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Kesalahan saat Mengambil Turunan untuk Jalur

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Gejala

Deployment revisi proxy API melalui UI Edge atau API pengelolaan Edge gagal dengan error ZooKeeper "Error saat mengambil turunan untuk jalur".

Pesan Error

Error in deployment for environment prod. 
The revision is deployed, but traffic cannot flow. com.apigee.repository.RepositoryException{ code = repository.zookeeper.UnExpectedError, message = Unexpected error Error while fetching children for path : /organizations/myorg/environments/prod/apiproxies/tinkerbell/revisions, associated contexts = []};

Kemungkinan Penyebab

Penyebab umum error ini adalah masalah konektivitas jaringan antara Message Processor dan ZooKeeper.

Diagnosis

Catatan: Hanya pengguna Edge Private Cloud yang dapat melakukan langkah-langkah berikut. Jika Anda menggunakan Edge Public Cloud, hubungi Dukungan Apigee Edge.

Dapatkan output status deployment untuk API tertentu yang menunjukkan error menggunakan panggilan Management API berikut:

curl -v http://<management-server-IPaddress>:<port#>/organizations/<orgname>/environments/<envname>/apis/<apiname>/deployments -u <username>

Contoh output status deployment yang menunjukkan error:

{ 
"environment" : [ { 
"name" : "prod", 
"revision" : [ { 
"configuration" : { 
"basePath" : "/", 
"steps" : [ ] 
}, 
"name" : "1", 
"server" : [ { 
"error" : "com.apigee.repository.RepositoryException: com.apigee.zookeeper.ZooKeeperException{ code = zookeeper.ErrorFetchingChildren, message = Error while fetching children for path : /organizations/gsc/environments/prod/apiproxies/apigee_test/revisions, associated contexts = []}", 
"status" : "error", 
"type" : [ "message-processor" ], 
"uUID" : "01fc5b23-8ad3-40bf-b059-2fc82cdac111" 
},

Periksa Pemroses Pesan (/opt/apigee/var/log/edge-message-processor/system.log).

Contoh error dari log Message Processor

2017-05-29 01:25:40,592  main ERROR KERNEL - MicroKernel.deployAll() : MicroKernel.deployAll() : Error in deploying the deployment : WebService
com.apigee.zookeeper.ZooKeeperException: Error while checking path existence for path : /regions/dc-2/pods/gateway/servers/099c2603-93a4-4b73-ae03-a55d130adb80/reachable
        at com.apigee.zookeeper.impl.ZooKeeperServiceImpl.exists(ZooKeeperServiceImpl.java:410) ~[zookeeper-1.0.0.jar:na]
        at com.apigee.zookeeper.impl.ZooKeeperServiceImpl.exists(ZooKeeperServiceImpl.java:394) ~[zookeeper-1.0.0.jar:na]
        at com.apigee.services.repository.zookeeper.ZKRepository.exists(ZKRepository.java:280) ~[repository-impl-1.0.0.jar:na]
        at com.apigee.services.repository.RepositoryServiceImpl.exists(RepositoryServiceImpl.java:234) ~[repository-impl-1.0.0.jar:na]
        at com.apigee.registration.info.StatusBuilder.build(StatusBuilder.java:26) ~[registration-1.0.0.jar:na]
        at com.apigee.registration.ServerRegistrationServiceImpl.buildServerInfo(ServerRegistrationServiceImpl.java:856) ~[registration-1.0.0.jar:na]
        at com.apigee.registration.ServerRegistrationServiceImpl.start(ServerRegistrationServiceImpl.java:122) ~[registration-1.0.0.jar:na]
        at com.apigee.kernel.service.deployment.ServiceDeployer.startService(ServiceDeployer.java:167) ~[microkernel-1.0.0.jar:na]
        at com.apigee.kernel.service.deployment.ServiceDeployer.deploy(ServiceDeployer.java:70) ~[microkernel-1.0.0.jar:na]
        at com.apigee.kernel.service.deployment.ServiceDeployer.deployDependantServices(ServiceDeployer.java:356) ~[microkernel-1.0.0.jar:na]
        at com.apigee.kernel.service.deployment.ServiceDeployer.deploy(ServiceDeployer.java:76) ~[microkernel-1.0.0.jar:na]
        at com.apigee.kernel.service.deployment.ServiceDeployer.deployDependantServices(ServiceDeployer.java:356) ~[microkernel-1.0.0.jar:na]
        at com.apigee.kernel.service.deployment.ServiceDeployer.deploy(ServiceDeployer.java:76) ~[microkernel-1.0.0.jar:na]
        at com.apigee.kernel.MicroKernel.deployAll(MicroKernel.java:178) [microkernel-1.0.0.jar:na]
        at com.apigee.kernel.MicroKernel.start(MicroKernel.java:139) [microkernel-1.0.0.jar:na]
        at com.apigee.kernel.MicroKernel.start(MicroKernel.java:135) [microkernel-1.0.0.jar:na]
        at com.apigee.kernel.MicroKernel.main(MicroKernel.java:84) [microkernel-1.0.0.jar:na]
Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /regions/dc-2/pods/gateway/servers/099c2603-93a4-4b73-ae03-a55d130adb80/reachable
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1073) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at com.apigee.zookeeper.impl.ZooKeeperServiceImpl.exists(ZooKeeperServiceImpl.java:402) ~[zookeeper-1.0.0.jar:na]
        ... 16 common frames omitted

Jika Anda melihat error serupa seperti yang ditunjukkan dalam contoh di atas, lakukan langkah-langkah berikut:
1. Uji konektivitas dari Pemroses Pesan ke server ZooKeeper pada port 2181 menggunakan langkah-langkah berikut:
  1. Jika telnet tersedia, gunakan telnet:
```
telnet <ZooKeeper-IP> 2181
```
  2. Jika telnet tidak tersedia, gunakan netcat untuk memeriksa konektivitas sebagai berikut:
```
nc -vz <ZooKeeper-IP> 2181
```
  3. Jika Anda mendapatkan respons "Koneksi Ditolak" atau "Waktu tunggu koneksi habis", libatkan tim operasi jaringan Anda. Buka bagian Resolusi di bawah.
Jika Anda menemukan hal lain, hubungi Dukungan Apigee Edge.

Resolusi

Catatan: Hanya pengguna Edge Private Cloud yang dapat melakukan langkah-langkah berikut. Jika Anda menggunakan Edge Public Cloud, hubungi Dukungan Apigee Edge.

Bekerja samalah dengan tim jaringan Anda untuk:
1. 1. Pastikan konektivitas antara Pemroses Pesan dan semua node ZooKeeper diizinkan pada port 2181.
  2. Hapus semua pembatasan firewall atau penyiapan aturan keamanan dari Pemroses Pesan untuk memungkinkan konektivitas ke port 2181 di server ZooKeeper.
2. Jika ada masalah jaringan pada Pemroses Pesan, memulai ulang Pemroses Pesan tertentu yang menunjukkan error (sesuai dengan output status deployment) mungkin dapat memperbaiki masalah tersebut. Mulai ulang Pemroses Pesan tertentu:
```
/opt/apigee/apigee-service/bin/apigee-service edge-message-processor restart
```
Jika masalah berlanjut, hubungi Dukungan Apigee Edge.