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Nodetool scrub¶
NAME¶
scrub - Help identify and fix corrupted SSTable. Remove faulty data, eliminate tombstoned rows that have surpassed the table’s gc_grace period, and fix out-of-order rows and partitions.
SYNOPSIS¶
nodetool [(-h <host> | --host <host>)] [(-p <port> | --port <port>)]
[(-pp | --print-port)] [(-pw <password> | --password <password>)]
[(-pwf <passwordFilePath> | --password-file <passwordFilePath>)]
[(-ns | --no-snapshot)]
[(-s | --skip-corrupted)]
[(-m <scrub_mode> | --mode <scrub_mode>)]
[--] <keyspace> [<table...>]
Supported scrub modes: ABORT, SKIP, SEGREGATE, VALIDATE
OPTIONS¶
Parameter |
Description |
|---|---|
-ns / –no-snapshot |
Do not take a snapshot of all scrubbed tables before starting scrub (default false). |
-s / –skip-corrupted |
Skip corrupted rows or partitions even when scrubbing counter tables. (Deprecated, use ‘–mode’ instead. default false) |
-m <scrub_mode> / –mode <scrub_mode> |
How to handle corrupt data (one of: ABORT|SKIP|SEGREGATE|VALIDATE, default ABORT; overrides ‘–skip-corrupted’) |
-- This option can be used to separate command-line options from the list of argument, (useful when arguments might be mistaken for command-line options.
<keyspace> The keyspace to scrub.
[<table...>] Optional. One or more tables to scrub. By default, all tables in the keyspace are scrubbed.
SCRUB MODES¶
Scrub mode |
Description |
|---|---|
ABORT |
Abort scrubbing when the first validation error occurs. (default). |
SKIP |
Skip corrupted rows or partitions. (equivalent to the legacy –skip-corrupted option). |
SEGREGATE |
Sort out-of-order rows or partitions by segregating them into additional SSTables. |
VALIDATE |
Read-only mode: report any corruptions found while scrubbing but do not fix them. By default, corrupt SSTables are moved into a “quarantine” subdirectory so they will not be subject to compaction. |
Examples¶
Scrub all tables in a keyspace (mykeyspace)
> nodetool scrub mykeyspace
Scrub a specific table (mytable) in a keyspace (mykeyspace)
> nodetool scrub mykeyspace mytable
Scrub a specific table (mytable) in a keyspace (mykeyspace) in SEGREGATE mode
> nodetool scrub -m SEGREGATE mykeyspace mytable
Scrub a specific table (mytable) in a keyspace (mykeyspace) in VALIDATE mode without taking a preliminary snapshot
> nodetool scrub -m VALIDATE --no-snapshot mykeyspace mytable
Copyright
© 2016, The Apache Software Foundation.
Apache®, Apache Cassandra®, Cassandra®, the Apache feather logo and the Apache Cassandra® Eye logo are either registered trademarks or trademarks of the Apache Software Foundation in the United States and/or other countries. No endorsement by The Apache Software Foundation is implied by the use of these marks.