org.elasticsearch.action.admin.indices.alias.get.GetAliasesResponse Java Examples

private Table buildTable(RestRequest request, GetAliasesResponse response) {
    Table table = getTableWithHeader(request);

    for (ObjectObjectCursor<String, List<AliasMetaData>> cursor : response.getAliases()) {
        String indexName = cursor.key;
        for (AliasMetaData aliasMetaData : cursor.value) {
            table.startRow();
            table.addCell(aliasMetaData.alias());
            table.addCell(indexName);
            table.addCell(aliasMetaData.filteringRequired() ? "*" : "-");
            String indexRouting = Strings.hasLength(aliasMetaData.indexRouting()) ? aliasMetaData.indexRouting() : "-";
            table.addCell(indexRouting);
            String searchRouting = Strings.hasLength(aliasMetaData.searchRouting()) ? aliasMetaData.searchRouting() : "-";
            table.addCell(searchRouting);
            table.endRow();
        }
    }

    return table;
}
 

/**
     * 索引 别名 就像一个快捷方式或软连接，可以指向一个或多个索引，也可以给任何需要索引名的 API 使用。别名带给我们极大的灵活性，
     * 比如 我们线上使用一个索引名为index_a的结构，里面有一个类型现在不满足要求，现在需要修改，因为elasticsearch不支持直接修改类型，所以我们必须要重新建立一个新的索引
     * 然后将久索引的数据拷贝过去。 但是如果让新的索引起作用，我们需要要修改引用代码，因为索引名称更换了，但是如果我们一开始创建索引的时候就给索引增加一个别名
     * 使用的时候都是使用index_alis 无论软连接的指向是什么索引，对外暴露的始终都是index_alis
     * @param indicesAdminClient
     */
    private static void createAliasIndex(IndicesAdminClient indicesAdminClient) {
//        1 创建索引 elsdb_alis_v1。
//        2 将别名 elsdb_alis 指向 elsdb_alis_v1
//        3 然后，我们决定修改索引elsdb_alis_v1中一个字段的映射。当然我们不能修改现存的映射，索引我们需要重新索引数据。首先，我们创建有新的映射的索引 elsdb_alis_v2。
//        4 然后我们从将数据从 elsdb_alis_v1 迁移到 elsdb_alis_v2，下面的过程在【重新索引】中描述过了。一旦我们认为数据已经被正确的索引了，我们就将别名指向新的索引。


        //创建索引
        if (checkExistsIndex(indicesAdminClient, INDEX_ALIAS_NAME_VERSION_ONE)) {
            deleteIndex(indicesAdminClient, INDEX_ALIAS_NAME_VERSION_ONE);
        }

        indicesAdminClient.prepareCreate(INDEX_ALIAS_NAME_VERSION_ONE).setSettings().execute().actionGet();
        //添加alias 所有别名
        indicesAdminClient.prepareAliases().addAlias(INDEX_ALIAS_NAME_VERSION_ONE,INDEX_ALIAS_NAME_ALIS).execute().actionGet();

        GetAliasesResponse getAliasesResponse = indicesAdminClient.getAliases(new GetAliasesRequest().indices(INDEX_ALIAS_NAME_ALIS)).actionGet();
        //log.info("getAliasesResponse index setting:{}", getAliasesResponse.getAliases());

        indicesAdminClient.prepareAliases().removeAlias(INDEX_ALIAS_NAME_VERSION_ONE,INDEX_ALIAS_NAME_ALIS).addAlias(INDEX_ALIAS_NAME_VERSION_TWO,INDEX_ALIAS_NAME_ALIS);
    }
 

public String resolveMostRecentIndex(String alias) {
    if (client() == null) {
        return alias;
    }
    if (alias == null) {
        return null;
    }
    GetAliasesRequestBuilder getAliasesRequestBuilder = new GetAliasesRequestBuilder(client(), GetAliasesAction.INSTANCE);
    GetAliasesResponse getAliasesResponse = getAliasesRequestBuilder.setAliases(alias).execute().actionGet();
    Pattern pattern = Pattern.compile("^(.*?)(\\d+)$");
    Set<String> indices = new TreeSet<>(Collections.reverseOrder());
    for (ObjectCursor<String> indexName : getAliasesResponse.getAliases().keys()) {
        Matcher m = pattern.matcher(indexName.value);
        if (m.matches()) {
            if (alias.equals(m.group(1))) {
                indices.add(indexName.value);
            }
        }
    }
    return indices.isEmpty() ? alias : indices.iterator().next();
}
 

@Override
public void handleRequest(final RestRequest request, final RestChannel channel, final Client client) {
    final String[] aliases = request.paramAsStringArrayOrEmptyIfAll("name");
    final String[] indices = Strings.splitStringByCommaToArray(request.param("index"));
    final GetAliasesRequest getAliasesRequest = new GetAliasesRequest(aliases);
    getAliasesRequest.indices(indices);
    getAliasesRequest.indicesOptions(IndicesOptions.fromRequest(request, getAliasesRequest.indicesOptions()));
    getAliasesRequest.local(request.paramAsBoolean("local", getAliasesRequest.local()));

    client.admin().indices().getAliases(getAliasesRequest, new RestBuilderListener<GetAliasesResponse>(channel) {
        @Override
        public RestResponse buildResponse(GetAliasesResponse response, XContentBuilder builder) throws Exception {
            // empty body, if indices were specified but no aliases were
            if (indices.length > 0 && response.getAliases().isEmpty()) {
                return new BytesRestResponse(OK, builder.startObject().endObject());
            } else if (response.getAliases().isEmpty()) {
                String message = String.format(Locale.ROOT, "alias [%s] missing", toNamesString(getAliasesRequest.aliases()));
                builder.startObject()
                        .field("error", message)
                        .field("status", RestStatus.NOT_FOUND.getStatus())
                        .endObject();
                return new BytesRestResponse(RestStatus.NOT_FOUND, builder);
            }

            builder.startObject();
            for (ObjectObjectCursor<String, List<AliasMetaData>> entry : response.getAliases()) {
                builder.startObject(entry.key, XContentBuilder.FieldCaseConversion.NONE);
                builder.startObject(Fields.ALIASES);
                for (AliasMetaData alias : entry.value) {
                    AliasMetaData.Builder.toXContent(alias, builder, ToXContent.EMPTY_PARAMS);
                }
                builder.endObject();
                builder.endObject();
            }
            builder.endObject();
            return new BytesRestResponse(OK, builder);
        }
    });
}
 

@Override
protected void doRequest(final RestRequest request, final RestChannel channel, final Client client) {
    final GetAliasesRequest getAliasesRequest = request.hasParam("alias") ?
            new GetAliasesRequest(request.param("alias")) :
            new GetAliasesRequest();
    getAliasesRequest.local(request.paramAsBoolean("local", getAliasesRequest.local()));

    client.admin().indices().getAliases(getAliasesRequest, new RestResponseListener<GetAliasesResponse>(channel) {
        @Override
        public RestResponse buildResponse(GetAliasesResponse response) throws Exception {
            Table tab = buildTable(request, response);
            return RestTable.buildResponse(tab, channel);
        }
    });
}
 

public String resolveAlias(String alias) {
    if (client() == null) {
        return alias;
    }
    GetAliasesRequestBuilder getAliasesRequestBuilder = new GetAliasesRequestBuilder(client(), GetAliasesAction.INSTANCE);
    GetAliasesResponse getAliasesResponse = getAliasesRequestBuilder.setAliases(alias).execute().actionGet();
    if (!getAliasesResponse.getAliases().isEmpty()) {
        return getAliasesResponse.getAliases().keys().iterator().next().value;
    }
    return alias;
}
 

private Map<String,String> getFilters(GetAliasesResponse getAliasesResponse) {
    Map<String,String> result = new HashMap<>();
    for (ObjectObjectCursor<String, List<AliasMetaData>> object : getAliasesResponse.getAliases()) {
        List<AliasMetaData> aliasMetaDataList = object.value;
        for (AliasMetaData aliasMetaData : aliasMetaDataList) {
            if (aliasMetaData.filteringRequired()) {
                result.put(aliasMetaData.alias(), new String(aliasMetaData.getFilter().uncompressed()));
            } else {
                result.put(aliasMetaData.alias(), null);
            }
        }
    }
    return result;
}
 

@Override
public ActionFuture<GetAliasesResponse> getAliases(GetAliasesRequest request) {
    return execute(GetAliasesAction.INSTANCE, request);
}
 

@Override
public void getAliases(GetAliasesRequest request, ActionListener<GetAliasesResponse> listener) {
    execute(GetAliasesAction.INSTANCE, request, listener);
}
 

public GetAliasesResponse getAlias(final String alias) {
    return getAlias(alias, builder -> builder);
}
 

public GetAliasesResponse getAlias(final String alias, final BuilderCallback<GetAliasesRequestBuilder> builder) {
    return builder.apply(client().admin().indices().prepareGetAliases(alias)).execute().actionGet();
}
 

/**
 * Get specific index aliases that exists in particular indices and / or by name.
 *
 * @param request The result future
 */
ActionFuture<GetAliasesResponse> getAliases(GetAliasesRequest request);
 

/**
 * Get specific index aliases that exists in particular indices and / or by name.
 *
 * @param request  The index aliases request
 * @param listener A listener to be notified with a result
 */
void getAliases(GetAliasesRequest request, ActionListener<GetAliasesResponse> listener);