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distributed-systems

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advanced-java

😮 Core Interview Questions & Answers For Experienced Java(Backend) Developers | 互联网 Java 工程师进阶知识完全扫盲:涵盖高并发、分布式、高可用、微服务、海量数据处理等领域知识

  • Updated Jun 24, 2022
  • Java
aphyr
aphyr commented Jun 13, 2022

What happened?

In a Jepsen test run of five etcd 3.5.3 nodes, with process pauses (sending processes SIGSTOP and SIGCONT), compaction (performed via the admin API), and defragmentation (via etcdctl), one etcd process crashed with the following error message:

{"level":"panic","ts":"2022-06-13T14:11:27.870Z","caller":"etcdserver/apply.go:638","msg":"unexpected error during txn","error
trivialfis
trivialfis commented Dec 13, 2020

Currently many more Python projects like dask and optuna are using Python type hints. With the Python package of xgboost gaining more and more features, we should also adopt mypy as a safe guard against some type errors and for better code documentation.

seaweedfs

SeaweedFS is a fast distributed storage system for blobs, objects, files, and data lake, for billions of files! Blob store has O(1) disk seek, cloud tiering. Filer supports Cloud Drive, cross-DC active-active replication, Kubernetes, POSIX FUSE mount, S3 API, S3 Gateway, Hadoop, WebDAV, encryption, Erasure Coding.

  • Updated Jun 26, 2022
  • Go
akka
codefromthecrypt
codefromthecrypt commented Aug 29, 2018

Let's support at least reading "b3" header from a single string, most commonly traceid-spanid-1
It would also be nice to support optionally writing this, especially in message providers or others with constrained environments.

Expected behavior

As discussed on openzipkin/b3-propagation#21 and first implemented here: https://github.com/openzipkin/brave/blob/master/brave/src/main/java/bra

tcrayford
tcrayford commented May 10, 2022

Is your feature request related to a problem? Please describe.

I'd like to be able to debug cadence's space usage by breaking down the size of history events by workflow type. But currently I cannot.

Proposed Solution

Proposed by @longquanzheng in the cadence slack: track a historySize in ES so we can query it for aggregation.

Additional context

https://uber-cadence.sl

good first issue
findinpath
findinpath commented Jun 23, 2022

The Trino codebase has (at the time of this writing) three PrintingLogConsumer classes:

  • io.trino.plugin.deltalake.util.PrintingLogConsumer (logs information)
  • io.trino.testing.kafka.PrintingLogConsumer (writes to a file)
  • io.trino.tests.product.launcher.testcontainers.PrintingLogConsumer (writes to a file)

The PrintingLogConsumer classes from trino-testing-kafka and `trino-produc

good first issue
szokebarnabas
szokebarnabas commented May 13, 2022

Describe the bug
The IMap.get() call will be blocked forever when a com.datastax.oss.driver.api.core.NoNodeAvailableException is thrown from the MapStore.

Setup:
Hazelcast v5.1.1
Cassandra SDK v4.14.1
Client-server setup
Read through cache, Cassandra DB gets called on a cache miss.

Test scenario: Read through cache, Cassandra server is down:

We tested the scenario whe

samarabbas
samarabbas commented May 15, 2021

Need to fix this TODO in the code:

         // TODO: we need to consider adding execution time to mutable state
	// For now execution time will be calculated based on start time and cron schedule/retry policy
	// each time DescribeWorkflowExecution is called.

https://github.com/temporalio/temporal/blob/master/service/history/historyEngine.go#L1184

michelvocks
michelvocks commented Jan 30, 2019

We are using font-awesome V4 and should migrate to font-awesome V5 which comes with its own vue.js module: https://github.com/FortAwesome/vue-fontawesome

Migration includes removing old font-awesome V4 module and changing all existing icons to new vue.js tag.

This is blocked until #114 is merged which comes with first initial integration.

enhancement help wanted good first issue blocked

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