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https://issues.apache.org/jira/browse/CASSANDRA-19661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17850316#comment-17850316
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Stefan Miklosovic commented on CASSANDRA-19661:
-----------------------------------------------
I think I saw something like this very early in 5.0 development cycle but I can
not reproduce that anymore.
I wrote this trainer / prompt (1) which takes the sources or Cassandra, trains
them and one can ask questions against Cassandra codebase. It uses cassio and
langchain. I can not replicate the issue. After the training I can just restart
it fine.
If you want to try that, you need to pay to OpenAI to train it and put the
token into .env file where that script is like "OPENAI_API_KEY=..."
[https://gist.github.com/smiklosovic/98b52502df8061ec1d8c3546cf489628]
I am using the latest 5.0 branch.
> Cannot restart Cassandra 5 after creating a vector table and index
> ------------------------------------------------------------------
>
> Key: CASSANDRA-19661
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19661
> Project: Cassandra
> Issue Type: Bug
> Components: Feature/SAI
> Reporter: Sergio Rua
> Priority: Normal
> Fix For: 5.0-rc, 5.x
>
>
> I'm using llama-index and llama3 to train a model. I'm using a very simple
> code that reads some *.txt files from local and uploads them to Cassandra and
> then creates the index:
>
> {code:java}
> # Create the index from documents
> index = VectorStoreIndex.from_documents(
> documents,
> service_context=vector_store.service_context,
> storage_context=storage_context,
> show_progress=True,
> ) {code}
> This works well and I'm able to use a Chat app to get responses from the
> Cassandra data. however, right after, I cannot restart Cassandra. It'll break
> with the following error:
>
> {code:java}
> INFO [PerDiskMemtableFlushWriter_0:7] 2024-05-23 08:23:20,102
> Flushing.java:179 - Completed flushing
> /data/cassandra/data/gpt/docs_20240523-10c8eaa018d811ef8dadf75182f3e2b4/da-6-bti-Data.db
> (124.236MiB) for commitlog position
> CommitLogPosition(segmentId=1716452305636, position=15336)
> [...]
> WARN [MemtableFlushWriter:1] 2024-05-23 08:28:29,575
> MemtableIndexWriter.java:92 - [gpt.docs.idx_vector_docs] Aborting index
> memtable flush for
> /data/cassandra/data/gpt/docs-aea77a80184b11ef8dadf75182f3e2b4/da-3-bti...{code}
> {code:java}
> java.lang.IllegalStateException: null
> at
> com.google.common.base.Preconditions.checkState(Preconditions.java:496)
> at
> org.apache.cassandra.index.sai.disk.v1.vector.VectorPostings.computeRowIds(VectorPostings.java:76)
> at
> org.apache.cassandra.index.sai.disk.v1.vector.OnHeapGraph.writeData(OnHeapGraph.java:313)
> at
> org.apache.cassandra.index.sai.memory.VectorMemoryIndex.writeDirect(VectorMemoryIndex.java:272)
> at
> org.apache.cassandra.index.sai.memory.MemtableIndex.writeDirect(MemtableIndex.java:110)
> at
> org.apache.cassandra.index.sai.disk.v1.MemtableIndexWriter.flushVectorIndex(MemtableIndexWriter.java:192)
> at
> org.apache.cassandra.index.sai.disk.v1.MemtableIndexWriter.complete(MemtableIndexWriter.java:117)
> at
> org.apache.cassandra.index.sai.disk.StorageAttachedIndexWriter.complete(StorageAttachedIndexWriter.java:185)
> at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
> at
> java.base/java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1085)
> at
> org.apache.cassandra.io.sstable.format.SSTableWriter.commit(SSTableWriter.java:289)
> at
> org.apache.cassandra.db.compaction.unified.ShardedMultiWriter.commit(ShardedMultiWriter.java:219)
> at
> org.apache.cassandra.db.ColumnFamilyStore$Flush.flushMemtable(ColumnFamilyStore.java:1323)
> at
> org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1222)
> at
> org.apache.cassandra.concurrent.ExecutionFailure$1.run(ExecutionFailure.java:133)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.base/java.lang.Thread.run(Thread.java:829) {code}
> The table created by the script is as follows:
>
> {noformat}
> CREATE TABLE gpt.docs (
> partition_id text,
> row_id text,
> attributes_blob text,
> body_blob text,
> vector vector<float, 1024>,
> metadata_s map<text, text>,
> PRIMARY KEY (partition_id, row_id)
> ) WITH CLUSTERING ORDER BY (row_id ASC)
> AND additional_write_policy = '99p'
> AND allow_auto_snapshot = true
> AND bloom_filter_fp_chance = 0.01
> AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
> AND cdc = false
> AND comment = ''
> AND compaction = {'class':
> 'org.apache.cassandra.db.compaction.UnifiedCompactionStrategy',
> 'scaling_parameters': 'T4', 'target_sstable_size': '1GiB'}
> AND compression = {'chunk_length_in_kb': '16', 'class':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
> AND memtable = 'default'
> AND crc_check_chance = 1.0
> AND default_time_to_live = 0
> AND extensions = {}
> AND gc_grace_seconds = 864000
> AND incremental_backups = true
> AND max_index_interval = 2048
> AND memtable_flush_period_in_ms = 0
> AND min_index_interval = 128
> AND read_repair = 'BLOCKING'
> AND speculative_retry = '99p';
> CREATE CUSTOM INDEX eidx_metadata_s_docs ON gpt.docs (entries(metadata_s))
> USING 'org.apache.cassandra.index.sai.StorageAttachedIndex';
> CREATE CUSTOM INDEX idx_vector_docs ON gpt.docs (vector) USING
> 'org.apache.cassandra.index.sai.StorageAttachedIndex';{noformat}
> Thank you
>
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