concurrent transaction throw deadlock error

[wangsenyan]

pm2 start server with two instance ,

two instance connect one mysql server.

  Component.queue = async (obj, appId, projectId, accessToken) => {
    const Project = Component.app.models.project;
    const Page = Component.app.models.page;
    const tx = await Project.beginTransaction({
      isolationLevel: Project.Transaction.REPEATABLE_READ
    });
    const options = { transaction: tx };
    try {
      const userId = accessToken.userId;
      const { pageId, data = [] } = obj;
      const project = await Project.findOne({
        where: { id: projectId, appId, ownerId: userId }
      }, options);
      const info = await Project.updateAll(
        { id: projectId },
        { lastUpdate: new Date() },
        options
      );

      let page = await Page.findById(pageId, options);
      let pages = await Page.find({
        where: { projectId }
      }, options)

      pages.forEach(page => {
        if (page.uuid)
          idMap[page.uuid] = page.id;
      })
      let components = await Component.find(
        {
          where: { projectId, pageId: page.id },
          fields: ["id", "uuid"]
        }, options
      )
      await Page.updateAll({ id: page.id }, { isNeedGenerate: true }, options);
      await tx.commit();
      return { success: true };
    } catch (err) {
      if (tx) {
        await tx.rollback();
      }
  };

i use Jmeter test it , with 50 threads / sec, then throw error
but threads number small for example less than 10, they work well,
mysql deallock

error

so,did i write the code ok ? thanks

it seem miss commit or rollback while concurrent

[achrinza]

Hi @wangsenyan, thanks for opening an issue! Is this an error that occurs only with loopback-connector-mysql, or is it a broader issue that affects the base LoopBack Juggler?

[wangsenyan]

sorry,i don't know,it too odd