# Java client exception : Error Code 22: Operation not allowed at this time **URL:** \ **Category:** Java Client\ **Tags:** java\ **Created:** [July 27, 2021, 10:11am UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667 "2021-07-27T10:11:19Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![wenbozhang](https://avatars.discourse-cdn.com/v4/letter/w/f1d935/32.png) [@wenbozhang](https://discuss.aerospike.com/u/wenbozhang)\ **Post date:** [July 27, 2021, 10:11am UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667/1 "2021-07-27T10:11:19Z")
When I write to aerospike, the following exception occurs on the client : ```auto 2021-07-21 01:50:45.699 ERROR 1353572 --- [asclient thread:69] com.aerospike.client.AerospikeClient : Error Code 22: Operation not allowed at this time com.aerospike.client.AerospikeException: Error Code 22: Operation not allowed at this time at com.aerospike.client.command.WriteCommand.parseResult(WriteCommand.java:54) at com.aerospike.client.command.SyncCommand.execute(SyncCommand.java:84) at com.aerospike.client.AerospikeClient.put(AerospikeClient.java:378) at cn.zwb.asclient.service.impl.AerospikeServiceImpl.set(AerospikeServiceImpl.java:53) at cn.zwb.asclient.task.BaseTask.dealLine(BaseTask.java:999) at cn.zwb.asclient.task.BaseTask.lambda$null$7(BaseTask.java:631) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) ``` - aerospike server verison : aerospike-server-community-4.3.1.4-el7 - aerospike client version : 4.1.11 The following is aeropike’s log : ```auto Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:172) NODE-ID bb9f3962c3e1600 CLUSTER-SIZE 5 Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:250) cluster-clock: skew-ms 3 Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:277) system-memory: free-kbytes 6725840 free-pct 42 heap-kbytes (6710588,6715200,7159808) heap-efficiency-pct 93.7 Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:290) in-progress: tsvc-q 0 info-q 0 nsup-delete-q 0 rw-hash 0 proxy-hash 0 tree-gc-q 0 Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:311) fds: proto (22,4008,3986) heartbeat (4,12,8) fabric (96,144,48) Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:319) heartbeat-received: self 2 foreign 75411753 Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:349) fabric-bytes-per-second: bulk (0,0) ctrl (0,0) meta (0,0) rw (0,0) Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:401) {ns1} objects: all 94290706 master 49544360 prole 44746346 non-replica 0 Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:459) {ns1} migrations: complete Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:486) {ns1} memory-usage: total-bytes 6034605184 index-bytes 6034605184 sindex-bytes 0 used-pct 70.25 Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:547) {ns1} device-usage: used-bytes 10520484288 avail-pct 76 cache-read-pct 0.00 Jul 21 2021 01:50:31 GMT: INFO (info): (ticker.c:597) {ns1} client: tsvc (0,0) proxy (0,0,0) read (205135362,0,0,43190453) write (303781801,9,0) delete (56,0,0,0) udf (0,0,0) lang (0,0,0,0) Jul 21 2021 01:50:31 GMT: INFO (info): (hist.c:240) histogram dump: {ns1}-read (248325815 total) msec Jul 21 2021 01:50:31 GMT: INFO (info): (hist.c:257) (00: 0248246637) (01: 0000025544) (02: 0000027538) (03: 0000025595) Jul 21 2021 01:50:31 GMT: INFO (info): (hist.c:266) (04: 0000000449) (05: 0000000026) (06: 0000000026) Jul 21 2021 01:50:31 GMT: INFO (info): (hist.c:240) histogram dump: {ns1}-write (303781810 total) msec Jul 21 2021 01:50:31 GMT: INFO (info): (hist.c:257) (00: 0303106988) (01: 0000139711) (02: 0000140312) (03: 0000110789) Jul 21 2021 01:50:31 GMT: INFO (info): (hist.c:257) (04: 0000048592) (05: 0000068252) (06: 0000073380) (07: 0000093534) Jul 21 2021 01:50:31 GMT: INFO (info): (hist.c:266) (08: 0000000252) ``` I looked at this [page](https://docs.aerospike.com/docs/dev_reference/error_codes.html), but it didn’t match any of them. ---
**Author:** ![Brian](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/brian/32/2211_2.png) [@Brian](https://discuss.aerospike.com/u/Brian)\ **Post date:** [July 27, 2021, 4:16pm UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667/2 "2021-07-27T16:16:56Z")
See: [Client writes fail with AEROSPIKE\_ERR\_FAIL\_FORBIDDEN](https://discuss.aerospike.com/t/client-writes-fail-with-aerospike-err-fail-forbidden/2785) ---
**Author:** ![wenbozhang](https://avatars.discourse-cdn.com/v4/letter/w/f1d935/32.png) [@wenbozhang](https://discuss.aerospike.com/u/wenbozhang)\ **Post date:** [July 28, 2021, 2:43am UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667/3 "2021-07-28T02:43:22Z")
Hi Brain, thank you for your help. I read the content on this page, but I didn’t find anything that fits my problem: - I can confirm that namespace / set is not during truncate / delete - In the aeropike log, you can see that - I’m doing a write operation. Will the limitation of scan parameters affect the writing? - I am using the community edition and have no XDR and SC feature. - I set the default-ttl to 180d and the nsup-period to the default value of 120 In conclusion, I don’t know why `Error code 22` appears on the Java client. ---
**Author:** ![meher](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/meher/32/1644_2.png) [@meher](https://discuss.aerospike.com/u/meher)\ **Post date:** [July 28, 2021, 5:25pm UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667/4 "2021-07-28T17:25:28Z")
Did you check for any warnings across the whole log file on all server nodes? ---
**Author:** ![wenbozhang](https://avatars.discourse-cdn.com/v4/letter/w/f1d935/32.png) [@wenbozhang](https://discuss.aerospike.com/u/wenbozhang)\ **Post date:** [July 29, 2021, 4:27am UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667/5 "2021-07-29T04:27:00Z")
Yes, there are five nodes in my aerospike cluster, and all their logs are similar to the following : ```auto Jul 21 2021 01:01:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6032767488 (6032767488 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10540098128 hwm:26843545600 Jul 21 2021 01:01:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716748 - threshold bucket 742, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:03:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6029930240 (6029930240 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10533614400 hwm:26843545600 Jul 21 2021 01:03:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716868 - threshold bucket 742, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:05:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:05:58 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716730 - threshold bucket 741, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:07:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:07:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716850 - threshold bucket 741, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:09:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:09:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716712 - threshold bucket 740, width 258 sec, count 1362314 > target 216966 (0.5 pct) Jul 21 2021 01:11:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:11:58 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716832 - threshold bucket 740, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:13:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:13:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716694 - threshold bucket 739, width 258 sec, count 846739 > target 216966 (0.5 pct) Jul 21 2021 01:15:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:15:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716814 - threshold bucket 739, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:17:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:17:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716676 - threshold bucket 738, width 258 sec, count 343573 > target 216966 (0.5 pct) Jul 21 2021 01:19:51 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:19:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716795 - threshold bucket 738, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:21:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:21:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716916 - threshold bucket 738, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:23:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:23:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716778 - threshold bucket 737, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:25:51 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:25:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716897 - threshold bucket 737, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:27:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:27:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716760 - threshold bucket 736, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:29:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:29:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716880 - threshold bucket 736, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:31:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:31:58 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716742 - threshold bucket 735, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:33:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:33:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716862 - threshold bucket 735, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:35:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:35:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716724 - threshold bucket 734, width 258 sec, count 1695050 > target 216966 (0.5 pct) Jul 21 2021 01:37:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:37:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716844 - threshold bucket 734, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:39:51 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:39:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716705 - threshold bucket 733, width 258 sec, count 1160568 > target 216966 (0.5 pct) Jul 21 2021 01:41:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6028426368 (6028426368 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10531722608 hwm:26843545600 Jul 21 2021 01:41:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716826 - threshold bucket 733, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:43:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6024230720 (6024230720 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10526463936 hwm:26843545600 Jul 21 2021 01:43:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716688 - threshold bucket 732, width 258 sec, count 673496 > target 216966 (0.5 pct) Jul 21 2021 01:45:51 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6023410624 (6023410624 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10525434816 hwm:26843545600 Jul 21 2021 01:45:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716807 - threshold bucket 732, width 258 sec, count 1874659 > target 216966 (0.5 pct) Jul 21 2021 01:47:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6023410624 (6023410624 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10525434816 hwm:26843545600 Jul 21 2021 01:49:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6012581120 (6012581120 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10511840160 hwm:26843545600 Jul 21 2021 01:49:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716790 - threshold bucket 731, width 258 sec, count 1705448 > target 216120 (0.5 pct) Jul 21 2021 01:51:51 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6012581120 (6012581120 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10511840160 hwm:26843545600 Jul 21 2021 01:51:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716909 - threshold bucket 731, width 258 sec, count 1705448 > target 216120 (0.5 pct) Jul 21 2021 01:53:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6012581120 (6012581120 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10511840160 hwm:26843545600 Jul 21 2021 01:53:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716772 - threshold bucket 730, width 258 sec, count 1705448 > target 216120 (0.5 pct) Jul 21 2021 01:55:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6012581120 (6012581120 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10511840160 hwm:26843545600 Jul 21 2021 01:55:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716892 - threshold bucket 730, width 258 sec, count 1705448 > target 216120 (0.5 pct) Jul 21 2021 01:57:52 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6012581120 (6012581120 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10511840160 hwm:26843545600 Jul 21 2021 01:57:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716754 - threshold bucket 729, width 258 sec, count 1705448 > target 216120 (0.5 pct) Jul 21 2021 01:59:51 GMT: WARNING (nsup): (thr_nsup.c:1265) {ns1} breached eviction hwm (memory), memory sz:6010642688 (6010642688 + 0 + 0) hwm:5153960755, index-device sz:0 hwm:0, disk sz:10507403232 hwm:26843545600 Jul 21 2021 01:59:57 GMT: WARNING (nsup): (thr_nsup.c:814) {ns1} no records below eviction void-time 364716873 - threshold bucket 729, width 258 sec, count 1705448 > target 216120 (0.5 pct) ``` ---
**Author:** ![meher](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/meher/32/1644_2.png) [@meher](https://discuss.aerospike.com/u/meher)\ **Post date:** [July 31, 2021, 1:24am UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667/6 "2021-07-31T01:24:52Z")
Those warnings are about breaching the high water mark threshold for memory and not finding anything to evict. Those shouldn’t cause any error 22. But, from your previous log excerpt: `write (303781801,9,0)` it seems you had 9 errors on this node out of ~300M writes, assuming all 9 are error 22. So it seems to happen fairly infrequently and could be based on some very transient situation where a node breaches stop writes (wild guess). Looking at the logs when the counter for the error increases may help… ---
**Author:** ![wenbozhang](https://avatars.discourse-cdn.com/v4/letter/w/f1d935/32.png) [@wenbozhang](https://discuss.aerospike.com/u/wenbozhang)\ **Post date:** [August 3, 2021, 1:20am UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667/7 "2021-08-03T01:20:24Z")
Thank you for your help, Meher. At present, my method is to try to write again on the Java client when an exception occurs. But I still don’t know why this exception is triggered. It only appears occasionally when writing. The usage of all nodes in my aerospike cluster (`memory used-pct 70, device avail-pct 70`), which should not trigger stop writes. And I think if stop writes is triggered, I should see the corresponding warning log in the log, but I don’t see it in the log of any node. ---
**Author:** ![meher](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.aerospike.com/meher/32/1644_2.png) [@meher](https://discuss.aerospike.com/u/meher)\ **Post date:** [August 3, 2021, 1:57am UTC](https://discuss.aerospike.com/t/java-client-exception-error-code-22-operation-not-allowed-at-this-time/8667/8 "2021-08-03T01:57:58Z")
Yes, you are correct. Would still be interesting to see the logs when the counter increments to check if anything suspicious that could explain it.