# Logstash freezes post update to 6.2.4 **URL:** \ **Category:** Logstash\ **Created:** [April 19, 2018, 10:43am UTC](https://discuss.elastic.co/t/logstash-freezes-post-update-to-6-2-4/128675 "2018-04-19T10:43:22Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![PandKing](https://avatars.discourse-cdn.com/v4/letter/p/258eb7/32.png) [@PandKing](https://discuss.elastic.co/u/PandKing)\ **Post date:** [April 25, 2018, 1:28am UTC](https://discuss.elastic.co/t/logstash-freezes-post-update-to-6-2-4/128675/2 "2018-04-25T01:28:21Z")
Same here. > [@Logstash-6.2.4-1 persisted queue hung again](https://discuss.elastic.co/t/logstash-6-2-4-1-persisted-queue-hung-again/129374): > > Spent a couple hours looking through the forum. Lots of people talking about persisted queues not processing but have not seen any solutions to troubleshoot. This seems to be a single file that needs to be looked at 55940 How can I fix that file and process the rest ? [2018-04-24T17:34:03,691][DEBUG][org.logstash.ackedqueue.Queue] opening tail page: 55938, in: /opt/logstash/queue/main, with checkpoint: pageNum=55938, firstUnackedPageNum=0, firstUnackedSeqNum=1321359026, minSeqNum=1321359026, e… All ugly after this. Apr 24 22:24:00 ent-mocsmlh04 systemd: Starting logstash... Apr 24 22:24:22 ent-mocsmlh04 logstash: Sending Logstash's logs to /var/log/logstash which is now configured via log4j2.properties Apr 24 22:25:22 ent-mocsmlh04 logstash: Exception in thread "Ruby-0-Thread-9@[main]\>worker0: /usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:385" org.logstash.ackedqueue.QueueRuntimeException: deserialize invocation error Apr 24 22:25:22 ent-mocsmlh04 logstash: at org.logstash.ackedqueue.Queue.deserialize(Queue.java:733) Apr 24 22:25:22 ent-mocsmlh04 logstash: at org.logstash.ackedqueue.Batch.deserializeElements(Batch.java:62) --- _[View the full topic](https://discuss.elastic.co/t/logstash-freezes-post-update-to-6-2-4/128675)._