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https://issues.apache.org/jira/browse/CASSANDRA-16?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12872847#action_12872847
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Jonathan Ellis edited comment on CASSANDRA-16 at 6/15/10 9:31 AM:
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06
make row size at which to drop to incremental compaction configurable
05
make row size 64 bits
04
add LazilyCompactedRow
03
r/m 'object count' abomination. fix BF serialization to only use top-level
columns (since those are the only ones it's ever checked for)
02
make single pass over columns for indexing
01
introduce AbstractCompactedRow, PrecompactedRow
was (Author: jbellis):
06
make row size at which to drop to incremental compaction configurable
05
make row size 64 bits
04
add LazilyCompactedRow
03
r/m 'object count' abomination. fix BF serialization to only use top-level
columns (since those
02
make single pass over columns for indexing
01
introduce AbstractCompactedRow, PrecompactedRow
> Memory efficient compactions
> -----------------------------
>
> Key: CASSANDRA-16
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Environment: All
> Reporter: Sandeep Tata
> Assignee: Jonathan Ellis
> Fix For: 0.7
>
> Attachments: 0001-introduce-AbstractCompactedRow-PrecompactedRow.txt,
> 0002-make-single-pass-over-columns-for-indexing.txt,
> 0003-r-m-object-count-abomination.-fix-BF-serialization-to-.txt,
> 0004-add-LazilyCompactedRow.txt, 0005-make-row-size-64-bits.txt,
> 0006-make-row-size-at-which-to-drop-to-incremental-compacti.txt
>
>
> The basic idea is to allow rows to get large enough that they don't have to
> fit in memory entirely, but can easily fit on a disk. The compaction
> algorithm today de-serializes the entire row in memory before writing out the
> compacted SSTable (see ColumnFamilyStore.doCompaction() and associated
> methods).
> The requirement is to have a compaction method with a lower memory
> requirement so we can support rows larger than available main memory. To
> re-use the old FB example, if we stored a user's inbox in a row, we'd want
> the inbox to grow bigger than memory so long as it fit on disk.
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