apache / apache/iotdb

[Bug] Synced data stored as unsequenced

Abierto
#11,441 3 comentarios 1 reacción 0 asignados Ver en GitHub
Lenguaje dominante
Java
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Forks
1.2k
Merge medio
1 d 23 h
PR fusionados (30 d)
115

Descripción

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/iotdb/issues) and found nothing similar.

### Version

Both machines running Ubuntu 20.04 and docker image of IoTDB version 1.2.2

### Describe the bug and provide the minimal reproduce step

1. Start two nodes in standalone configuration
2. Set pipe to cloud node
3. Perform insertions at the edge node

### What did you expect to see?

All data inserted to be stored in the same manner on both nodes.

### What did you see instead?

Although on the edge node data is stored in sequence TsFiles, the cloud node treats synced data as delayed and the data is stored in unsequence TsFiles.

On the cloud node running `du -h .` on the data folder shows most data usage in unsequence files
```
4.0K ./datanode/data/sequence
6.9G ./datanode/data/unsequence/root.gps/2/2808
6.9G ./datanode/data/unsequence/root.gps/2
6.9G ./datanode/data/unsequence/root.gps/1/2808
6.9G ./datanode/data/unsequence/root.gps/1
6.7G ./datanode/data/unsequence/root.gps/3/2808
6.7G ./datanode/data/unsequence/root.gps/3
6.4G ./datanode/data/unsequence/root.gps/4/2808
6.4G ./datanode/data/unsequence/root.gps/4
4.7G ./datanode/data/unsequence/root.gps/5/2808
4.7G ./datanode/data/unsequence/root.gps/5
32G ./datanode/data/unsequence/root.gps
32G ./datanode/data/unsequence
32G ./datanode/data
```

While on the edge nodes running `du -h .` on the data folder shows most data usage in sequence files
```
8.6G ./datanode/data/sequence/root.gps/2/2808
8.6G ./datanode/data/sequence/root.gps/2
6.9G ./datanode/data/sequence/root.gps/4/2808
6.9G ./datanode/data/sequence/root.gps/4
7.6G ./datanode/data/sequence/root.gps/1/2808
7.6G ./datanode/data/sequence/root.gps/1
7.1G ./datanode/data/sequence/root.gps/3/2808
7.1G ./datanode/data/sequence/root.gps/3
30G ./datanode/data/sequence/root.gps
30G ./datanode/data/sequence
26M ./datanode/data/unsequence/root.gps/2/2808
26M ./datanode/data/unsequence/root.gps/2
17M ./datanode/data/unsequence/root.gps/4/2808
17M ./datanode/data/unsequence/root.gps/4
26M ./datanode/data/unsequence/root.gps/1/2808
26M ./datanode/data/unsequence/root.gps/1
26M ./datanode/data/unsequence/root.gps/3/2808
26M ./datanode/data/unsequence/root.gps/3
94M ./datanode/data/unsequence/root.gps
94M ./datanode/data/unsequence
34G ./datanode/data
34G ./datanode
```

Tests performing query operations seem to indicate that this negatively impacts query performance as unsequence files negatively impact query performance. These tests were run using IoTDB version 1.1.1, but since data is still stored as unsequenced in 1.2.2, this behaviour should still be present.

### Anything else?

Edge node is running in a Docker container limited to 4 CPU cores, 4GB of RAM, 44MB/s disk reads, 40MB/s disk writes, 2700 read IOps, 1200 write IOps
Cloud node is running in a Docker container with no limitations. Host machine has a 6 core CPU and 16GB of RAM

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Guía de contribución

Abrir la guía de contribución

Línea de trabajo

Comienza reproduciendo la configuración independiente de dos nodos con la imagen Docker de IoTDB 1.2.2, configurando una pipe desde el nodo edge e inspeccionando las carpetas datanode/data/sequence y datanode/data/unsequence del nodo cloud. Compara los archivos almacenados y el comportamiento de las consultas después de las inserciones en el edge; se considera terminado cuando los datos sincronizados se almacenan como archivos sequence en el nodo cloud sin el impacto en el rendimiento de las consultas indicado.

Escrito por el modelo de indexación a partir del texto del issue.

Evaluación

Stack tecnológico
docker, java
Área
databases, distributed-systems
Tipo de issue
Error
Dificultad
4/5
Tiempo estimado
3-5 días
Estado de actividad
Estancado
Claridad
Bastante claro
Aptitud para principiantes
35/100

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