I think this could be fixed by ListObjectV2.
On Mon, Mar 9, 2020 at 4:39 PM Daniel Gryniewicz <dgryniew@xxxxxxxxxx> wrote:
Certainly if you turn the RGW logging up to 20, you can see just about
everything that it does. It should be possible to see the reason, but
of course there will be a lot of output in the logs.
Daniel
On 3/9/20 8:24 AM, rajiv chodisetti wrote:
> 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 = ""> > MaxKeys=10, Marker=marker)
> else:
> data = "" 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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