YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

// Copyright (c) YugaByte, Inc.

//

// 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.

//

#include "yb/master/master_tablet_service.h"

#include "yb/common/common_flags.h"

#include "yb/common/entity_ids.h"

#include "yb/common/wire_protocol.h"

#include "yb/master/catalog_manager_if.h"

#include "yb/master/master.h"

#include "yb/master/scoped_leader_shared_lock.h"

#include "yb/master/scoped_leader_shared_lock-internal.h"

#include "yb/rpc/rpc_context.h"

#include "yb/util/flag_tags.h"

#include "yb/util/logging.h"

#include "yb/util/result.h"

#include "yb/util/status_format.h"

DEFINE_test_flag(int32, ysql_catalog_write_rejection_percentage, 0,

                 "Reject specified percentage of writes to the YSQL catalog tables.");

TAG_FLAG(TEST_ysql_catalog_write_rejection_percentage, runtime);

using namespace std::chrono_literals;

namespace yb {

namespace master {

// Only SysTablet 0 is bootstrapped on all master peers, and only the master leader

// reads other sys tablets. We check only for tablet 0 so as to have same readiness

// level across all masters.

// Note: If this value changes, then IsTabletServerReady has to be revisited.

constexpr int NUM_TABLETS_SYS_CATALOG = 1;

MasterTabletServiceImpl::MasterTabletServiceImpl(MasterTabletServer* server, Master* master)

    : TabletServiceImpl(server), master_(master) {

}

Result<std::shared_ptr<tablet::AbstractTablet>> MasterTabletServiceImpl::GetTabletForRead(

  const TabletId& tablet_id, tablet::TabletPeerPtr tablet_peer,

  YBConsistencyLevel consistency_level, tserver::AllowSplitTablet allow_split_tablet) {

  // Ignore looked_up_tablet_peer.

  SCOPED_LEADER_SHARED_LOCK(l, master_->catalog_manager_impl());

  RETURN_NOT_OK(l.first_failed_status());

  return master_->catalog_manager()->GetSystemTablet(tablet_id);

}

void MasterTabletServiceImpl::Write(const tserver::WriteRequestPB* req,

                                    tserver::WriteResponsePB* resp,

                                    rpc::RpcContext context) {

  SCOPED_LEADER_SHARED_LOCK(l, master_->catalog_manager_impl());

  if (!l.CheckIsInitializedAndIsLeaderOrRespondTServer(resp, &context)) {

    return;

  }

  if (PREDICT_FALSE(FLAGS_TEST_ysql_catalog_write_rejection_percentage > 0) &&

      req->pgsql_write_batch_size() > 0 &&

      RandomUniformInt(1, 99) <= FLAGS_TEST_ysql_catalog_write_rejection_percentage) {

    context.RespondRpcFailure(rpc::ErrorStatusPB::ERROR_APPLICATION,

        STATUS(InternalError, "Injected random failure for testing."));

      return;

  }

  bool log_versions = false;

  for (const auto& pg_req : req->pgsql_write_batch()) {

    if (pg_req.is_ysql_catalog_change()) {

      const auto &res = master_->catalog_manager()->IncrementYsqlCatalogVersion();

      if (!res.ok()) {

        context.RespondRpcFailure(rpc::ErrorStatusPB::ERROR_APPLICATION,

            STATUS(InternalError, "Failed to increment YSQL catalog version"));

      }

    } else if (FLAGS_log_ysql_catalog_versions && pg_req.table_id() == kPgYbCatalogVersionTableId) {

      log_versions = true;

    }

  }

  tserver::TabletServiceImpl::Write(req, resp, std::move(context));

  if (log_versions) {

    uint64_t catalog_version;

    uint64_t last_breaking_version;

    // The above Write is async, so delay a bit to hopefully read the newly written values.  If the

    // delay was not sufficient, it's not a big deal since this is just for logging.

    SleepFor(100ms);

    if (!master_->catalog_manager()->GetYsqlCatalogVersion(&catalog_version,

                                                           &last_breaking_version).ok()) {

      LOG_WITH_FUNC(ERROR) << "failed to get catalog version, ignoring";

    } else {

      LOG_WITH_FUNC(INFO) << "catalog version: " << catalog_version << ", breaking version: "

                          << last_breaking_version;

    }

  }

}

void MasterTabletServiceImpl::IsTabletServerReady(

    const tserver::IsTabletServerReadyRequestPB* req,

    tserver::IsTabletServerReadyResponsePB* resp,

    rpc::RpcContext context) {

  SCOPED_LEADER_SHARED_LOCK(l, master_->catalog_manager_impl());

  int total_tablets = NUM_TABLETS_SYS_CATALOG;

  resp->set_total_tablets(total_tablets);

  resp->set_num_tablets_not_running(total_tablets);

  // Tablet 0 being ready corresponds to state_ = kRunning in catalog manager.

  // If catalog_status_ in not OK, then catalog manager state_ is not kRunning.

  if (!l.CheckIsInitializedOrRespondTServer(resp, &context, false /* set_error */)) {

    LOG(INFO) << "Zero tablets not running out of " << total_tablets;

  } else {

    LOG(INFO) << "All " << total_tablets << " tablets running.";

    resp->set_num_tablets_not_running(0);

    context.RespondSuccess();

  }

}

namespace {

void HandleUnsupportedMethod(const char* method_name, rpc::RpcContext* context) {

  context->RespondRpcFailure(rpc::ErrorStatusPB::ERROR_APPLICATION,

                             STATUS_FORMAT(NotSupported, "$0 Not Supported!", method_name));

}

} // namespace

void MasterTabletServiceImpl::ListTablets(const tserver::ListTabletsRequestPB* req,

                                          tserver::ListTabletsResponsePB* resp,

                                          rpc::RpcContext context)  {

  HandleUnsupportedMethod("ListTablets", &context);

}

void MasterTabletServiceImpl::ListTabletsForTabletServer(

    const tserver::ListTabletsForTabletServerRequestPB* req,

    tserver::ListTabletsForTabletServerResponsePB* resp,

    rpc::RpcContext context)  {

  HandleUnsupportedMethod("ListTabletsForTabletServer", &context);

}

void MasterTabletServiceImpl::GetLogLocation(const tserver::GetLogLocationRequestPB* req,

                                             tserver::GetLogLocationResponsePB* resp,

                                             rpc::RpcContext context)  {

  HandleUnsupportedMethod("GetLogLocation", &context);

}

void MasterTabletServiceImpl::Checksum(const tserver::ChecksumRequestPB* req,

                                       tserver::ChecksumResponsePB* resp,

                                       rpc::RpcContext context)  {

  HandleUnsupportedMethod("Checksum", &context);

}

} // namespace master

} // namespace yb