mirror of https://github.com/apache/cassandra
83 lines
2.8 KiB
ReStructuredText
83 lines
2.8 KiB
ReStructuredText
.. Licensed to the Apache Software Foundation (ASF) under one
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.. or more contributor license agreements. See the NOTICE file
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.. distributed with this work for additional information
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.. regarding copyright ownership. The ASF licenses this file
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.. to you under the Apache License, Version 2.0 (the
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.. "License"); you may not use this file except in compliance
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.. with the License. You may obtain a copy of the License at
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..
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.. http://www.apache.org/licenses/LICENSE-2.0
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..
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.. Unless required by applicable law or agreed to in writing, software
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.. distributed under the License is distributed on an "AS IS" BASIS,
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.. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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.. See the License for the specific language governing permissions and
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.. limitations under the License.
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sstablelevelreset
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-----------------
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If LeveledCompactionStrategy is set, this script can be used to reset level to 0 on a given set of sstables. This is useful if you want to, for example, change the minimum sstable size, and therefore restart the compaction process using this new configuration.
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See http://cassandra.apache.org/doc/latest/operating/compaction.html#leveled-compaction-strategy for information on how levels are used in this compaction strategy.
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Cassandra must be stopped before this tool is executed, or unexpected results will occur. Note: the script does not verify that Cassandra is stopped.
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ref: https://issues.apache.org/jira/browse/CASSANDRA-5271
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Usage
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^^^^^
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sstablelevelreset --really-reset <keyspace> <table>
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The really-reset flag is required, to ensure this intrusive command is not run accidentally.
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Table not found
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^^^^^^^^^^^^^^^
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If the keyspace and/or table is not in the schema (e.g., if you misspelled the table name), the script will return an error.
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Example::
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ColumnFamily not found: keyspace/evenlog.
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Table has no sstables
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^^^^^^^^^^^^^^^^^^^^^
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Example::
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Found no sstables, did you give the correct keyspace/table?
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Table already at level 0
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^^^^^^^^^^^^^^^^^^^^^^^^
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The script will not set the level if it is already set to 0.
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Example::
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Skipped /var/lib/cassandra/data/keyspace/eventlog-65c429e08c5a11e8939edf4f403979ef/mc-1-big-Data.db since it is already on level 0
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Table levels reduced to 0
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^^^^^^^^^^^^^^^^^^^^^^^^^
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If the level is not already 0, then this will reset it to 0.
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Example::
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sstablemetadata /var/lib/cassandra/data/keyspace/eventlog-6365332094dd11e88f324f9c503e4753/mc-8-big-Data.db | grep -i level
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SSTable Level: 1
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sstablelevelreset --really-reset keyspace eventlog
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Changing level from 1 to 0 on /var/lib/cassandra/data/keyspace/eventlog-6365332094dd11e88f324f9c503e4753/mc-8-big-Data.db
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sstablemetadata /var/lib/cassandra/data/keyspace/eventlog-6365332094dd11e88f324f9c503e4753/mc-8-big-Data.db | grep -i level
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SSTable Level: 0
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