[jira] [Created] (CASSANDRA-14136) MemtableFlushWriter DecoratedKey Exception

["Aditya Bharadwaj (JIRA)" <ji...@apache.org>]

Aditya Bharadwaj created CASSANDRA-14136:
--------------------------------------------

             Summary: MemtableFlushWriter DecoratedKey Exception
                 Key: CASSANDRA-14136
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14136
             Project: Cassandra
          Issue Type: Bug
          Components: Compaction
         Environment: CentOS Linux release 7.3.1611 (Core) , 3 Node cluster with Replication Factor or 2
            Reporter: Aditya Bharadwaj
             Fix For: 3.0.11
         Attachments: debug.log.gz, system.log.gz

Running into this issue on my cluster periodically for different tables. After this error is encountered, all the post flushes stop and eventually the system runs out of memory.
On a restart all the commit logs get played normally and things go back to normal. 

I'm unable to understand the scenario, but the issue is recreating every few days.

bq. {{{quote}DEBUG [MemtableFlushWriter:884] 2017-12-26 18:19:40,883 Memtable.java:401 - Completed flushing /mnt/DATA/cassandra/data/martjack/products_by_hierarchy5storeid_pascdesc-411cabe0632411e7b25a1b665c06298b/.id
bq. x_hierarchy1category/mc-2050-big-Data.db (508.127KiB) for commitlog position ReplayPosition(segmentId=1513929386900,
bq.  position=19110822)
bq. DEBUG [MemtableFlushWriter:884] 2017-12-26 18:19:41,150 Memtable.java:368 - Writing Memtable-products_by_hierarchy5storeid_pascdesc.idx_hierarchy3category@551487729(545.926KiB serialized bytes, 324073 ops, 0%/0% of on/off-heap limit)
bq. ERROR [MemtableFlushWriter:884] 2017-12-26 18:19:41,316 CassandraDaemon.java:205 - Exception in thread Thread[MemtableFlushWriter:884,5,main]
bq. java.lang.RuntimeException: Last written key DecoratedKey(CU00328612, 43553030333238363132) >= current key DecoratedKey(^@^@^@^@^@^@^@^@^@^@, 43553030333238363838) writing into /mnt/DATA/cassandra/data/martjack/products_by_hierarchy5storeid_pascdesc-411cabe0632411e7b25a1b665c06298b/.idx_hierarchy3category/mc-2134-big-Data.db
bq.         at org.apache.cassandra.io.sstable.format.big.BigTableWriter.beforeAppend(BigTableWriter.java:106) ~[apache-cassandra-3.0.9.jar:3.0.9]
bq.         at org.apache.cassandra.io.sstable.format.big.BigTableWriter.append(BigTableWriter.java:145) ~[apache-cassandra-3.0.9.jar:3.0.9]
bq.         at org.apache.cassandra.io.sstable.SimpleSSTableMultiWriter.append(SimpleSSTableMultiWriter.java:45) ~[apache-cassandra-3.0.9.jar:3.0.9]
bq.         at org.apache.cassandra.io.sstable.SSTableTxnWriter.append(SSTableTxnWriter.java:52) ~[apache-cassandra-3.0.9.jar:3.0.9]
bq.         at org.apache.cassandra.db.Memtable.writeSortedContents(Memtable.java:394) ~[apache-cassandra-3.0.9.jar:3.0.9]
bq.         at org.apache.cassandra.db.Memtable.flush(Memtable.java:332) ~[apache-cassandra-3.0.9.jar:3.0.9]
bq.         at org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1054) ~[apache-cassandra-3.0.9.jar:3.0.9]
bq.         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_112]
bq.         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_112]
bq.         at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_112]
bq. {quote}}}



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