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https://issues.apache.org/jira/browse/CASSANDRA-20577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Capwell updated CASSANDRA-20577:
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Status: Ready to Commit (was: Review In Progress)
Starting commit
CI Results (pending):
||Branch||Source||Circle CI||Jenkins||
|cassandra-5.0|[branch|https://github.com/dcapwell/cassandra/tree/commit_remote_branch/CASSANDRA-20577-cassandra-5.0-355B552D-DFCF-4FEF-AAA2-92FD5A44D2B1]|[build|unknown]|[build|unknown]|
|trunk|[branch|https://github.com/dcapwell/cassandra/tree/commit_remote_branch/CASSANDRA-20577-trunk-355B552D-DFCF-4FEF-AAA2-92FD5A44D2B1]|[build|unknown]|[build|unknown]|
> zero copy streaming allocates direct memory that isn't used, but does help to
> fragment the memory space
> -------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-20577
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20577
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Consistency/Streaming
> Reporter: David Capwell
> Assignee: David Capwell
> Priority: Normal
> Fix For: 5.x
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> This is forked from the patch to CASSANDRA-20567 as it isn’t related to SAI,
> so better to isolate.
> When Zero Copy Streaming creates its per-file writers, it allocates direct
> memory per file; but this allocation is never used. This causes issues as
> the direct memory managed by Cassandra gets fragmented, so we run out of
> space and OOM
> {code}
> INFO [node3_Stream-Deserializer-/127.0.0.1:7012-cf906983] 2025-04-21
> 21:55:51,613 ERROR 21:55:51 [Stream 13815658-1dd2-11b2-98f1-3dfc14dd20f3]
> Error while reading sstable from stream for table = ks1.tbl
> java.lang.OutOfMemoryError: Cannot reserve 2097152 bytes of direct buffer
> memory (allocated: 1055235964, limit: 1056309248)
> {code}
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