https://issues.apache.org/jira/plugins/servlet/mobile#issue/CASSANDRA-11995
-- Jeff Jirsa > On Sep 19, 2017, at 4:36 PM, Dikang Gu <dikan...@gmail.com> wrote: > > Hello, > > In our production cluster, we had multiple times that after a *unclean* > shutdown, cassandra sever can not start due to commit log exceptions: > > 2017-09-17_06:06:32.49830 ERROR 06:06:32 [main]: Exiting due to error while > processing commit log during initialization. > 2017-09-17_06:06:32.49831 > org.apache.cassandra.db.commitlog.CommitLogReplayer$CommitLogReplayException: > Could not read commit log descriptor in file > /data/cassandra/commitlog/CommitLog-5-1503088780367.log > 2017-09-17_06:06:32.49831 at > org.apache.cassandra.db.commitlog.CommitLogReplayer.handleReplayError(CommitLogReplayer.java:634) > [apache-cassandra-2.2.5+git20170612.e1857fa.jar:2.2.5+git20170612.e1857fa] > 2017-09-17_06:06:32.49831 at > org.apache.cassandra.db.commitlog.CommitLogReplayer.recover(CommitLogReplayer.java:303) > [apache-cassandra-2.2.5+git20170612.e1857fa.jar:2.2.5+git20170612.e1857fa] > 2017-09-17_06:06:32.49831 at > org.apache.cassandra.db.commitlog.CommitLogReplayer.recover(CommitLogReplayer.java:147) > [apache-cassandra-2.2.5+git20170612.e1857fa.jar:2.2.5+git20170612.e1857fa] > 2017-09-17_06:06:32.49832 at > org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:189) > [apache-cassandra-2.2.5+git20170612.e1857fa.jar:2.2.5+git20170612.e1857fa] > 2017-09-17_06:06:32.49832 at > org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:169) > [apache-cassandra-2.2.5+git20170612.e1857fa.jar:2.2.5+git20170612.e1857fa] > 2017-09-17_06:06:32.49832 at > org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:302) > [apache-cassandra-2.2.5+git20170612.e1857fa.jar:2.2.5+git20170612.e1857fa] > 2017-09-17_06:06:32.49832 at > org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:544) > [apache-cassandra-2.2.5+git20170612.e1857fa.jar:2.2.5+git20170612.e1857fa] > 2017-09-17_06:06:32.49832 at > org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:607) > [apache-cassandra-2.2.5+git20170612.e1857fa.jar:2.2.5+git20170612.e1857fa] > > I add some logging to the CommitLogDescriptor.readHeader(), and find the > header is empty in the failure case. By empty, I mean all the fields in the > header are 0: > > 2017-09-19_22:43:02.22112 INFO 22:43:02 [main]: Dikang: crc: 0, checkcrc: > 2077607535 > 2017-09-19_22:43:02.22130 INFO 22:43:02 [main]: Dikang: version: 0, id: 0, > parametersLength: 0 > > As a result, it did not pass the crc check, and failed the commit log > replay. > > My question is: is it a known issue that some race condition can cause > empty header in commit log? If so, it should be safe just skip last commit > log with empty header, right? > > As you can see, we are using Cassandra 2.2.5. > > Thanks > Dikang.
