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https://issues.apache.org/jira/browse/CASSANDRA-3611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167169#comment-13167169
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Vijay commented on CASSANDRA-3611:
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" This may already have been implied, but on reads it might make sense to
support a percentage checking chance similarly to read-repair "
- Sure
" Any measurements on relative cost of checksumming? "
- below are the hot methods... I believe this can be further optimized with
CASSANDRA-3610
sec. %
1480.474 100.00 <Total>
756.717 51.11 crc32
387.767 26.19 <static>@0x54999 (<snappy-1.0.4.1-libsnappyjava.so>)
54.814 3.70
org.apache.cassandra.io.compress.CompressedRandomAccessReader.<init>(java.lang.String,
org.apache.cassandra.io.compress.CompressionMetadata, boolean)
46.676 3.15
org.apache.cassandra.io.util.RandomAccessReader.<init>(java.io.File, int,
boolean)
45.697 3.09 Copy::pd_disjoint_words(HeapWord*, HeapWord*, unsigned long)
39.417 2.66 memcpy
36.931 2.49 <static>@0xd8e9 (<libpthread-2.5.so>)
23.272 1.57 CompactibleFreeListSpace::block_size(const HeapWord*) const
22.766 1.54 SpinPause
> Make checksum on a compressed blocks optional
> ---------------------------------------------
>
> Key: CASSANDRA-3611
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3611
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.1
> Reporter: Vijay
> Assignee: Vijay
> Priority: Minor
> Fix For: 1.1
>
>
> Currently every uncompressed block is run against checksum algo, there is cpu
> overhead in doing same... We might want to make it configurable/optional for
> some use cases which might not require checksum all the time.
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