更改 Cassandra 压缩策略

Apigee 使用 Cassandra 数据库来存储大部分数据，包括代理、缓存和令牌的数据。 压缩是一种用于减小数据库中存储的数据大小的标准过程，这对于保持数据库高效运行至关重要。Cassandra 支持各种压缩策略。Apigee 建议所有适用于 Private Cloud 的 Edge 客户对所有列族都使用策略 LeveledCompactionStrategy（而不是默认策略 SizeTieredCompactionStrategy）来运行其 Cassandra 集群。与 SizedTieredCompactionStrategy 相比，LeveledCompactionStrategy 可提供更高的性能、更高的磁盘利用率和更高效的压缩，并且需要的可用空间更少。

所有新安装的 Apigee 4.51.00 或更高版本都将自动使用 LeveledCompactionStrategy 设置 Cassandra。但是，如果您使用的是旧版本的 Apigee 或者已从旧版本升级到 Apigee 4.51.00，则您的版本可能仍在将 Cassandra 与 SizeTieredCompactionStrategy 搭配使用。如需了解您的 Cassandra 版本使用的是哪种压缩策略，请参阅检查压缩策略部分。

本页面介绍如何将压缩策略更改为 LeveledCompactionStrategy。

准备

检查现有的压缩策略

如需查看列族的现有压缩策略，请按照检查压缩策略中的说明操作。如果压缩策略已处于 LeveledCompactionStrategy 状态，则无需按照本页面上的其余说明操作。

备份

由于更改压缩策略会在 C* 节点中触发完整的压缩周期，因此可能会因压缩负载和同时应用流量而引入一些延迟。如需从备份中恢复 Cassandra 节点，可能需要回滚此更改。 请参阅如何备份，了解如何在更改压缩策略之前备份数据。

压缩吞吐量

将压缩策略更改为 LeveledCompactionStrategy 后，压缩可能会运行很长时间。根据数据压缩的大小，运行时可能会有所不同。在压缩周期内，Cassandra 可能会消耗更多系统资源。为确保压缩不会占用大量系统资源（可能会中断 API 运行时请求），我们建议设置压缩吞吐量限制。

在每个节点上运行以下 nodetool 命令，将所有 C* 节点上的压缩吞吐量设置为不超过 128 MB：

nodetool setcompactionthroughput 128

调整虚拟机大小以进行压缩

在执行此更改之前，请确保 C* 节点有足够的 CPU/内存资源。在执行此更改之前，请确保 C* 节点的 CPU 负载不超过 25%。

压缩策略更改后，预计会运行完整的压缩周期，因此建议在低流量期间更改压缩策略。

交错运行

您可能无法在一天内完成所有节点的更改，尤其是在您运行大型 Cassandra 集群时，因为索引需要在每个节点上逐一重新构建。您一次可以更改一个架构或一个列族（表）的压缩策略。为此，请更改列族以更改其压缩策略，然后在所有节点上重新构建表上的所有索引（如果有）。然后对每个表或键空间重复上述过程。针对一个表或一个键空间的此类运行可分解为在不同的日期运行。

例如，如需更改 kms 架构中 oauth_20_access_tokens 列族的压缩策略，您可以执行以下操作：

  1. 修改表以更改压缩策略： 
       
ALTER TABLE kms.oauth_20_access_tokens WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  2. 仅重新构建此表的所有索引：
    nodetool rebuild_index kms oauth_20_access_tokens oauth_20_access_tokens_app_id_idx
nodetool rebuild_index kms oauth_20_access_tokens oauth_20_access_tokens_client_id_idx
nodetool rebuild_index kms oauth_20_access_tokens oauth_20_access_tokens_refresh_token_idx

更改压缩策略

概括来讲，更改压缩策略的过程分为两个步骤：

  1. 修改每个表的压缩策略。
  2. 逐个重新构建每个节点上的所有索引。

修改表以设置新的压缩策略

在任何一个 Cassandra 节点上运行以下 Cassandra 查询语言 (CQL) 命令，一次更改一个键空间的策略。您可以在 cql 提示符处运行 CQL。如需调用 cql 提示符，请执行以下操作：

/opt/apigee/apigee-cassandra/bin/cqlsh `hostname -i`

您将看到如下所示的响应：

Connected to apigee at XX.XX.XX.XX:9042.
[cqlsh 5.0.1 | Cassandra 2.1.16 | CQL spec 3.2.1 | Native
protocol v3]
Use HELP for help.
cqlsh>

运行以下 CQL 以更改压缩策略：

  • 用于更改键空间 kms 的压缩策略的 CQL： 
    ALTER TABLE kms.organizations WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.maps WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.apps WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.app_credentials WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.api_products WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.apiproducts_appslist WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.api_resources WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.app_end_user WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.oauth_20_authorization_codes WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.oauth_20_access_tokens WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.oauth_10_request_tokens WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.oauth_10_access_tokens WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.oauth_10_verifiers WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE kms.app_enduser_tokens WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 user_settings 的压缩策略的 CQL： 
    ALTER TABLE user_settings.user_settings WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 keyvaluemap 的压缩策略的 CQL： 
       
ALTER TABLE keyvaluemap.keyvaluemaps_r21 WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 devconnect 的压缩策略的 CQL： 
        
ALTER TABLE devconnect.developers WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE devconnect.companies WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE devconnect.company_developers WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 counter 的压缩策略的 CQL： 
    ALTER TABLE counter.counters_current_version WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE counter.counters_with_expiry WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE counter.counters WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE counter.key_timestamp_count WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE counter.timestamp_key WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE counter.period_timestamp WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE counter.gateway_quota WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 cache 的压缩策略的 CQL： 
    ALTER TABLE cache.cache_entries WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE cache.cache_sequence_id_r24 WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 ax_custom_report_model 的压缩策略的 CQL： 
    ALTER TABLE ax_custom_report_model.report_description WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE ax_custom_report_model.report_id_lookup WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE ax_custom_report_model.org_metadata WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE ax_custom_report_model.org_report_lookup WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE ax_custom_report_model.report_created_view WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE ax_custom_report_model.report_viewed_view WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 auth 的压缩策略的 CQL： 
    ALTER TABLE auth.totp WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 audit 的压缩策略的 CQL： 
    ALTER TABLE audit.audits WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE audit.audits_ref WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 apprepo 的压缩策略的 CQL： 
    ALTER TABLE apprepo.organizations WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apprepo.environments WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apprepo.apiproxies WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apprepo.apiproxy_revisions WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apprepo.api_proxy_revisions_r21 WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 apimodel 的压缩策略的 CQL： 
    ALTER TABLE apimodel.apis WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.apis_revision WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.resource WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.method WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.revision_counters WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.template_counters WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.template WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.credentials WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.credentialsv2 WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.schemas WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.security WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE apimodel.template_auth WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 identityzone 的压缩策略的 CQL： 
    ALTER TABLE identityzone.IdentityZones WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE identityzone.OrgToIdentityZone WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 dek 的压缩策略的 CQL： 
    ALTER TABLE dek.keys WITH compaction = {'class' : 'LeveledCompactionStrategy'};
  • 用于更改键空间 analytics 的压缩策略的 CQL： 
    ALTER TABLE analytics.custom_aggregates_defn WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE analytics.custom_rules_defn WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE analytics.custom_aggregates_defn_updates WITH compaction = {'class' : 'LeveledCompactionStrategy'};
ALTER TABLE analytics.custom_rules_defn_updates WITH compaction = {'class' : 'LeveledCompactionStrategy'};

重新构建索引

您需要在压缩策略更改后执行此步骤。在每个 Cassandra 节点上逐个运行以下 nodetool 命令。

运行以下 nodetool 命令以重新构建索引：

  • 为键空间 kms 重新构建索引： 
    nodetool rebuild_index kms maps maps_organization_name_idx
nodetool rebuild_index kms apps apps_app_family_idx
nodetool rebuild_index kms apps apps_app_id_idx
nodetool rebuild_index kms apps apps_app_type_idx
nodetool rebuild_index kms apps apps_name_idx
nodetool rebuild_index kms apps apps_organization_name_idx
nodetool rebuild_index kms apps apps_parent_id_idx
nodetool rebuild_index kms apps apps_parent_status_idx
nodetool rebuild_index kms apps apps_status_idx
nodetool rebuild_index kms app_credentials app_credentials_api_products_idx
nodetool rebuild_index kms app_credentials app_credentials_organization_app_id_idx
nodetool rebuild_index kms app_credentials app_credentials_organization_name_idx
nodetool rebuild_index kms api_products api_products_organization_name_idx
nodetool rebuild_index kms app_end_user app_end_user_app_id_idx
nodetool rebuild_index kms oauth_20_authorization_codes oauth_20_authorization_codes_client_id_idx
nodetool rebuild_index kms oauth_20_authorization_codes oauth_20_authorization_codes_organization_name_idx
nodetool rebuild_index kms oauth_20_access_tokens oauth_20_access_tokens_app_id_idx
nodetool rebuild_index kms oauth_20_access_tokens oauth_20_access_tokens_client_id_idx
nodetool rebuild_index kms oauth_20_access_tokens oauth_20_access_tokens_refresh_token_idx
nodetool rebuild_index kms oauth_10_request_tokens oauth_10_request_tokens_consumer_key_idx
nodetool rebuild_index kms oauth_10_request_tokens oauth_10_request_tokens_organization_name_idx
nodetool rebuild_index kms oauth_10_access_tokens oauth_10_access_tokens_app_id_idx
nodetool rebuild_index kms oauth_10_access_tokens oauth_10_access_tokens_consumer_key_idx
nodetool rebuild_index kms oauth_10_access_tokens oauth_10_access_tokens_organization_name_idx
nodetool rebuild_index kms oauth_10_access_tokens oauth_10_access_tokens_status_idx
nodetool rebuild_index kms oauth_10_verifiers oauth_10_verifiers_organization_name_idx
nodetool rebuild_index kms oauth_10_verifiers oauth_10_verifiers_request_token_idx
  • 为键空间 devconnect 重新构建索引： 
    nodetool rebuild_index devconnect companies companies_name_idx
nodetool rebuild_index devconnect companies companies_organization_name_idx
nodetool rebuild_index devconnect companies companies_status_idx
nodetool rebuild_index devconnect company_developers company_developers_company_name_idx
nodetool rebuild_index devconnect company_developers company_developers_developer_email_idx
nodetool rebuild_index devconnect company_developers company_developers_organization_name_idx
nodetool rebuild_index devconnect developers developers_email_idx
nodetool rebuild_index devconnect developers developers_organization_name_idx
nodetool rebuild_index devconnect developers developers_status_idx
  • 为键空间 cache 重新构建索引： 
        
nodetool rebuild_index cache cache_entries cache_entries_cache_name_idx
  • 为键空间 audit 重新构建索引： 
    nodetool rebuild_index audit audits audits_operation_idx
nodetool rebuild_index audit audits audits_requesturi_idx
nodetool rebuild_index audit audits audits_responsecode_idx
nodetool rebuild_index audit audits audits_timestamp_idx
nodetool rebuild_index audit audits audits_user_idx
  • 为键空间 apprepo 重新构建索引： 
    nodetool rebuild_index apprepo environments environments_organization_name_idx
  • 为键空间 apimodel 重新构建索引： 
    nodetool rebuild_index apimodel apis a_name
nodetool rebuild_index apimodel apis a_org_name
nodetool rebuild_index apimodel apis_revision ar_a_name
nodetool rebuild_index apimodel apis_revision ar_a_uuid
nodetool rebuild_index apimodel apis_revision ar_base_url
nodetool rebuild_index apimodel apis_revision ar_is_active
nodetool rebuild_index apimodel apis_revision ar_is_latest
nodetool rebuild_index apimodel apis_revision ar_org_name
nodetool rebuild_index apimodel apis_revision ar_rel_ver
nodetool rebuild_index apimodel apis_revision ar_rev_num
nodetool rebuild_index apimodel resource r_a_name
nodetool rebuild_index apimodel resource r_api_uuid
nodetool rebuild_index apimodel resource r_ar_uuid
nodetool rebuild_index apimodel resource r_base_url
nodetool rebuild_index apimodel resource r_name
nodetool rebuild_index apimodel resource r_org_name
nodetool rebuild_index apimodel resource r_res_path
nodetool rebuild_index apimodel resource r_rev_num
nodetool rebuild_index apimodel method m_a_name
nodetool rebuild_index apimodel method m_api_uuid
nodetool rebuild_index apimodel method m_ar_uuid
nodetool rebuild_index apimodel method m_base_url
nodetool rebuild_index apimodel method m_name
nodetool rebuild_index apimodel method m_org_name
nodetool rebuild_index apimodel method m_r_name
nodetool rebuild_index apimodel method m_r_uuid
nodetool rebuild_index apimodel method m_res_path
nodetool rebuild_index apimodel method m_rev_num
nodetool rebuild_index apimodel method m_verb
nodetool rebuild_index apimodel template t_a_name
nodetool rebuild_index apimodel template t_a_uuid
nodetool rebuild_index apimodel template t_entity
nodetool rebuild_index apimodel template t_name
nodetool rebuild_index apimodel template t_org_name
nodetool rebuild_index apimodel schemas s_api_uuid
nodetool rebuild_index apimodel schemas s_ar_uuid
nodetool rebuild_index apimodel security sa_api_uuid
nodetool rebuild_index apimodel security sa_ar_uuid
nodetool rebuild_index apimodel template_auth au_api_uuid
  • 为键空间 dek 重新构建索引： 
    nodetool rebuild_index dek keys usecase_index

验证

  1. 按照检查压缩策略中的说明，检查对架构的压缩策略更改是否已生效。
  2. 验证在策略更改后是否已成功运行压缩以及数据是否压缩：
    1. 在每个 Cassandra 节点上，运行以下 nodetool 命令以查看所有压缩是否已完成，以及没有待处理的内容：
      nodetool compactionstats
    2. 使用上述命令完成验证后，确保没有待处理的压缩，请检查数据文件的上次修改时间戳（在 /opt/apigee/data/apigee-cassandra/data/ 下），晚于执行压缩策略更改 CQL 的时间戳。

回滚

如果需要回滚，可以采用以下选项之一：

方法 1：还原更改

将压缩策略回滚到 SizeTieredCompactionStrategy。

在任何一个 Cassandra 节点更改策略（一次一个键空间）上运行以下 CQL。您可以在 cql 提示符处运行 CQL。如需调用 cql 提示，请执行以下操作：

/opt/apigee/apigee-cassandra/bin/cqlsh `hostname -i`

您将看到如下所示的响应：

Connected to apigee at XX.XX.XX.XX:9042.
[cqlsh 5.0.1 | Cassandra 2.1.16 | CQL spec 3.2.1 | Native
protocol v3]
Use HELP for help.
cqlsh>

运行以下 CQL 以更改压缩策略：

  • 用于更改键空间 kms 的压缩策略的 CQL： 
    ALTER TABLE kms.organizations WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.maps WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.apps WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.app_credentials WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.api_products WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.apiproducts_appslist WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.api_resources WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.app_end_user WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.oauth_20_authorization_codes WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.oauth_20_access_tokens WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.oauth_10_request_tokens WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.oauth_10_access_tokens WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.oauth_10_verifiers WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE kms.app_enduser_tokens WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 user_settings 的压缩策略的 CQL： 
    ALTER TABLE user_settings.user_settings WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 keyvaluemap 的压缩策略的 CQL： 
    ALTER TABLE keyvaluemap.keyvaluemaps_r21 WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 devconnect 的压缩策略的 CQL： 
    ALTER TABLE devconnect.developers WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE devconnect.companies WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE devconnect.company_developers WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 counter 的压缩策略的 CQL： 
    ALTER TABLE counter.counters_current_version WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE counter.counters_with_expiry WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE counter.counters WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE counter.key_timestamp_count WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE counter.timestamp_key WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE counter.period_timestamp WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE counter.gateway_quota WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 cache 的压缩策略的 CQL： 
    ALTER TABLE cache.cache_entries WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE cache.cache_sequence_id_r24 WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 ax_custom_report_model 的压缩策略的 CQL： 
    ALTER TABLE ax_custom_report_model.report_description WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE ax_custom_report_model.report_id_lookup WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE ax_custom_report_model.org_metadata WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE ax_custom_report_model.org_report_lookup WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE ax_custom_report_model.report_created_view WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE ax_custom_report_model.report_viewed_view WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 auth 的压缩策略的 CQL： 
    ALTER TABLE auth.totp WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 audit 的压缩策略的 CQL： 
    ALTER TABLE audit.audits WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE audit.audits_ref WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 apprepo 的压缩策略的 CQL： 
    ALTER TABLE apprepo.organizations WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apprepo.environments WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apprepo.apiproxies WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apprepo.apiproxy_revisions WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apprepo.api_proxy_revisions_r21 WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 apimodel 的压缩策略的 CQL： 
    ALTER TABLE apimodel.apis WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.apis_revision WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.resource WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.method WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.revision_counters WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.template_counters WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.template WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.credentials WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.credentialsv2 WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.schemas WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.security WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE apimodel.template_auth WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 identityzone 的压缩策略的 CQL： 
    ALTER TABLE identityzone.IdentityZones WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE identityzone.OrgToIdentityZone WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 dek 的压缩策略的 CQL： 
        
ALTER TABLE dek.keys WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
  • 用于更改键空间 analytics 的压缩策略的 CQL： 
    ALTER TABLE analytics.custom_aggregates_defn WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE analytics.custom_rules_defn WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE analytics.custom_aggregates_defn_updates WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};
ALTER TABLE analytics.custom_rules_defn_updates WITH compaction = {'class' : 'SizeTieredCompactionStrategy'};

更改所有列族后，如果您已在将压缩策略更改为 LeveledCompactionStrategy 时重新构建了索引，则需要再次重新构建索引。按照与上文相同的步骤来重新构建所有索引。如果您之前没有重新构建索引，则在回滚期间不需要重新构建索引。

方法 2 - 通过备份恢复完整数据

如需执行完整的数据恢复，请参阅从备份恢复中的说明。

检查压缩策略

在 Cassandra 中，压缩策略是在列族（表）级别设置的。您可以使用下面的 CQL 查询来检查每个列族的压缩策略。

您可以在 cql 提示符处运行 CQL。如需调用 cql 提示，请执行以下操作：

/opt/apigee/apigee-cassandra/bin/cqlsh `hostname -i`

您将看到如下所示的响应：

Connected to apigee at XX.XX.XX.XX:9042.
[cqlsh 5.0.1 | Cassandra 2.1.16 | CQL spec 3.2.1 | Native
protocol v3]
Use HELP for help.
cqlsh>

您可以按如下方式确定当前的压缩策略：

  • 如果压缩策略设置为 SizeTieredCompactionStrategy，则以下查询的输出将为 org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy。
  • 如果压缩策略设置为 LeveledCompactionStrategy，则以下查询的输出将为 org.apache.cassandra.db.compaction.LeveledCompactionStrategy。

运行以下 CQL 以验证压缩策略：

  • 用于验证键空间 kms 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'organizations';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'maps';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'apps';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'app_credentials';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'api_products';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'apiproducts_appslist';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'api_resources';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'app_end_user';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'oauth_20_authorization_codes';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'oauth_20_access_tokens';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'oauth_10_request_tokens';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'oauth_10_access_tokens';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'oauth_10_verifiers';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name ='kms' and columnfamily_name = 'app_enduser_tokens';
  • 用于验证键空间 user_settings 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'user_settings' and columnfamily_name = 'user_settings';
  • 用于验证键空间 keyvaluemap 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'keyvaluemap' and columnfamily_name = 'keyvaluemaps_r21';
  • 用于验证键空间 devconnect 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'devconnect' and columnfamily_name = 'developers';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'devconnect' and columnfamily_name = 'companies';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'devconnect' and columnfamily_name = 'company_developers';
  • 用于验证键空间 counter 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'counter' and columnfamily_name = 'counters_current_version';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'counter' and columnfamily_name = 'counters_with_expiry';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'counter' and columnfamily_name = 'counters';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'counter' and columnfamily_name = 'key_timestamp_count';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'counter' and columnfamily_name = 'timestamp_key';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'counter' and columnfamily_name = 'period_timestamp';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'counter' and columnfamily_name = 'gateway_quota';
  • 用于验证键空间 cache 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'cache' and columnfamily_name = 'cache_entries';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'cache' and columnfamily_name = 'cache_sequence_id_r24';
  • 用于验证键空间 ax_custom_report_model 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'ax_custom_report_model' and columnfamily_name = 'report_description';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'ax_custom_report_model' and columnfamily_name = 'report_id_lookup';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'ax_custom_report_model' and columnfamily_name = 'org_metadata';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'ax_custom_report_model' and columnfamily_name = 'org_report_lookup';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'ax_custom_report_model' and columnfamily_name = 'report_created_view';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'ax_custom_report_model' and columnfamily_name = 'report_viewed_view';
  • 用于验证键空间 auth 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'auth' and columnfamily_name = 'totp';
  • 用于验证键空间 audit 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'audit' and columnfamily_name = 'audits';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'audit' and columnfamily_name = 'audits_ref';
  • 用于验证键空间 apprepo 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apprepo' and columnfamily_name = 'organizations';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apprepo' and columnfamily_name = 'environments';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apprepo' and columnfamily_name = 'apiproxies';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apprepo' and columnfamily_name = 'apiproxy_revisions';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apprepo' and columnfamily_name = 'api_proxy_revisions_r21';
  • 用于验证键空间 apimodel 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'apis';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'apis_revision';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'resource';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'method';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'revision_counters';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'template_counters';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'template';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'credentials';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'credentialsv2';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'schemas';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'security';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'apimodel' and columnfamily_name = 'template_auth';
  • 用于验证键空间 identityzone 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'identityzone' and columnfamily_name = 'identityzones';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'identityzone' and columnfamily_name = 'orgtoidentityzone';
  • 用于验证键空间 dek 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'dek' and columnfamily_name = 'keys';
  • 用于验证键空间 analytics 的压缩策略的 CQL： 
    SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'analytics' and columnfamily_name = 'custom_aggregates_defn';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'analytics' and columnfamily_name = 'custom_rules_defn';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'analytics' and columnfamily_name = 'custom_aggregates_defn_updates';
SELECT compaction_strategy_class from system.schema_columnfamilies where keyspace_name = 'analytics' and columnfamily_name = 'custom_rules_defn_updates';