sstablescrub

An offline version of nodetool scrub. It attempts to remove the corrupted parts while preserving non-corrupted data.

The sstablescrub utility is an offline version of nodetool scrub. It attempts to remove the corrupted parts while preserving non-corrupted data. Because sstablescrub runs offline, it can correct errors that nodetool scrub cannot. If an SSTable cannot be read due to corruption, it will be left on disk.

If scrubbing results in dropping rows, new SSTables become unrepaired. However, if no bad rows are detected, the SSTable keeps its original repairedAt field, which denotes the time of the repair.

Procedure

  1. Before using sstablescrub, try rebuilding the tables using nodetool scrub.

    If nodetool scrub does not fix the problem, use sstablescrub.

  2. Shut down the node.
  3. Run the utility: 
    sstablescrub [options] keyspace table
    --debug
    Display stack traces.
    -e, --header-fix argument
    Check SSTable serialization-headers and repair issues. Takes the following arguments:
    validate-only
    Validate serialization-headers only. Do not attempt any repairs and do not continue with the scrub once the validation is complete.
    validate
    Validate serialization-headers and continue with the scrub once the validation is complete. (Default)
    fix-only
    Validate and repair only the serialization-headers. Do not continue with the scrub once serialization-header validation and repairs are complete.
    fix
    Validate and repair serialization-headers and perform a normal scrub. Do not repair and do not continue with the scrub if serialization-header validation encounters errors.
    off
    Do not perform serialization-header validation checks.
    -h, --help
    Display help.
    -m, --manifest-check
    Only check and repair the leveled manifest, without actually scrubbing the SSTables.
    --reinsert-overflowed-ttl
    Rewrites SSTables containing rows with overflowed expiration time with the maximum expiration date of 2038-01-19T03:14:06+00:00 using the original timestamp + 1 (ms).
    -s, --skip-corrupted
    Skip corrupt rows in counter tables.
    -v, --verbose
    Verbose output.