why it happened? from the code, it looks like this condition is not null https://github.com/apache/cassandra/blob/cassandra-2.1.3/src/java/org/apache/cassandra/io/sstable/SSTableReader.java#L921
or you can quickly fix this by upgrading to 2.1.5, i noticed there is code change for this class https://github.com/apache/cassandra/blob/cassandra-2.1.5/src/java/org/apache/cassandra/io/sstable/SSTableReader.java#L921 hth jason On Fri, May 29, 2015 at 9:39 AM, 曹志富 <cao.zh...@gmail.com> wrote: > I have a 25 noedes C* cluster with C* 2.1.3. These days a node occur split > brain many times。 > > check the log I found this: > > INFO [MemtableFlushWriter:118] 2015-05-29 08:07:39,176 > Memtable.java:378 - Completed flushing > /home/ant/apache-cassandra-2.1.3/bin/../data/data/system/sstable_activity-5a1ff2 > 67ace03f128563cfae6103c65e/system-sstable_activity-ka-4371-Data.db (8187 > bytes) for commitlog position ReplayPosition(segmentId=1432775133526, > position=16684949) > ERROR [IndexSummaryManager:1] 2015-05-29 08:10:30,209 > CassandraDaemon.java:167 - Exception in thread > Thread[IndexSummaryManager:1,1,main] > java.lang.AssertionError: null > at > org.apache.cassandra.io.sstable.SSTableReader.cloneWithNewSummarySamplingLevel(SSTableReader.java:921) > ~[apache-cassandra-2.1.3.jar:2.1.3] > at > org.apache.cassandra.io.sstable.IndexSummaryManager.adjustSamplingLevels(IndexSummaryManager.java:410) > ~[apache-cassandra-2.1.3.jar:2.1.3] > at > org.apache.cassandra.io.sstable.IndexSummaryManager.redistributeSummaries(IndexSummaryManager.java:288) > ~[apache-cassandra-2.1.3.jar:2.1.3] > at > org.apache.cassandra.io.sstable.IndexSummaryManager.redistributeSummaries(IndexSummaryManager.java:238) > ~[apache-cassandra-2.1.3.jar:2.1.3] > at > org.apache.cassandra.io.sstable.IndexSummaryManager$1.runMayThrow(IndexSummaryManager.java:139) > ~[apache-cassandra-2.1.3.jar:2.1.3] > at > org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) > ~[apache-cassandra-2.1.3.jar:2.1.3] > at > org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor$UncomplainingRunnable.run(DebuggableScheduledThreadPoolExecutor.java:82) > ~[apache-cassandra-2. > 1.3.jar:2.1.3] > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) > [na:1.7.0_71] > at > java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304) > [na:1.7.0_71] > at > java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178) > [na:1.7.0_71] > at > java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) > [na:1.7.0_71] > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > [na:1.7.0_71] > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > [na:1.7.0_71] > at java.lang.Thread.run(Thread.java:745) [na:1.7.0_71] > > I want to know why this and how to fix this > > Thanks all > -------------------------------------- > Ranger Tsao >
