sstablelevelreset

Resets the level to zero on a set of SSTables.

cassandra.yaml

The location of the cassandra.yaml file depends on the type of installation:
Package installations /etc/dse/cassandra/cassandra.yaml
Tarball installations installation_location/resources/cassandra/conf/cassandra.yaml

Uses LeveledCompactionStrategy to reset the level to zero on a set of SSTables. If the SSTable is already at level 0, no change occurs. If the SSTable is releveled, the metadata is rewritten to designate the level at 0.

Restriction: DataStax Enterprise must be stopped before you run this command.

Synopsis

sstablelevelreset [--really-reset] keyspace_name table_name
Table 1. Legend
Syntax conventions Description
UPPERCASE Literal keyword.
Lowercase Not literal.
Italics Variable value. Replace with a valid option or user-defined value.
[ ] Optional. Square brackets ( [ ] ) surround optional command arguments. Do not type the square brackets.
( ) Group. Parentheses ( ( ) ) identify a group to choose from. Do not type the parentheses.
| Or. A vertical bar ( | ) separates alternative elements. Type any one of the elements. Do not type the vertical bar.
... Repeatable. An ellipsis ( ... ) indicates that you can repeat the syntax element as often as required.
'Literal string' Single quotation ( ' ) marks must surround literal strings in CQL statements. Use single quotation marks to preserve upper case.
{ key:value } Map collection. Braces ( { } ) enclose map collections or key value pairs. A colon separates the key and the value.
<datatype1,datatype2> Set, list, map, or tuple. Angle brackets ( < > ) enclose data types in a set, list, map, or tuple. Separate the data types with a comma.
cql_statement;End CQL statement. A semicolon ( ; ) terminates all CQL statements.
[ -- ] Separate the command line options from the command arguments with two hyphens ( -- ). This syntax is useful when arguments might be mistaken for command line options.
' <schema> ... </schema> ' Search CQL only: Single quotation marks ( ' ) surround an entire XML schema declaration.
@xml_entity='xml_entity_type' Search CQL only: Identify the entity and literal value to overwrite the XML element in the schema and solrconfig files.

The short form and long form parameters are comma-separated.

Command arguments

keyspace_name
Keyspace name. Required. Overrides the client_encryption_options in cassandra.yaml.
--really-reset
Specifies that DSE is stopped.
table_name
Table name. Required.

Examples

Verify DataStax Enterprise is not running

nodetool status
Datacenter: Graph
================================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address        Load       Tokens       Owns    Host ID                               Rack
UN  10.200.177.92  265.04 KiB  1            ?       980cab6a-2e5d-44c6-b897-0733dde580ac  rack1
DN  10.200.177.94  426.21 KiB  1            ?       7ecbbc0c-627d-403e-b8cc-a2daa93d9ad3  rack1

Reset cyclist_name to level 0

Restriction: DataStax Enterprise must be stopped before you run this command.
sstablelevelreset cycling cyclist_name
Skipped /var/lib/cassandra/data/cycling/cyclist_name-4157ef22ce4411e8949e33016bf887c0/aa-2-bti-Data.db since it is already on level 0
Skipped /var/lib/cassandra/data/cycling/cyclist_name-4157ef22ce4411e8949e33016bf887c0/aa-3-bti-Data.db since it is already on level 0