nodetool compactionstats
Prints statistics about compactions.
Synopsis
nodetool [<connection_options>] compactionstats
[-A][-H]
Syntax legend
| Syntax conventions | Description |
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Italic, bold, or |
Syntax diagrams and code samples use one or more of these styles to mark placeholders for variable values. Replace placeholders with a valid option or your own user-defined value. In CQL statements, angle brackets are required to enclose data types in a set, list, map, or tuple.
Separate the data types with a comma.
For example: In Search CQL statements, angle brackets are used to identify the entity and literal value to overwrite the XML element in the schema and |
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Square brackets surround optional command arguments. Do not type the square brackets. |
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Parentheses identify a group to choose from. Do not type the parentheses. |
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A pipe separates alternative elements. Type any one of the elements. Do not type the pipe. |
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Indicates that you can repeat the syntax element as often as required. |
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Single quotation marks must surround literal strings in CQL statements.
Use single quotation marks to preserve upper case.
+
For Search CQL only: Single quotation marks surround an entire XML schema declaration, such as |
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Map collection.
Curly braces enclose maps ( |
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Ends a CQL statement. |
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Separate command line options from command arguments with two hyphens. This syntax is useful when arguments might be mistaken for command line options. |
Options
If an option has a short and long form, both forms are given, separated by a comma.
- -h, --host hostname
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The hostname or IP address of a remote node or nodes. When omitted, the default is the local machine.
- -p, --port jmx_port
-
The JMX port number.
- -pw, --password jmxpassword
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The JMX password for authenticating with secure JMX. If a password is not provided, you are prompted to enter one.
- -pwf, --password-file jmx_password_filepath
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The filepath to the file that stores JMX authentication credentials.
- -u, --username jmx_username
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The username for authenticating with secure JMX.
- -A, --all
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Displays additional details about the compactions that are in process. Use this option to view the complete status of each compaction request.
- -H, --human-readable
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Display bytes in human readable form: KiB (kibibyte), MiB (mebibyte), GiB (gibibyte), TiB (tebibyte).
Examples
Get information about compaction
The total column shows the total number of uncompressed bytes of SSTables being compacted.
To see the names of the compacted SSTables, open the system log.
nodetool compactionstats
pending tasks: 5
compaction type keyspace table completed total unit progress
Compaction Keyspace1 Standard1 282310680 302170540 bytes 93.43%
Compaction Keyspace1 Standard1 58457931 307520780 bytes 19.01%
Active compaction remaining time : 0h00m16s
Display additional details about compaction
Use the -A option to display additional details about the compactions that are in process and the structure of the compaction hierarchy:
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Level information for UnifiedCompactionStrategy (UCS)
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Level information for LeveledCompactionStrategy (LCS)
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Bucket information for SizeTieredCompactionStrategy (STCS)
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Time windows for TimeWindowCompactionStrategy (TWCS)
The output also displays which buckets perform the compactions.
nodetool compactionstats -A
Example output:
pending tasks: 1
write amplification: 1.54
- keyspace1.standard1: 1
- keyspace1.standard1 write amplification.: 1.54
id compaction type keyspace table completed total unit progress description
ef70ca50-70ea-11f0-a4a9-fb43b54238a8 Compaction keyspace1 standard1 0 72136992 bytes 0.00%
Active compaction remaining time : 0h00m04s
Aggregated view:
keyspace1.standard1/UnifiedCompactionStrategy
Shard/Unrepaired-shard_0
Bucket W T F min size max size Tot. SSTables Tot. size (bytes) Compactions Comp. SSTables Read (bytes/sec) Write (bytes/sec) Tot. comp. size/Read/Written (bytes)
0 -8 2 10 0.000KiB 20.020MiB 2 61.925MiB 1/1 2/2 0.000KiB/s 6.515MiB/s 68.795MiB/0.000KiB/2.421MiB