count because there really isn't any Amazon specific API to do that. You have to just run a list-contents and count the number of results that are returned.
The api will return the list in increments of 1000. Check the IsTruncated property to see if there are still more. If there are, you need to make another call and pass the last key that you got as the Marker property on the next call. You would then continue to loop like this until IsTruncated is false.
See this Amazon doc for more info: Iterating Through Multi-Page Results
Old thread, but still relevant as I was looking for the answer until I just figured this out. I wanted a file count using a GUI-based tool (i.e. no code). I happen to already use a tool called 3Hub for drag & drop transfers to and from S3. I wanted to know how many files I had in a particular bucket (I don't think billing breaks it down by buckets).
So, using 3Hub,
- list the contents of the bucket (looks basically like a finder or explorer window)
- go to the bottom of the list, click 'show all'
- select all (ctrl+a)
- choose copy URLs from right-click menu
- paste the list into a text file (I use TextWrangler for Mac)
- look at the line count
I had 20521 files in the bucket and did the file count in less than a minute.
I used the python script from scalablelogic.com (adding in the count logging). Worked great.
#!/usr/local/bin/python
import sys
from boto.s3.connection import S3Connection
s3bucket = S3Connection().get_bucket(sys.argv[1])
size = 0
totalCount = 0
for key in s3bucket.list():
totalCount += 1
size += key.size
print 'total size:'
print "%.3f GB" % (size*1.0/1024/1024/1024)
print 'total count:'
print totalCount
You can just execute this cli command to get the total file count in the bucket or a specific folder
Scan whole bucket
aws s3api list-objects-v2 --bucket testbucket | grep "Key" | wc -l
aws s3api list-objects-v2 --bucket BUCKET_NAME | grep "Key" | wc -l
you can use this command to get in details
aws s3api list-objects-v2 --bucket BUCKET_NAME
Scan a specific folder
aws s3api list-objects-v2 --bucket testbucket --prefix testfolder --start-after testfolder/ | grep "Key" | wc -l
aws s3api list-objects-v2 --bucket BUCKET_NAME --prefix FOLDER_NAME --start-after FOLDER_NAME/ | grep "Key" | wc -l
Here's the boto3 version of the python script embedded above.
import sys
import boto3
s3 = boto3.resource('s3')
s3bucket = s3.Bucket(sys.argv[1])
size = 0
totalCount = 0
for key in s3bucket.objects.all():
totalCount += 1
size += key.size
print('total size:')
print("%.3f GB" % (size*1.0/1024/1024/1024))
print('total count:')
print(totalCount)`
aws s3 ls s3://bucket-name/folder-prefix-if-any --recursive | wc -l
Select the bucket/Folder-> Click on actions -> Click on Calculate Total Size
You can download and install s3 browser from http://s3browser.com/. When you select a bucket in the center right corner you can see the number of files in the bucket. But, the size it shows is incorrect in the current version.
Gubs
You can potentially use Amazon S3 inventory that will give you list of objects in a csv file
If you're looking for specific files, let's say .jpg
images, you can do the following:
aws s3 ls s3://your_bucket | grep jpg | wc -l
Following is how you can do it using java client.
<dependency>
<groupId>com.amazonaws</groupId>
<artifactId>aws-java-sdk-s3</artifactId>
<version>1.11.519</version>
</dependency>
import com.amazonaws.ClientConfiguration;
import com.amazonaws.Protocol;
import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.ObjectListing;
public class AmazonS3Service {
private static final String S3_ACCESS_KEY_ID = "ACCESS_KEY";
private static final String S3_SECRET_KEY = "SECRET_KEY";
private static final String S3_ENDPOINT = "S3_URL";
private AmazonS3 amazonS3;
public AmazonS3Service() {
ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProtocol(Protocol.HTTPS);
clientConfiguration.setSignerOverride("S3SignerType");
BasicAWSCredentials credentials = new BasicAWSCredentials(S3_ACCESS_KEY_ID, S3_SECRET_KEY);
AWSStaticCredentialsProvider credentialsProvider = new AWSStaticCredentialsProvider(credentials);
AmazonS3ClientBuilder.EndpointConfiguration endpointConfiguration = new AmazonS3ClientBuilder.EndpointConfiguration(S3_ENDPOINT, null);
amazonS3 = AmazonS3ClientBuilder.standard().withCredentials(credentialsProvider).withClientConfiguration(clientConfiguration)
.withPathStyleAccessEnabled(true).withEndpointConfiguration(endpointConfiguration).build();
}
public int countObjects(String bucketName) {
int count = 0;
ObjectListing objectListing = amazonS3.listObjects(bucketName);
int currentBatchCount = objectListing.getObjectSummaries().size();
while (currentBatchCount != 0) {
count += currentBatchCount;
objectListing = amazonS3.listNextBatchOfObjects(objectListing);
currentBatchCount = objectListing.getObjectSummaries().size();
}
return count;
}
}
Success story sharing
aws s3 ls s3://mybucket/mydirectory/ --recursive | wc -l
ls dir | wc -l