Error downloading metadata

[BobHelm]

I have tried (twice) to download metadata for 700 books this morning & both attempts have failed. The first after 40 minutes, the second after 50 minutes.
This is the output

calibre, version 7.17.0 (linux, embedded-python: True)
Failed to download metadata: Failed: Download metadata for 700 books

Starting job: Download metadata for 700 books
Job: "Download metadata for 700 books" failed with error:
Traceback (most recent call last):
File "calibre/gui2/threaded_jobs.py", line 85, in start_work
File "calibre/gui2/metadata/bulk_download.py", line 250, in download
File "calibre/utils/ipc/simple_worker.py", line 255, in fork_job
File "calibre/utils/ipc/simple_worker.py", line 180, in run_job
File "calibre/utils/ipc/simple_worker.py", line 104, in communicate
calibre.utils.ipc.simple_worker.WorkerError: Worker appears to have hung

Called with args: ([134359, 134382, 134355, 134808, 134473, 134442, 134376, 134702, 134572, 134347, 134727, 134306, 134840, 134830, 134654, 134609, 134233, 134501, 134170, 134240, 134166, 134819, 134169, 134148, 134280, 134156, 134236, 134731, 134640, 134639, 134356, 134608, 134493, 134426, 134477, 134207, 134291, 134073, 134303, 134188, 134759, 134658, 134778, 134756, 134750, 134350, 134469, 134269, 134249, 134245, 134247, 134250, 134248, 134243, 134260, 134265, 134264, 134263, 134262, 134261, 134259, 134847, 134423, 134653, 134275, 134435, 134378, 134422, 134386, 134388, 134389, 134178, 134203, 134104, 134151, 134370, 134842, 134238, 134126, 134434, 134507, 134843, 134583, 134351, 134618, 134762, 134139, 134258, 134257, 134211, 134661, 134786, 134649, 134811, 134687, 134721, 134300, 134503, 134613, 134114, 134241, 134235, 134755, 134515, 134745, 134292, 134804, 134513, 134346, 134472, 134833, 134747, 134651, 134372, 134717, 134831, 134231, 134557, 134302, 134471, 134375, 134597, 134311, 134743, 134633, 134304, 134571, 134108, 134491, 134528, 134530, 134455, 134440, 134141, 134446, 134193, 134267, 134730, 134827, 134140, 134729, 134255, 134578, 134385, 134390, 134392, 134313, 134573, 134722, 134486, 134098, 134566, 134832, 134537, 134586, 134694, 134724, 134409, 134683, 134146, 134110, 134256, 134836, 134363, 134358, 134305, 134634, 134693, 134691, 134677, 134097, 134132, 134828, 134497, 134565, 134485, 134648, 134200, 134490, 134508, 134604, 134603, 134154, 134773, 134742, 134822, 134333, 134452, 134555, 134563, 134582, 134569, 134234, 134459, 134407, 134461, 134457, 134458, 134638, 134341, 134195, 134824, 134134, 134517, 134785, 134448, 134445, 134815, 134293, 134138, 134511, 134150, 134774, 134198, 134601, 134560, 134324, 134450, 134623, 134270, 134805, 134839, 134744, 134095, 134516, 134844, 134357, 134838, 134314, 134675, 134719, 134678, 134125, 134124, 134660, 134123, 134592, 134111, 134181, 134147, 134548, 134696, 134266, 134326, 134327, 134449, 134159, 134361, 134364, 134176, 134328, 134492, 134115, 134706, 134751, 134153, 134086, 134631, 134278, 134433, 134070, 134113, 134283, 134761, 134733, 134504, 134294, 134094, 134484, 134316, 134664, 134594, 134771, 134772, 134295, 134526, 134525, 134575, 134489, 134297, 134096, 134093, 134410, 134396, 134184, 134549, 134208, 134588, 134666, 134810, 134512, 134619, 134277, 134179, 134133, 134456, 134109, 134749, 134674, 134610, 134541, 134704, 134700, 134646, 134769, 134600, 134645, 134690, 134353, 134478, 134205, 134561, 134703, 134416, 134192, 134520, 134340, 134252, 134254, 134253, 134379, 134712, 134559, 134439, 134587, 134167, 134348, 134806, 134289, 134552, 134510, 134152, 134570, 134665, 134081, 134091, 134715, 134117, 134368, 134718, 134711, 134339, 134421, 134584, 134509, 134242, 134318, 134483, 134135, 134802, 134074, 134460, 134454, 134479, 134380, 134352, 134628, 134617, 134076, 134468, 134362, 134286, 134606, 134092, 134069, 134616, 134768, 134767, 134212, 134424, 134090, 134201, 134482, 134480, 134079, 134776, 134699, 134758, 134760, 134206, 134301, 134367, 134533, 134237, 134498, 134402, 134118, 134846, 134430, 134467, 134401, 134330, 134408, 134650, 134647, 134103, 134197, 134387, 134780, 134725, 134740, 134144, 134622, 134088, 134692, 134213, 134818, 134558, 134790, 134129, 134400, 134072, 134172, 134425, 134850, 134187, 134545, 134635, 134272, 134398, 134335, 134437, 134331, 134251, 134232, 134562, 134614, 134554, 134812, 134667, 134325, 134697, 134607, 134673, 134714, 134476, 134783, 134338, 134620, 134732, 134377, 134848, 134406, 134431, 134175, 134680, 134524, 134199, 134540, 134685, 134787, 134369, 134656, 134429, 134506, 134505, 134710, 134835, 134107, 134475, 134599, 134686, 134165, 134738, 134488, 134071, 134708, 134757, 134214, 134579, 134577, 134576, 134414, 134413, 134412, 134174, 134323, 134595, 134728, 134602, 134474, 134085, 134641, 134845, 134405, 134268, 134106, 134748, 134546, 134672, 134689, 134543, 134399, 134298, 134080, 134186, 134695, 134659, 134568, 134611, 134384, 134373, 134580, 134466, 134630, 134290, 134371, 134116, 134752, 134841, 134556, 134535, 134271, 134465, 134782, 134707, 134789, 134315, 134709, 134834, 134397, 134632, 134183, 134605, 134337, 134637, 134403, 134428, 134684, 134307, 134536, 134741, 134441, 134453, 134084, 134621, 134101, 134099, 134210, 134121, 134394, 134393, 134395, 134391, 134737, 134246, 134202, 134765, 134522, 134227, 134502, 134299, 134734, 134567, 134496, 134083, 134374, 134136, 134075, 134670, 134168, 134100, 134495, 134671, 134766, 134763, 134829, 134112, 134807, 134321, 134532, 134171, 134089, 134800, 134196, 134276, 134274, 134775, 134309, 134285, 134735, 134443, 134542, 134087, 134182, 134217, 134698, 134736, 134534, 134244, 134336, 134652, 134082, 134564, 134481, 134417, 134821, 134420, 134194, 134663, 134625, 134547, 134281, 134438, 134539, 134180, 134329, 134381, 134544, 134538, 134662, 134655, 134612, 134726, 134754, 134296, 134137, 134494, 134523, 134078, 134319, 134801, 134499, 134158, 134157, 134343, 134284, 134432, 134529, 134334, 134415, 134119, 134470, 134589, 134781, 134676, 134682, 134122, 134317, 134644, 134657, 134701, 134342, 134239, 134574, 134190, 134215, 134837, 134705, 134596, 134279, 134553, 134770, 134273, 134643, 134383, 134366, 134427, 134518, 134723, 134642, 134636, 134764, 134127, 134185, 134803, 134688, 134120, 134160, 134312, 134462, 134102, 134155, 134716, 134713, 134354, 134669, 134308, 134173, 134077, 134164, 134209, 134531, 134436, 134464, 134463, 134105, 134163, 134161, 134162, 134128, 134344, 134131, 134447, 134360, 134365, 134332, 134816, 134418, 134189], '/tmp/calibre_7.17.0_tmp_7xdz889d/1bukdk3g_metadata_bulk.log', <calibre.db.legacy.LibraryDatabase object at 0x7cd6717eb7d0>, True, False, None) {'notifications': <queue.Queue object at 0x7cd6507eb090>, 'abort': <threading.Event at 0x7cd65c441190: unset>, 'log': <calibre.utils.logging.GUILog object at 0x7cd65c442290>}

[kovidgoyal]

That will be your security software killing the calibre worker process because it finds so much network activity suspicious. Trying to download metadata for so many books at once wont work anyway because all the online servers will block/rate limit you.