Christoph Schnepf created CASSANDRA-20725:
---------------------------------------------
Summary: NullPointerException on opening SSTables
Key: CASSANDRA-20725
URL: https://issues.apache.org/jira/browse/CASSANDRA-20725
Project: Apache Cassandra
Issue Type: Bug
Reporter: Christoph Schnepf
Hi,
we did the update to Cassandra 4.1.9 on a 30-node cluster in a rolling fashion,
however, on 1 node, 1 single SSTable was showing a NullPointerException.
{code:java}
INFO [main] 2025-06-23 10:41:38,576 UTC ColumnFamilyStore.java:484 -
Initializing mykeyspace.MyTWCSTable
INFO [SSTableBatchOpen:2] 2025-06-23 10:41:38,583 UTC
SSTableReaderBuilder.java:354 - Opening
/var/opt/cassandra/mykeyspace/MyTWCSTable-ed2fa920c27411eabe8a17a890aa6eb4/nb-1008071-big
(8.141GiB)
...
... more "Opening" lines
...
INFO [SSTableBatchOpen:32] 2025-06-23 10:41:38,586 UTC
SSTableReaderBuilder.java:354 - Opening
/var/opt/cassandra/mykeyspace/MyTWCSTable-ed2fa920c27411eabe8a17a890aa6eb4/nb-997878-big
(7.357GiB)
ERROR [SSTableBatchOpen:27] 2025-06-23 10:41:38,586 UTC
JVMStabilityInspector.java:68 - Exception in thread
Thread[SSTableBatchOpen:27,5,SSTableBatchOpen]
java.lang.NullPointerException: null
at
org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:510)
at
org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:381)
at
org.apache.cassandra.io.sstable.format.SSTableReader$2.run(SSTableReader.java:551)
at
org.apache.cassandra.concurrent.FutureTask$2.call(FutureTask.java:124)
at org.apache.cassandra.concurrent.FutureTask.call(FutureTask.java:61)
at org.apache.cassandra.concurrent.FutureTask.run(FutureTask.java:71)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Unknown Source)
INFO [SSTableBatchOpen:13] 2025-06-23 10:41:38,594 UTC
SSTableReaderBuilder.java:354 - Opening
/var/opt/cassandra/mykeyspace/MyTWCSTable-ed2fa920c27411eabe8a17a890aa6eb4/nb-1013913-big
(307.642MiB)
INFO [SSTableBatchOpen:27] 2025-06-23 10:41:38,629 UTC
SSTableReaderBuilder.java:354 - Opening
/var/opt/cassandra/mykeyspace/MyTWCSTable-ed2fa920c27411eabe8a17a890aa6eb4/nb-1001329-big
(7.481GiB)
INFO [SSTableBatchOpen:26] 2025-06-23 10:41:38,679 UTC
SSTableReaderBuilder.java:354 - Opening
/var/opt/cassandra/mykeyspace/MyTWCSTable-ed2fa920c27411eabe8a17a890aa6eb4/nb-1005032-big
(8.213GiB)
DEBUG [main] 2025-06-23 10:41:39,228 UTC DiskBoundaryManager.java:54 -
Refreshing disk boundary cache for mykeyspace.MyTWCSTable
DEBUG [main] 2025-06-23 10:41:39,235 UTC DiskBoundaryManager.java:93 - Got
local ranges [<removed-for-readability>] (ringVersion = 30)
DEBUG [main] 2025-06-23 10:41:39,235 UTC DiskBoundaryManager.java:57 - Updating
boundaries from null to
DiskBoundaries{directories=[DataDirectory{location=/var/opt/cassandra}],
positions=[max(9223372036854775807)], ringVersion=30, directoriesVersion=0} for
mykeyspace.MyTWCSTable
DEBUG [main] 2025-06-23 10:41:39,236 UTC TimeWindowCompactionStrategy.java:68 -
Enabling tombstone compactions for TWCS
DEBUG [main] 2025-06-23 10:41:39,236 UTC TimeWindowCompactionStrategy.java:68 -
Enabling tombstone compactions for TWCS
INFO [main] 2025-06-23 10:41:39,242 UTC ColumnFamilyStore.java:484 -
Initializing mykeyspace.MyTWCSTable2
{code}
The SSTable is present on disk and at first glance I can not see a problem.
{code:java}
[ec2-user@ip-1-2-3-4 log]$ sudo ls -la
/var/opt/cassandra/mykeyspace/MyTWCSTable-ed2fa920c27411eabe8a17a890aa6eb4/ |
grep nb-9978
-rw-r--r-- 1 user user 5711584 May 28 00:35 nb-997878-big-CompressionInfo.db
-rw-r--r-- 1 user user 7899003536 May 28 00:35 nb-997878-big-Data.db
-rw-r--r-- 1 user user 9 May 28 00:35 nb-997878-big-Digest.crc32
-rw-r--r-- 1 user user 6440 May 28 00:35 nb-997878-big-Filter.db
-rw-r--r-- 1 user user 36811583 May 28 00:35 nb-997878-big-Index.db
-rw-r--r-- 1 user user 17827 May 28 00:35 nb-997878-big-Statistics.db
-rw-r--r-- 1 user user 1197 May 28 00:35 nb-997878-big-Summary.db
-rw-r--r-- 1 user user 92 May 28 00:35 nb-997878-big-TOC.txt
[ec2-user@ip-1-2-3-4 log]$
{code}
Also it looks like Cassandra is running fine. I see no further issues on
various metrics or in the logs.
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