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- Generate eccrhonos_Id that should be unique (uuid + host name) - on start up instance, first check nodes_metadata table for ecchronosId, if it already exists, use that one, otherwise generate now one. - So due to persistence of eccronosId, it would be same even instance get reinstalled or restart. - when instance try to acquire nodes then add this newly ecchronosId into nodes_metadata table with datacenter and nodeId. - The new table nodes_metadata schenma, datacenter is partition key and nodeId is clustering colum and ecchrons_id coulum would hold the Id.
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sajid riaz
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Sep 19, 2024
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data/src/main/java/com/ericsson/bss/cassandra/ecchronos/data/sync/EccNodeMetadata.java
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| /* | ||
| * Copyright 2024 Telefonaktiebolaget LM Ericsson | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.ericsson.bss.cassandra.ecchronos.data.sync; | ||
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|
||
| import com.datastax.oss.driver.api.core.ConsistencyLevel; | ||
| import com.datastax.oss.driver.api.core.CqlSession; | ||
| import com.datastax.oss.driver.api.core.cql.BoundStatement; | ||
| import com.datastax.oss.driver.api.core.cql.PreparedStatement; | ||
| import com.datastax.oss.driver.api.core.cql.ResultSet; | ||
| import com.datastax.oss.driver.api.core.cql.Row; | ||
| import com.datastax.oss.driver.api.core.metadata.Node; | ||
| import com.datastax.oss.driver.api.querybuilder.QueryBuilder; | ||
| import java.net.InetAddress; | ||
| import java.net.UnknownHostException; | ||
| import java.util.List; | ||
| import java.util.UUID; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import static com.datastax.oss.driver.api.querybuilder.QueryBuilder.bindMarker; | ||
| import static com.datastax.oss.driver.api.querybuilder.QueryBuilder.selectFrom; | ||
|
|
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| public final class EccNodeMetadata | ||
| { | ||
|
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| private static final Logger LOG = LoggerFactory.getLogger(EccNodeMetadata.class); | ||
| private static final String COLUMN_ECCHRONOS_ID = "ecchronos_id"; | ||
| private static final String COLUMN_DC_NAME = "datacenter_name"; | ||
| private static final String COLUMN_NODE_ID = "node_id"; | ||
| private static final String KEYSPACE_NAME = "ecchronos"; | ||
| private static final String NODE_METADATA_TABLE_NAME = "nodes_metadata"; | ||
|
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| private final PreparedStatement mySelectStatement; | ||
| private final PreparedStatement myCreateStatement; | ||
| private final PreparedStatement myTableUpdateStatement; | ||
| private final CqlSession mySession; | ||
| private final Node myNode; | ||
|
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| public EccNodeMetadata(final List<Node> nodes, final CqlSession session) | ||
| { | ||
| mySession = session; | ||
| myNode = nodes.stream().findAny().get(); | ||
| myCreateStatement = mySession.prepare(QueryBuilder.insertInto(KEYSPACE_NAME, NODE_METADATA_TABLE_NAME) | ||
| .value(COLUMN_DC_NAME, bindMarker()) | ||
| .value(COLUMN_NODE_ID, bindMarker()) | ||
| .value(COLUMN_ECCHRONOS_ID, bindMarker()) | ||
| .build()); | ||
| myTableUpdateStatement = mySession.prepare(QueryBuilder.update(KEYSPACE_NAME, NODE_METADATA_TABLE_NAME) | ||
| .setColumn(COLUMN_ECCHRONOS_ID, bindMarker()) | ||
| .whereColumn(COLUMN_DC_NAME) | ||
| .isEqualTo(bindMarker()) | ||
| .whereColumn(COLUMN_NODE_ID) | ||
| .isEqualTo(bindMarker()) | ||
| .build() | ||
| .setConsistencyLevel(ConsistencyLevel.LOCAL_QUORUM)); | ||
| mySelectStatement = mySession.prepare(selectFrom(KEYSPACE_NAME, NODE_METADATA_TABLE_NAME) | ||
| .columns(COLUMN_ECCHRONOS_ID) | ||
| .whereColumn(COLUMN_DC_NAME) | ||
| .isEqualTo(bindMarker()) | ||
| .build()); | ||
| } | ||
|
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| public String getEccChronosID() throws UnknownHostException | ||
| { | ||
| ResultSet resultSet = getResultSet(); | ||
|
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| Row row = resultSet.one(); | ||
| if (row != null) | ||
| { | ||
| return row.getString(COLUMN_ECCHRONOS_ID); | ||
| } | ||
| return generateNewEcChronosID(); | ||
| } | ||
|
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||
| public ResultSet getResultSet() | ||
| { | ||
| BoundStatement boundStatement = mySelectStatement.bind(myNode.getDatacenter()); | ||
| return mySession.execute(boundStatement); | ||
| } | ||
|
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| public ResultSet insertNodeMetadataInfo(final String datacenterName, | ||
| final UUID nodeID, | ||
| final String eccChronosID) | ||
| { | ||
| BoundStatement insertMetadataInfo = myCreateStatement.bind(datacenterName, nodeID, eccChronosID); | ||
| ResultSet tmpResultSet = mySession.execute(insertMetadataInfo); | ||
| LOG.info("Preparing to insert node metadata with Datacenter {}, NodeId {} and EccChronosID {}", | ||
| datacenterName, nodeID, eccChronosID); | ||
| if (tmpResultSet.wasApplied()) | ||
| { | ||
| LOG.info("Node metadata info successfully stored with EccChronosID {}", eccChronosID); | ||
| } | ||
| else | ||
| { | ||
| LOG.error("Unable to store metadata info with NodeId{}", nodeID); | ||
| } | ||
| return tmpResultSet; | ||
| } | ||
|
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| public ResultSet updateNodeMetadataEcChronosIdStatement(final String ecChronosId, | ||
| final String datacenterName, | ||
| final UUID nodeID) | ||
| { | ||
| BoundStatement updateEcChronosID = myTableUpdateStatement.bind(ecChronosId, datacenterName, nodeID); | ||
| ResultSet tmpResultSet = mySession.execute(updateEcChronosID); | ||
| if (tmpResultSet.wasApplied()) | ||
| { | ||
| LOG.info("Node metadata {} successfully updated", nodeID); | ||
| } | ||
| else | ||
| { | ||
| LOG.error("Unable to update node metadata {}", nodeID); | ||
| } | ||
| return tmpResultSet; | ||
| } | ||
|
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| private String generateNewEcChronosID() throws UnknownHostException | ||
| { | ||
| String uuid = UUID.randomUUID().toString(); | ||
| return uuid.concat(InetAddress.getLocalHost().getHostName()); | ||
| } | ||
| } |
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