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Steven Zhen Wu edited comment on FLINK-9061 at 4/4/18 8:20 PM: --------------------------------------------------------------- [~jgrier] Amazon doesn't want to reveal internal details, hence sometimes are pretty vague. Mu understanding is that prefix (before the random/entropy part) has to be fixed. Either way, latest proposal doesn't prevent user from setting the first a few chars as random/entropy part. I just think it is important to give user the full control on key names. was (Author: stevenz3wu): [~jgrier] Amazon doesn't want to reveal internal details, hence sometimes are pretty vague. Mu understanding is that prefix (before the random/entropy part) has to be fixed. Either way, latest proposal doesn't prevent user from setting the first a few chars as random/entropy part. > S3 checkpoint data not partitioned well -- causes errors and poor performance > ----------------------------------------------------------------------------- > > Key: FLINK-9061 > URL: https://issues.apache.org/jira/browse/FLINK-9061 > Project: Flink > Issue Type: Bug > Components: FileSystem, State Backends, Checkpointing > Affects Versions: 1.4.2 > Reporter: Jamie Grier > Priority: Critical > > I think we need to modify the way we write checkpoints to S3 for high-scale > jobs (those with many total tasks). The issue is that we are writing all the > checkpoint data under a common key prefix. This is the worst case scenario > for S3 performance since the key is used as a partition key. > > In the worst case checkpoints fail with a 500 status code coming back from S3 > and an internal error type of TooBusyException. > > One possible solution would be to add a hook in the Flink filesystem code > that allows me to "rewrite" paths. For example say I have the checkpoint > directory set to: > > s3://bucket/flink/checkpoints > > I would hook that and rewrite that path to: > > s3://bucket/[HASH]/flink/checkpoints, where HASH is the hash of the original > path > > This would distribute the checkpoint write load around the S3 cluster evenly. > > For reference: > https://aws.amazon.com/premiumsupport/knowledge-center/s3-bucket-performance-improve/ > > Any other people hit this issue? Any other ideas for solutions? This is a > pretty serious problem for people trying to checkpoint to S3. > > -Jamie > -- This message was sent by Atlassian JIRA (v7.6.3#76005)