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https://issues.apache.org/jira/browse/CASSANDRA-18280?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Caleb Rackliffe updated CASSANDRA-18280:
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Epic Link: CASSANDRA-18473 (was: CASSANDRA-16052)
> Investigate initial size of GrowableByteArrayDataOutput in RAMIndexOutput
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-18280
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18280
> Project: Cassandra
> Issue Type: Task
> Components: Feature/SAI
> Reporter: Mike Adamson
> Priority: Normal
>
> The GrowableByteArrayDataOutput in RAMIndexOutput is currently initialized
> with a size of 128 bytes. There is no explanation as to why this size was
> chosen.
> The GrowableByteArrayDataOutput does not lazily allocate memory but only ever
> allocates enough for each write operation. This can lead to a lot of fresh
> allocations and calls to System.arrayCopy.
> Since RAMIndexOutput is used to build the on-disk postings in SAI it is
> likely that the size of the in-memory array is going to grow considerably
> more that 128 bytes.
> We should investigate changing this initial value to something higher and
> possibly changing the GrowableByteArrayDataOutput class to allocate in blocks
> rather than write increments.
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