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V

Visualisation

Volume

Volume group

1 - Visualisation

A document comprising some Javascript code for visualising data, e.g. pie charts, heat maps, line graphs etc. Visualisations are not baked into Stroom, they are content, so can be created/modified/shared by Stroom users.

2 - Volume

In Stroom a Volume is a logical storage area that Stroom can write data to. Volumes are associated with a path on a file system that can either be local to the Stroom node or on a shared file system.

Stroom has two types of Volume; Index Volumes and Data Volumes.

  • Index Volume - Where the Lucene Index Shards are written to. An Index Volume must belong to a Volume group .
  • Data Volume - Where streams are written to. When writing Stream data Stroom will pick a data volume using a volume selector as configured by the Property stroom.data.filesystemVolume.volumeSelector.

3 - Volume group

A Volume Group is a collection of one or more Index Volumes. Index volumes must belong to a volume group and Indexes are configured to write to a particular Volume Group.

When Stroom is writing data to a Volume Group it will choose which of the Volumes in the group to write to using a volume selector as configured by the Property stroom.volumes.volumeSelector.