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轉: http://blog.csdn.net/u013980127/article/details/52443155
下面代碼在Hadoop 2.6.4 + Hbase 1.2.2 + centos 6.5 + jdk 1.8上運行通過。
HBase操作
一般操作
| 命令 | 說明 |
|---|---|
| status | 顯示集群狀態. 選項:‘summary’, ‘simple’, or ‘detailed’. 默認值:‘summary’. hbase> status hbase> status ‘simple’ hbase> status ‘summary’ hbase> status ‘detailed’ |
| version | 顯示版本。 hbase> version |
| whoami | 顯示當前用戶與組。 hbase> whoami |
表管理
1. alter
修改表結構必須先disable
Shell:
語法:alter 't1', {NAME => 'f1'}, {NAME => 'f2', METHOD => 'delete'}
必須指定列族。示例:
表t1的列族f1,修改或增加VERSIONS為5
hbase> alter ‘t1’, NAME => ‘f1’, VERSIONS => 5
也可以同時修改多個列族:
hbase> alter ‘t1’, ‘f1’, {NAME => ‘f2’, IN_MEMORY => true}, {NAME => ‘f3’, VERSIONS => 5}
刪除表t1的f1列族:
hbase> alter ‘t1’, NAME => ‘f1’, METHOD => ‘delete’
或
hbase> alter ‘t1’, ‘delete’ => ‘f1’
也可以修改table-scope屬性,例如MAX_FILESIZE, READONLY,
MEMSTORE_FLUSHSIZE, DEFERRED_LOG_FLUSH等。
例如,修改region的最大大小為128MB:
hbase> alter ‘t1’, MAX_FILESIZE => ‘134217728’
也可以設置表的coprocessor屬性:
hbase> alter ‘t1’,
‘coprocessor’=>’hdfs:///foo.jar|com.foo.FooRegionObserver|1001|arg1=1,arg2=2’
可以設置復數個coprocessor,這時會自動添加序列以唯一標示coprocessor。
coprocessor屬性設置語法:
[coprocessor jar file location] | class name | [priority] | [arguments]
也可以設置configuration給表或列族:
hbase> alter ‘t1’, CONFIGURATION => {‘hbase.hregion.scan.loadColumnFamiliesOnDemand’ => ‘true’}
hbase> alter ‘t1’, {NAME => ‘f2’, CONFIGURATION => {‘hbase.hstore.blockingStoreFiles’ => ’10’}}
也可以移除table-scope屬性:
hbase> alter ‘t1’, METHOD => ‘table_att_unset’, NAME => ‘MAX_FILESIZE’
hbase> alter ‘t1’, METHOD => ‘table_att_unset’, NAME => ‘coprocessor$1’
可以通過一個命令進行多項修改:
hbase> alter ‘t1’, { NAME => ‘f1’, VERSIONS => 3 },
{ MAX_FILESIZE => ‘134217728’ }, { METHOD => ‘delete’, NAME => ‘f2’ },
OWNER => ‘johndoe’, METADATA => { ‘mykey’ => ‘myvalue’ }
Java實現:
/**
* 修改表結構,增加列族
*
* @param tableName 表名
* @param family 列族
*
* @throws IOException
*/
public static void putFamily(String tableName, String family) throws IOException {
try (Connection connection = ConnectionFactory.createConnection(configuration);
Admin admin = connection.getAdmin()
) {
TableName tblName = TableName.valueOf(tableName);
if (admin.tableExists(tblName)) {
admin.disableTable(tblName);
HColumnDescriptor cf = new HColumnDescriptor(family);
admin.addColumn(TableName.valueOf(tableName), cf);
admin.enableTable(tblName);
} else {
log.warn(tableName + " not exist.");
}
}
}
# 調用示例
putFamily("blog", "note");
2. create
創建表。
Shell:
語法:
create 'table', { NAME => 'family', VERSIONS => VERSIONS } [, { NAME => 'family', VERSIONS => VERSIONS }]
示例:
hbase> create ‘t1’, {NAME => ‘f1’, VERSIONS => 5}
hbase> create ‘t1’, {NAME => ‘f1’}, {NAME => ‘f2’}, {NAME => ‘f3’}
hbase> # The above in shorthand would be the following:
hbase> create ‘t1’, ‘f1’, ‘f2’, ‘f3’
hbase> create ‘t1’, {NAME => ‘f1’, VERSIONS => 1, TTL => 2592000, BLOCKCACHE => true}
hbase> create ‘t1’, {NAME => ‘f1’, CONFIGURATION => {‘hbase.hstore.blockingStoreFiles’ => ’10’}}
Java示例:
/** * 創建表 * * @param tableName 表名 * @param familyNames 列族 * * @throws IOException */ public static void createTable(String tableName, String[] familyNames) throws IOException { try (Connection connection = ConnectionFactory.createConnection(configuration); Admin admin = connection.getAdmin() ) { TableName table = TableName.valueOf(tableName); if (admin.tableExists(table)) { log.info(tableName + " already exists"); } else { HTableDescriptor hTableDescriptor = new HTableDescriptor(table); for (String family : familyNames) { hTableDescriptor.addFamily(new HColumnDescriptor(family)); } admin.createTable(hTableDescriptor); } } } # 調用例 createTable("blog", new String[]{"author", "contents"});
3. describe
查詢表結構
hbase> describe ‘t1’
4. disable
無效化指定表
hbase> disable ‘t1’
5. disable_all
無效化(正則)匹配的表
hbase> disable_all ‘t.*’
6. is_disabled
驗證指定的表是否是無效的
hbase> is_disabled ‘t1’
1
7. drop
刪除表。表必須是無效的。
Shell:
hbase> drop ‘t1’
- 1
- 1
Java實現:
/** * 刪除表 * * @param tableName 表名 * * @throws IOException */ public static void dropTable(String tableName) throws IOException { try (Connection connection = ConnectionFactory.createConnection(configuration); Admin admin = connection.getAdmin() ) { TableName table = TableName.valueOf(tableName); if (admin.tableExists(table)) { admin.disableTable(table); admin.deleteTable(table); } } } #調用例 dropTable("blog");
8. drop_all
刪除所有正則匹配的表。
hbase> drop_all ‘t.*’
- 1
- 1
9. enable
使指定表有效化。
hbase> enable ‘t1’
- 1
- 1
10. enable_all
使正則匹配的所有表有效。
hbase> enable_all ‘t.*’
- 1
- 1
11. is_enabled
驗證指定表是否有效
hbase> is_enabled ‘t1’
- 1
- 1
12. exists
指定表是否存在。
hbase> exists ‘t1’
- 1
- 1
13. list
列出HBase中所有表,可以通過正則過濾。
hbase> list hbase> list ‘abc.*’
- 1
- 2
- 1
- 2
14. show_filters
顯示所有過濾器。
hbase> show_filters hbase(main):066:0> show_filters DependentColumnFilter KeyOnlyFilter ColumnCountGetFilter SingleColumnValueFilter PrefixFilter SingleColumnValueExcludeFilter FirstKeyOnlyFilter ColumnRangeFilter TimestampsFilter FamilyFilter QualifierFilter ColumnPrefixFilter RowFilter MultipleColumnPrefixFilter InclusiveStopFilter PageFilter ValueFilter ColumnPaginationFilter
15. alter_status
獲取alter執行的狀態。
語法:alter_status ‘tableName’
hbase> alter_status ‘t1’
- 1
- 1
16. alter_async
異步執行alter,通過alter_status獲取執行狀態。
數據操作
1. count
統計表的行數。
Shell:
該操作執行的時間可能會比較長 (運行mapreduce執行統計 '$HADOOP_HOME/bin/hadoop jar hbase.jar rowcount'). 默認每1000行(可以指定步數)顯示當前總行數。Scan caching默認開啟,默認大小為10,也可以設置: hbase> count ‘t1’ hbase> count ‘t1’, INTERVAL => 100000 hbase> count ‘t1’, CACHE => 1000 hbase> count ‘t1’, INTERVAL => 10, CACHE => 1000 也可以通過表的引用執行: hbase> t.count hbase> t.count INTERVAL => 100000 hbase> t.count CACHE => 1000 hbase> t.count INTERVAL => 10, CACHE => 1000
Java實現:
/** * 統計行數 * * @param tableName 表名 * * @return 行數 * * @throws IOException */ public static long count(String tableName) throws IOException { final long[] rowCount = {0}; try (Connection connection = ConnectionFactory.createConnection(configuration); Table table = connection.getTable(TableName.valueOf(tableName)) ) { Scan scan = new Scan(); scan.setFilter(new FirstKeyOnlyFilter()); ResultScanner resultScanner = table.getScanner(scan); resultScanner.forEach(result -> { rowCount[0] += result.size(); }); } System.out.println("行數: " + rowCount[0]); return rowCount[0]; } #調用示例 count("blog");
2. delete
刪除指定數據。
Shell:
語法:delete 'table', 'rowkey', 'family:column' [, 'timestamp'] 刪除t1表的r1行、c1列並且時間戳為ts1的數據: hbase> delete ‘t1’, ‘r1’, ‘c1’, ts1 也可以通過表引用調用該命令: hbase> t.delete ‘r1’, ‘c1’, ts1
Java實現:
/** * 刪除指定數據 * <p> * columns為空, 刪除指定列族的全部數據; * family為空時, 刪除指定行鍵的全部數據; * </p> * * @param tableName 表名 * @param rowKey 行鍵 * @param family 列族 * @param columns 列集合 * * @throws IOException */ public static void deleteData(String tableName, String rowKey, String family, String[] columns) throws IOException { try (Connection connection = ConnectionFactory.createConnection(configuration); Table table = connection.getTable(TableName.valueOf(tableName)) ) { Delete delete = new Delete(Bytes.toBytes(rowKey)); if (null != family && !"".equals(family)) { if (null != columns && columns.length > 0) { // 刪除指定列 for (String column : columns) { delete.addColumn(Bytes.toBytes(family), Bytes.toBytes(column)); } } else { // 刪除指定列族 delete.addFamily(Bytes.toBytes(family)); } } else { // 刪除指定行 // empty, nothing to do } table.delete(delete); } } # 調用示例 deleteData("blog", "rk12", "author", new String[] { "name", "school" }); deleteData("blog", "rk11", "author", new String[] { "name" }); deleteData("blog", "rk10", "author", null); deleteData("blog", "rk9", null, null);
3. deleteall
刪除行。
語法:deleteall 'tableName', 'rowkey' [, 'column', 'timestamp'] hbase> deleteall ‘t1’, ‘r1’ hbase> deleteall ‘t1’, ‘r1’, ‘c1’ hbase> deleteall ‘t1’, ‘r1’, ‘c1’, ts1 也可以通過表引用調用該命令: hbase> t.deleteall ‘r1’ hbase> t.deleteall ‘r1’, ‘c1’ hbase> t.deleteall ‘r1’, ‘c1’, ts1
4. get
獲取某行數據。
Shell:
語法: get 'tableName', 'rowkey',[,....] 選項包括:列集合、時間戳、時間范圍或版本 示例: hbase> get ‘t1’, ‘r1’ hbase> get ‘t1’, ‘r1’, {TIMERANGE => [ts1, ts2]} hbase> get 'blog', 'rk1', 'author:name' hbase>get 'blog', 'rk1', { COLUMN => 'author:name' } hbase> get ‘t1’, ‘r1’, {COLUMN => ‘c1’, TIMESTAMP => ts1} hbase> get ‘t1’, ‘r1’, {COLUMN => ‘c1’, TIMERANGE => [ts1, ts2], VERSIONS => 4} hbase> get ‘t1’, ‘r1’, {COLUMN => ‘c1’, TIMESTAMP => ts1, VERSIONS => 4} hbase> get ‘t1’, ‘r1’, {FILTER => “ValueFilter(=, ‘binary:abc’)”} hbase> get ‘t1’, ‘r1’, ‘c1’ hbase> get ‘t1’, ‘r1’, ‘c1’, ‘c2’ hbase> get ‘t1’, ‘r1’, [‘c1’, ‘c2’] 也可以在列上指定FORMATTER,默認toStringBinary。 可以使用org.apache.hadoop.hbase.util.Bytes中預定義的方法 (例如:toInt, toString) ; 也可以自定義方法:'c(MyFormatterClass).format'。 例如 cf:qualifier1 and cf:qualifier2: hbase> get ‘t1’, ‘r1’ {COLUMN => [‘cf:qualifier1:toInt’, ‘cf:qualifier2:c(org.apache.hadoop.hbase.util.Bytes).toInt’] } 注:只能在列上指定FORMATTER,不能針對列族的所有列。 表的引用(通過get_table or create_table獲得引用)也可以使用get命令,例如 t是表t1的引用(t = get_table 't1'),則: hbase> t.get ‘r1’ hbase> t.get ‘r1’, {TIMERANGE => [ts1, ts2]} hbase> t.get ‘r1’, {COLUMN => ‘c1’} hbase> t.get ‘r1’, {COLUMN => [‘c1’, ‘c2’, ‘c3’]} hbase> t.get ‘r1’, {COLUMN => ‘c1’, TIMESTAMP => ts1} hbase> t.get ‘r1’, {COLUMN => ‘c1’, TIMERANGE => [ts1, ts2], VERSIONS => 4} hbase> t.get ‘r1’, {COLUMN => ‘c1’, TIMESTAMP => ts1, VERSIONS => 4} hbase> t.get ‘r1’, {FILTER => “ValueFilter(=, ‘binary:abc’)”} hbase> t.get ‘r1’, ‘c1’ hbase> t.get ‘r1’, ‘c1’, ‘c2’ hbase> t.get ‘r1’, [‘c1’, ‘c2’]
Java實現:
/** * 獲取指定數據 * <p> * column為空, 檢索指定列族的全部數據; * family為空時, 檢索指定行鍵的全部數據; * </p> * * @param tableName 表名 * @param rowKey 行鍵 * @param family 列族 * @param columns 列名集合 * * @throws IOException */ public static void getData(String tableName, String rowKey, String family, String[] columns) throws IOException { try (Connection connection = ConnectionFactory.createConnection(configuration); Table table = connection.getTable(TableName.valueOf(tableName)) ) { Get get = new Get(Bytes.toBytes(rowKey)); Result result = table.get(get); if (null != family && !"".equals(family)) { if (null != columns && columns.length > 0) { // 表里指定列族的列值 for (String column : columns) { byte[] rb = result.getValue(Bytes.toBytes(family), Bytes.toBytes(column)); System.out.println(Bytes.toString(rb)); } } else { // 指定列族的所有值 Map<byte[], byte[]> columnMap = result.getFamilyMap(Bytes.toBytes(family)); for (Map.Entry<byte[], byte[]> entry : columnMap.entrySet()) { System.out.println(Bytes.toString(entry.getKey()) + " " + Bytes.toString(entry.getValue())); } } } else { // 指定行鍵的所有值 Cell[] cells = result.rawCells(); for (Cell cell : cells) { System.out.println("family => " + Bytes.toString(cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength()) + "\n" + "qualifier => " + Bytes.toString(cell.getQualifierArray(), cell.getQualifierOffset(), cell.getQualifierLength()) + "\n" + "value => " + Bytes.toString(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength())); } } } } # 調用示例 getData("blog", "rk1", null, null); getData("blog", "rk1", "author", null); getData("blog", "rk1", "author", new String[] { "name", "school" });
5. get_counter
獲取計數器的值。
語法:get_counter 'tableName', 'row', 'column' 示例: hbase> get_counter ‘t1’, ‘r1’, ‘c1’ 同樣,也可以在表引用上使用: hbase> t.get_counter ‘r1’, ‘c1’
6. incr
計數器
Shell:
語法:incr 'tableName', 'row', 'column', value 例如:表t1的r1行c1列增加1(可省略),或10: hbase> incr ‘t1’, ‘r1’, ‘c1’ hbase> incr ‘t1’, ‘r1’, ‘c1’, 1 hbase> incr ‘t1’, ‘r1’, ‘c1’, 10 同樣,也可以在表引用上使用 hbase> t.incr ‘r1’, ‘c1’ hbase> t.incr ‘r1’, ‘c1’, 1 hbase> t.incr ‘r1’, ‘c1’, 10
Java實現:
/** * 計數器自增 * * @param tableName 表名 * @param rowKey 行鍵 * @param family 列族 * @param column 列 * @param value 增量 * * @throws IOException */ public static void incr(String tableName, String rowKey, String family, String column, long value) throws IOException { try (Connection connection = ConnectionFactory.createConnection(configuration); Table table = connection.getTable(TableName.valueOf(tableName)) ) { long count = table.incrementColumnValue(Bytes.toBytes(rowKey), Bytes.toBytes(family), Bytes.toBytes(column), value); System.out.println("增量后的值: " + count); } } #調用示例 incr("scores", "lisi", "courses", "eng", 2);
7. put
插入數據。
Shell:
語法:put 'table','rowkey','family:column','value'[,'timestamp'] 例如:插入表t1,行r1,列c1,時間戳ts1 hbase> put ‘t1’, ‘r1’, ‘c1’, ‘value’, ts1 同樣,也可以在表引用上使用 hbase> t.put ‘r1’, ‘c1’, ‘value’, ts1
Java實現:
/** * 插入數據 * * @param tableName 表名 * @param rowKey 行鍵 * @param familys 列族信息(Key: 列族; value: (列名, 列值)) */ public static void putData(String tableName, String rowKey, Map<String, Map<String, String>> familys) throws IOException { try (Connection connection = ConnectionFactory.createConnection(configuration); Table table = connection.getTable(TableName.valueOf(tableName)) ) { Put put = new Put(Bytes.toBytes(rowKey)); for (Map.Entry<String, Map<String, String>> family : familys.entrySet()) { for (Map.Entry<String, String> column : family.getValue().entrySet()) { put.addColumn(Bytes.toBytes(family.getKey()), Bytes.toBytes(column.getKey()), Bytes.toBytes(column.getValue())); } } table.put(put); } } # 調用例 // 行鍵1 Map<String, Map<String, String>> map1 = new HashMap<>(); // 列族author的列值 Map<String, String> author1 = new HashMap<>(); author1.put("name", "張三"); author1.put("school", "MIT"); map1.put("author", author1); // 列族contents的列值 Map<String, String> contents1 = new HashMap<>(); contents1.put("content", "吃飯了嗎?"); map1.put("contents", contents1); putData("blog", "rk1", map1);
8. scan
掃描全表。
語法:scan 'table' [, {COLUMNS => [ 'family:column', .... , LIMIT => num} ]
可以使用以下限定詞:
TIMERANGE, FILTER, LIMIT, STARTROW, STOPROW, TIMESTAMP, MAXLENGTH,
, COLUMNS, CACHE。
如果沒有限定詞,則掃描全表。
列族的列指定為空時,掃描列族中全部數據('col_family:')。
指定過濾條件有兩種方式:
1. 使用過濾字符串 – 詳細見[HBASE-4176 JIRA](https://issues.apache.org/jira/browse/HBASE-4176)
2. 使用過濾器的整個包名稱。
示例如下:
hbase> scan ‘.META.’
hbase> scan ‘.META.’, {COLUMNS => ‘info:regioninfo’}
hbase> scan ‘t1’, {COLUMNS => [‘c1’, ‘c2’], LIMIT => 10, STARTROW => ‘xyz’}
hbase> scan ‘t1’, {COLUMNS => ‘c1’, TIMERANGE => [1303668804, 1303668904]}
hbase> scan ‘t1’, {FILTER => “(PrefixFilter (‘row2’) AND
(QualifierFilter (>=, ‘binary:xyz’))) AND (TimestampsFilter ( 123, 456))”}
hbase> scan ‘t1’, {FILTER =>
org.apache.hadoop.hbase.filter.ColumnPaginationFilter.new(1, 0)}
CACHE_BLOCKS:切換block caching,默認可用。
示例:
hbase> scan ‘t1’, {COLUMNS => [‘c1’, ‘c2’], CACHE_BLOCKS => false}
RAW:掃描返回所有數據 (包括delete markers和uncollected deleted)。
該選項不能和指定COLUMNS共用。默認disable。
示例:
hbase> scan ‘t1’, {RAW => true, VERSIONS => 10}
默認使用toStringBinary格式化,scan支持對列的自定義格式化。
FORMATTER約定:
1. 使用org.apache.hadoop.hbase.util.Bytes的方法(例如toInt, toString);
2. 使用自定義類的方法例如'c(MyFormatterClass).format'。
例如 cf:qualifier1 和 cf:qualifier2:
hbase> scan ‘t1’, {COLUMNS => [‘cf:qualifier1:toInt’,
‘cf:qualifier2:c(org.apache.hadoop.hbase.util.Bytes).toInt’] }
注:只能指定列的FORMATTER,不能指定列族中所有列的FORMATTER。
可以使用表的引用調用該方法:
hbase> t = get_table ‘t’
hbase> t.scan
Java實現:
/** * 全表掃描 * * @param tableName 表名 * * @throws IOException */ public static void scan(String tableName) throws IOException { try (Connection connection = ConnectionFactory.createConnection(configuration); Table table = connection.getTable(TableName.valueOf(tableName)) ) { Scan scan = new Scan(); ResultScanner resultScanner = table.getScanner(scan); for (Result result : resultScanner) { List<Cell> cells = result.listCells(); for (Cell cell : cells) { System.out.println("row => " + Bytes.toString(CellUtil.cloneRow(cell)) + "\n" + "family => " + Bytes.toString(CellUtil.cloneFamily(cell)) + "\n" + "qualifier => " + Bytes.toString(CellUtil.cloneQualifier(cell)) + "\n" + "value => " + Bytes.toString(CellUtil.cloneValue(cell))); } } } } # 調用示例 scan("blog");
9. truncate
無效、刪除並重新創建表。
Shell:
hbase>truncate ‘t1’
- 1
- 1
Java示例:
工具
| 命令 | 說明 |
|---|---|
| assign | 分配region,如果region已經被分配,將強制重新分配。hbase> assign ‘REGION_NAME’ |
| balancer | 觸發集群均衡器。hbase> balancer |
| balance_switch | 切換均衡器。hbase> balance_switch truehbase> balance_switch false |
| close_region | 關閉region。hbase>close_region 'REGIONNAME', 'SERVER_NAME' |
| compact | Compact all regions in a table:hbase> compact ‘t1’Compact an entire region: hbase> compact ‘r1’Compact only a column family within a region: hbase> compact ‘r1’, ‘c1’Compact a column family within a table: hbase> compact ‘t1’, ‘c1’ |
| flush | Flush all regions in passed table or pass a region row to flush an individual region. For example: hbase> flush ‘TABLENAME’hbase> flush ‘REGIONNAME’ |
| major_compact | Compact all regions in a table:hbase> major_compact ‘t1’Compact an entire region: hbase> major_compact ‘r1’Compact a single column family within a region: hbase> major_compact ‘r1’, ‘c1’Compact a single column family within a table: hbase> major_compact ‘t1’, ‘c1’ |
| move | 隨機移動到某region serverhbase> move ‘ENCODED_REGIONNAME’移動region到指定的server hbase>move 'ENCODED_REGIONNAME', 'SERVER_NAME' |
| split | Split entire table or pass a region to split individual region. With the second parameter, you can specify an explicit split key for the region. Examples: split ‘tableName’split ‘regionName’ # format: ‘tableName,startKey,id’split ‘tableName’, ‘splitKey’split ‘regionName’, ‘splitKey’ |
| unassign | Unassign a region. Unassign will close region in current location and then reopen it again. Pass ‘true’ to force the unassignment (‘force’ will clear all in-memory state in master before the reassign. If results in double assignment use hbck -fix to resolve. To be used by experts). Use with caution. For expert use only. Examples: hbase> unassign ‘REGIONNAME’hbase> unassign ‘REGIONNAME’, true |
| hlog_roll | Roll the log writer. That is, start writing log messages to a new file. The name of the regionserver should be given as the parameter. A ‘server_name’ is the host, port plus startcode of a regionserver. For example: host187.example.com,60020,1289493121758 (find servername in master ui or when you do detailed status in shell) hbase>hlog_roll |
| zk_dump | Dump status of HBase cluster as seen by ZooKeeper. Example:hbase>zk_dump |
集群復制
| 命令 | 說明 |
|---|---|
| add_peer | Add a peer cluster to replicate to, the id must be a short and the cluster key is composed like this: hbase.zookeeper.quorum:hbase.zookeeper.property.clientPort:zookeeper.znode.parent This gives a full path for HBase to connect to another cluster.Examples: hbase>add_peer ‘1’, “server1.cie.com:2181:/hbase”hbase>add_peer ‘2’, “zk1,zk2,zk3:2182:/hbase-prod” |
| remove_peer | Stops the specified replication stream and deletes all the meta information kept about it. Examples:hbase> remove_peer ‘1’ |
| list_peers | List all replication peer clusters.hbase> list_peers |
| enable_peer | Restarts the replication to the specified peer cluster, continuing from where it was disabled. Examples:hbase> enable_peer ‘1’ |
| disable_peer | Stops the replication stream to the specified cluster, but still keeps track of new edits to replicate.Examples: hbase> disable_peer ‘1’ |
| start_replication | Restarts all the replication features. The state in which each stream starts in is undetermined. WARNING: start/stop replication is only meant to be used in critical load situations. Examples: hbase> start_replication |
| stop_replication | Stops all the replication features. The state in which each stream stops in is undetermined. WARNING: start/stop replication is only meant to be used in critical load situations. Examples: hbase> stop_replication |
權限控制
| 命令 | 說明 |
|---|---|
| grant | 授予用戶指定權限. 語法:集合’RWXCA’中任意個字符。 READ(‘R’) WRITE(‘W’) EXEC(‘X’) CREATE(‘C’) ADMIN(‘A’) 例如: hbase> grant ‘bobsmith’, ‘RWXCA’hbase> grant ‘bobsmith’, ‘RW’, ‘t1’, ‘f1’, ‘col1’ |
| revoke | 移除用戶權限。 語法:revoke hbase> revoke ‘bobsmith’, ‘t1’, ‘f1’, ‘col1’ |
| user_permission | 顯示用戶權限。 語法:user_permission ‘table’ hbase> user_permission ‘table1’ |
