[system test] web request failed "/pools/default/buckets/default/localRandomKey"}, {type,error}, {what,badarg},

Cluster information:

• 8 centos 6.2 64bit server with 4 cores CPU
• Each server has 32 GB RAM and 400 GB SSD disk.
• 24.8 GB RAM for couchbase server at each node
• SSD disk format ext4 on /data
• Each server has its own drive, no disk sharing with other server.
• Cluster has 2 buckets, default (12GB) and saslbucket (12GB) and setup cluster with consistent enable.
• Each bucket has one doc and 2 views for each doc (default d1 and saslbucket d11)

• Create cluster with 6 nodes installed couchbase server 2.0.0-1746

10.6.2.37
10.6.2.38
10.6.2.39
10.6.2.40
10.6.2.42
10.6.2.43

• Load 28 million items to both bucket. Each key has size from 512 bytes to 1500 bytes

Add 2 nodes 10.6.2.44, 10.6.2.45 and remove 2 node 10.6.2.40, 10.6.2.43
Rebalance. Rebalance seems very slow. After 10 hours of running rebalance, I stop rebalance.
Restart rebalance again. Rebalance failed. Filed bug MB-6745

Look at log page, I see a lot of error

Server error during processing: ["web request failed",

{path, "/pools/default/buckets/default/localRandomKey"}

,

{type,error}

,

{what,badarg}

,
{trace,
[{dict,fetch,
['ns_1@10.6.2.44',
{dict,6,16,16,8,80,48,

{[],[],[],[],[],[],[],[],[],[],[],[],[], [],[],[]}

,
{{[['ns_1@10.6.2.40',513,514,515,516,
517,518,519,520,521,522,523,524,525,
526,527,528,529,530,531,532,533,534,
535,536,537,538,539,540,541,542,543,
544,545,546,547,548,549,550,551,552,
553,554,555,556,557,558,559,560,561,
562,563,564,565,566,567,568,569,570,
571,572,573,574,575,576,577,578,579,
580,581,582,583,584,585,586,587,588,
589,590,591,592,593,594,595,596,597,
598,599,600,601,602,603,604,605,606,
607,608,609,610,611,612,613,614,615,
616,617,618,619,620,621,622,623,624,
625,626,627,628,629,630,631,632,633,
634,635,636,637,638,639,640,641,642,
643,644,645,646,647,648,649,650,651,
652,653,654,655,656,657,658,659,660,
661,662,663,664,665,666,667,668,669,
670,671,672,673,674,675,676,677,678,
679,680,681,682,683]],
[],
[['ns_1@10.6.2.42',684,685,686,687,
688,689,690,691,692,693,694,695,696,
697,698,699,700,701,702,703,704,705,
706,707,708,709,710,711,712,713,714,
715,716,717,718,719,720,721,722,723,
724,725,726,727,728,729,730,731,732,
733,734,735,736,737,738,739,740,741,
742,743,744,745,746,747,748,749,750,
751,752,753,754,755,756,757,758,759,
760,761,762,763,764,765,766,767,768,
769,770,771,772,773,774,775,776,777,
778,779,780,781,782,783,784,785,786,
787,788,789,790,791,792,793,794,795,
796,797,798,799,800,801,802,803,804,
805,806,807,808,809,810,811,812,813,
814,815,816,817,818,819,820,821,822,
823,824,825,826,827,828,829,830,831,
832,833,834,835,836,837,838,839,840,
841,842,843,844,845,846,847,848,849,
850,851,852,853]],
[['ns_1@10.6.2.43',854,855,856,857,
858,859,860,861,862,863,864,865,866,
867,868,869,870,871,872,873,874,875,
876,877,878,879,880,881,882,883,884,
885,886,887,888,889,890,891,892,893,
894,895,896,897,898,899,900,901,902,
903,904,905,906,907,908,909,910,911,
912,913,914,915,916,917,918,919,920,
921,922,923,924,925,926,927,928,929,
930,931,932,933,934,935,936,937,938,
939,940,941,942,943,944,945,946,947,
948,949,950,951,952,953,954,955,956,
957,958,959,960,961,962,963,964,965,
966,967,968,969,970,971,972,973,974,
975,976,977,978,979,980,981,982,983,
984,985,986,987,988,989,990,991,992,
993,994,995,996,997,998,999,1000,
1001,1002,1003,1004,1005,1006,1007,
1008,1009,1010,1011,1012,1013,1014,
1015,1016,1017,1018,1019,1020,1021,
1022,1023]],
[],[],[],
[['ns_1@10.6.2.37',0,1,2,3,4,5,6,7,8,
9,10,11,12,13,14,15,16,17,18,19,20,
21,22,23,24,25,26,27,28,29,30,31,32,
33,34,35,36,37,38,39,40,41,42,43,44,
45,46,47,48,49,50,51,52,53,54,55,56,
57,58,59,60,61,62,63,64,65,66,67,68,
69,70,71,72,73,74,75,76,77,78,79,80,
81,82,83,84,85,86,87,88,89,90,91,92,
93,94,95,96,97,98,99,100,101,102,
103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,
121,122,123,124,125,126,127,128,129,
130,131,132,133,134,135,136,137,138,
139,140,141,142,143,144,145,146,147,
148,149,150,151,152,153,154,155,156,
157,158,159,160,161,162,163,164,165,
166,167,168,169,170]],
[['ns_1@10.6.2.38',171,172,173,174,
175,176,177,178,179,180,181,182,183,
184,185,186,187,188,189,190,191,192,
193,194,195,196,197,198,199,200,201,
202,203,204,205,206,207,208,209,210,
211,212,213,214,215,216,217,218,219,
220,221,222,223,224,225,226,227,228,
229,230,231,232,233,234,235,236,237,
238,239,240,241,242,243,244,245,246,
247,248,249,250,251,252,253,254,255,
256,257,258,259,260,261,262,263,264,
265,266,267,268,269,270,271,272,273,
274,275,276,277,278,279,280,281,282,
283,284,285,286,287,288,289,290,291,
292,293,294,295,296,297,298,299,300,
301,302,303,304,305,306,307,308,309,
310,311,312,313,314,315,316,317,318,
319,320,321,322,323,324,325,326,327,
328,329,330,331,332,333,334,335,336,
337,338,339,340,341]],
[['ns_1@10.6.2.39',342,343,344,345,
346,347,348,349,350,351,352,353,354,
355,356,357,358,359,360,361,362,363,
364,365,366,367,368,369,370,371,372,
373,374,375,376,377,378,379,380,381,
382,383,384,385,386,387,388,389,390,
391,392,393,394,395,396,397,398,399,
400,401,402,403,404,405,406,407,408,
409,410,411,412,413,414,415,416,417,
418,419,420,421,422,423,424,425,426,
427,428,429,430,431,432,433,434,435,
436,437,438,439,440,441,442,443,444,
445,446,447,448,449,450,451,452,453,
454,455,456,457,458,459,460,461,462,
463,464,465,466,467,468,469,470,471,
472,473,474,475,476,477,478,479,480,
481,482,483,484,485,486,487,488,489,
490,491,492,493,494,495,496,497,498,
499,500,501,502,503,504,505,506,507,
508,509,510,511,512]],
[],[],[],[],[],[]}}}]},

{menelaus_web_buckets, handle_local_random_key,3}

,

{menelaus_web_buckets, checking_bucket_access,4}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

,

{proc_lib,init_p_do_apply,3}

]}]

Link to collect info of all nodes https://s3.amazonaws.com/packages.couchbase/collect_info/orange/2_0_0/201209/8nodes-col-info-1746-web-req-failed-err-badarg-20120926-135121.tgz