Hello, We faced an issue that https://docs.ceph.com/en/latest/rados/api/librados/#c.rados_nobjects_list_ge... always returns 0 for our pools. Ceph version is *16.2.15* Scenario is: #include <rados/librados.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #define POOL_NAME "TODO" // Change this to your pool name int main(int argc, const char **argv) { rados_t cluster; char cluster_name[] = "ceph"; char user_name[] = ""; uint64_t flags = 0; int ret; // Initialize the cluster handle ret = rados_create(&cluster, NULL); if (ret < 0) { fprintf(stderr, "Couldn't initialize the cluster handle! error %d\n", ret); exit(EXIT_FAILURE); } fprintf(stdout, "cluster: %p\n", cluster); // Read the Ceph configuration file ret = rados_conf_read_file(cluster, "/etc/ceph/ceph.conf"); if (ret < 0) { fprintf(stderr, "Cannot read config file: %d\n", ret); exit(EXIT_FAILURE); } fprintf(stdout, "read conf: %d\n", ret); // Connect to the cluster ret = rados_connect(cluster); if (ret < 0) { fprintf(stderr, "Cannot connect to cluster: %d\n", ret); exit(EXIT_FAILURE); } // Open the pool rados_ioctx_t io_ctx; ret = rados_ioctx_create(cluster, POOL_NAME, &io_ctx); if (ret < 0) { fprintf(stderr, "Cannot open pool %s: %d\n", POOL_NAME, ret); exit(EXIT_FAILURE); } // Create an iterator for all objects in the pool rados_list_ctx_t list_ctx; ret = rados_nobjects_list_open(io_ctx, &list_ctx); if (ret < 0) { fprintf(stderr, "Cannot list objects: %d\n", ret); rados_ioctx_destroy(io_ctx); exit(EXIT_FAILURE); } printf("Objects in pool '%s':\n", POOL_NAME); printf("--------------------------------\n"); // Iterate through all objects const char *entry; const char *key; const char *ns; while (rados_nobjects_list_next(list_ctx, &entry, &key, &ns) == 0) { printf("%s\n", entry); printf("ns: %s\n", ns); printf("key: %s\n", key); printf("hash: %d\n", rados_nobjects_list_get_pg_hash_position(list_ctx)); // here we're getting 0 for all objects/pools } // Clean up rados_nobjects_list_close(list_ctx); rados_ioctx_destroy(io_ctx); return 0; } By my investigation, I found if I use get/seek cursor and after that call rados_nobjects_list_get_pg_hash_position then it returns the corrct hash position. *Questions:* 1. Could you please have a look and provide thoughts on why we're getting 0 values in the code? 2. Can it be related to our osd configuraiton like sortbitwise or something else? 3. I found in the code that this hash position is moving only on seeking. Is it bug? 4. Can we add some new C API like *rados_nobjects_list_get_cursor_hash_position* for getting the hash from the cursor handle (since the cursor handle is actually an hobject, we can simply return get_hash() based on the passed cursor for this API)? -- Best Regards, Denis Tingaikin