Any other pointers on how to debug this issue ? Will I be able to find
these kind of issues through logs and if yes where can I find these
logs , I have checked the storage gateway logs and I couldn't find any
useful logs over there
On Sat, Mar 7, 2020 at 9:35 AM rajiv chodisetti
<rajivchodisetti54@xxxxxxxxx <mailto:rajivchodisetti54@xxxxxxxxx>> wrote:
HI Romit,
first of all thanks for your reply,
The Code that I have attached above fetches blobs in the batches
of 1000 because 1000 is what S3 client can fetch at a time.
* The total no of objects in bucket are around 3000 files and
total 2.8 GB in size
* To rule out the possibility of error in my code, I tried various
approaches in both java and as well as python (using boto) and by
increasing client timeout, retry limit, but it's the same
exception everywhere and I tried setting batch sizes to 10, 50,
100, 200,500 and 1000 but every other time listing fails after N
number of iterations, I have pasted the code snippets of various
approaches I have tried below
* I have increased the S3 gateway Pod count to rule out the
possibility of S3 gateway pod being bombaded
* I tried s3cmd recursive approach to get the file count of the
bucket and there also I see errors while listing
Please do let me know if there are any other ways I can check
what's going on at backend
Rajiv.Chodisetti@aakashonprem:~$ s3cmd ls -r s3://my-new-bucket/
--no-ssl --host=${AWS_HOST} --host-bucket= s3://my-new-bucket >
listing.txt
WARNING: Retrying failed request:
/?marker=test-training-akash/du/latest/11340612-0.png.json
WARNING: 500 (UnknownError)
WARNING: Waiting 3 sec...
WARNING: Retrying failed request:
/?marker=test-training-akash/du/latest/11340612-0.png.json
WARNING: 500 (UnknownError)
WARNING: Waiting 6 sec...
^CSee ya!
* Approach 1:*
for (Bucket bucket : s3.listBuckets()) {
System.out.println(" - " + bucket.getName() + " "
+ "(owner = " + bucket.getOwner()
+ " "
+ "(creationDate = " +
bucket.getCreationDate());
ObjectListing objectListing = s3.listObjects(new
ListObjectsRequest()
.withBucketName(bucket.getName()));
do {
for (S3ObjectSummary objectSummary :
objectListing.getObjectSummaries()) {
System.out.println(" --- " +
objectSummary.getKey() + " "
+ "(size = " +
objectSummary.getSize() + ")" + " "
+ "(eTag = " +
objectSummary.getETag() + ")");
}
objectListing =
s3.listNextBatchOfObjects(objectListing);
} while (objectListing.isTruncated());
}
*Approach 2:*
// where i is global variable to keep track of blobs listed so far
// Recursive code to list blobs in Batches of N
private void listDataset(Bucket bucket, AmazonS3 conn, String
nextMarker) {
try {
ListObjectsRequest request = new ListObjectsRequest();
request.setBucketName(bucket.getName());
request.setMaxKeys(200);
if (nextMarker != null && nextMarker.length() > 0) {
request.setMarker(nextMarker);
}
ObjectListing result;
result = conn.listObjects(request);
for (S3ObjectSummary objectSummary :
result.getObjectSummaries()) {
System.out.println(" - " + objectSummary.getKey()
+ " " +
"(size = " + objectSummary.getSize() +
")");
i = i + 1;
}
System.out.println("Total Blobs Fetched So far: " + i);
if (result.getNextMarker() != null) {
System.out.println("Next Object Marker: " +
result.getNextMarker());
nextMarker = result.getNextMarker();
listDataset(bucket, conn, nextMarker);
}
} catch (Exception e) {
e.printStackTrace();
}
}
* Approach 3:*
done = False
marker = None
while not done:
if marker:
data = s3.list_objects(Bucket='my-new-bucket',
MaxKeys=10, Marker=marker)
else:
data = s3.list_objects(Bucket='my-new-bucket', MaxKeys=10)
for key in data['Contents']:
print(key)
if data['IsTruncated']:
marker = data['Contents'][-1]['Key']
else:
done = True
*Approach 4:*
paginator = s3.get_paginator('list_objects')
page_iterator = paginator.paginate(Bucket='my-new-bucket')
for page in page_iterator:
if "Contents" in page:
for key in page["Contents"]:
print(key)
On Sat, Mar 7, 2020 at 7:32 AM Romit Misra
<romit.misra@xxxxxxxxxxxx <mailto:romit.misra@xxxxxxxxxxxx>> wrote:
Some pointers:-
1.What is the approx object count in the bucket...?
2. Use range list,( iterate 1000 objects at a time, and store
the last marker to move to the next list, also referred to as
paginated listing)
3.Check your default timeouts, and optimize tune according to
environment
4.Monitor the system metrics when listing is happening, ( CPU
and memory)
5.Use a alternative client like s3cmd, or Boto rule out the
anamoly if in your code.
Thanks
Romit
On Sat, 7 Mar 2020, 02:34 rajiv chodisetti,
<rajivchodisetti54@xxxxxxxxx
<mailto:rajivchodisetti54@xxxxxxxxx>> wrote:
HI,
I have created an S3 bucket backed by CEPH and through
java S3 client and via S3 object gateway am listing all
the files under the bucket and always the listing is
failing some times after listing 1k+ blobs or some times
after listing 2k+ blobs and am not able to figure out how
to debug this issue
This is the Exception am getting,
|com.amazonaws.services.s3.model.AmazonS3Exception: null
(Service: Amazon S3; Status Code: 500; Error Code:
UnknownError; Request ID:
tx00000000000000000e7df-005e626049-1146-rook-ceph-store;
S3 Extended Request ID:
1146-rook-ceph-store-rook-ceph-store), S3 Extended Request
ID: 1146-rook-ceph-store-rook-ceph-store at
com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleErrorResponse(AmazonHttpClient.java:1799)|
I tried with Boto as well and it's the same error over there,
I have checked the s3 gateway pod logs but I couldn't find
any relevant logs over there, so, please let me know how
do I debug this issue or possible reasons for the same
I have attached the java code am using for reference.
Thanks & Regards,
Rajiv
UIPath
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