sstableexpiredblockers

Outputs the SSTables that prevent an SSTable from dropping.

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

Outputs the SSTables that prevent an SSTable from dropping.

By identifying the blocking SSTables, you can take correction active so the database can drop entire SSTables during compaction. SSTables are dropped during compaction when they contain only expired tombstones and is guaranteed not to cover any data in other SSTables.

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

Synopsis

sstableexpiredblockers [--dry-run] 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

--dry-run
Test command syntax and environment. Do not execute the command.
keyspace_name
Keyspace name. Required. Overrides the client_encryption_options in cassandra.yaml.
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

Output the blocking SSTables that prevent an SSTable from dropping

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

Test the output without executing sstableexpiredblockers

Restriction: DataStax Enterprise must be stopped before you run this command.
sstableexpiredblockers --dry-run cycling cyclist_races