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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1041) Skip large size (Configurable) SSTable in minor or/and major compaction
Date Tue, 04 May 2010 02:09:57 GMT


Jonathan Ellis commented on CASSANDRA-1041:

see CASSANDRA-16 for that

> Skip large size (Configurable) SSTable in minor or/and major compaction
> -----------------------------------------------------------------------
>                 Key: CASSANDRA-1041
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Schubert Zhang
>            Priority: Minor
>         Attachments: CASSANDRA-1041-0.6.1.patch, CASSANDRA-1041-0.6.patch
> When the SSTable files are large enough, such as 100GB, the compaction (include minor
and major) cost is big (disk IO, CPU, memory), etc.
> In some applications, we accept not compcating all SSTables to the final very large ones.

> This feature provide two optional configurable attributes MinorCompactSkipInGB and MajorCompactSkipInGB
for each ColumnFamily. 
> The optional MinorCompactSkipInGB attribute specifies the maximum size of SSTables which
will be compcated in minor-compaction. The SSTables larger than MinorCompactSkipInGB will
be skipped. The optional MajorCompactSkipInGB attribute is same for major-compaction.
> The default of these attributes are 0, means do not skip, just as current 0.6.1.

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