{"record":{"id":"3d4c258e3e90c991","repo":"redis/redis","slug":"error-fetching-random-members-n","errorCode":null,"errorMessage":"Error fetching random members\\n","messagePattern":"Error fetching random members\\\\n","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/redis-cli.c","lineNumber":9052,"sourceCode":"    }\n    unsigned int dim = reply->integer;\n    freeReplyObject(reply);\n\n    printf(\"\\n# Testing recall for vector set: %s (dimension: %d)\\n\",\n           config.vset_recall_key, dim);\n    printf(\"# Mixing %d random element vectors, top %d results, EF=%d\\n\\n\",\n           ele_count, vsim_count, vsim_ef);\n\n    signal(SIGINT, longStatLoopModeStop);\n\n    /* Do the same recall test again and again. */\n    while (force_cancel_loop == 0) {\n        /* Get random members. */\n        reply = reconnectingRedisCommand(context, \"VRANDMEMBER %s %d\",\n                                        config.vset_recall_key, ele_count);\n        if (reply == NULL || reply->type != REDIS_REPLY_ARRAY ||\n            reply->elements == 0) {\n            fprintf(stderr, \"Error fetching random members\\n\");\n            exit(1);\n        }\n\n        /* Fetch and store vectors. */\n        double **vectors = zmalloc(reply->elements * sizeof(double*));\n        int valid_vectors = 0;\n\n        for (size_t i = 0; i < reply->elements; i++) {\n            redisReply *vemb = reconnectingRedisCommand(context, \"VEMB %s %s\",\n                                                       config.vset_recall_key,\n                                                       reply->element[i]->str);\n            if (vemb && vemb->type == REDIS_REPLY_ARRAY &&\n                vemb->elements == dim) {\n                vectors[valid_vectors] = zmalloc(dim * sizeof(double));\n                for (unsigned int j = 0; j < dim; j++) {\n                    vectors[valid_vectors][j] = atof(vemb->element[j]->str);\n                }\n                valid_vectors++;","sourceCodeStart":9034,"sourceCodeEnd":9070,"githubUrl":"https://github.com/redis/redis/blob/4f20cb48934463db5970bd476461b2d57af3f38d/src/redis-cli.c#L9034-L9070","documentation":"Inside the recall loop, `VRANDMEMBER <key> <count>` returned NULL, a non-array, or an empty array (redis-cli.c:9050), so the test cannot build query vectors and `exit(1)`s. Causes include a lost connection mid-run, the key being emptied or retyped, or a count larger than available elements.","triggerScenarios":"The vector set was flushed/emptied during the run, count exceeds the set size, or the connection dropped.","commonSituations":"Concurrent writes/deletes on the key, network interruption, or `--vset-recall-ele-count` set higher than the member count.","solutions":["Keep the key populated and stable for the duration of the run.","Lower `--vset-recall-ele-count` to be <= the current member count.","Ensure a stable connection; run on a host with a reliable link to Redis."],"exampleFix":"// before\nredis-cli --vset-recall --vset-recall-key myset --vset-recall-ele-count 1000   # set has 50\n// after\nredis-cli --vset-recall --vset-recall-key myset --vset-recall-ele-count 50","handlingStrategy":"validation","validationCode":"# Ensure the key has enough members for the requested sample count\nmembers=$(redis-cli -h \"$HOST\" -p \"$PORT\" -n \"$DB\" VCARD \"$KEY\" 2>/dev/null)\n[ \"${members:-0}\" -ge \"$ELE_COUNT\" ] || { echo \"not enough members ($members < $ELE_COUNT)\"; exit 2; }\nredis-cli --vset-recall --vset-recall-key \"$KEY\" --vset-recall-ele-count \"$ELE_COUNT\"","typeGuard":null,"tryCatchPattern":"if ! redis-cli --vset-recall --vset-recall-key \"$KEY\" --vset-recall-ele-count \"$N\"; then\n  echo \"recall failed; keep the key populated and ensure N <= member count\" >&2\n  exit 1\nfi","preventionTips":["Set `--vset-recall-ele-count` to <= the current member count.","Avoid concurrent flush/delete on the key during the run.","Keep the connection stable for the duration of the test."],"tags":["cli","vector","network"],"backgroundTag":null,"analyzedSha":"4f20cb48934463db5970bd476461b2d57af3f38d","analyzedAt":"2026-08-10T14:17:07.821Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}