[
https://issues.apache.org/jira/browse/FLINK-7873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16255055#comment-16255055
]
Sihua Zhou commented on FLINK-7873:
-----------------------------------
[~srichter] As you will introduce this feature in Flink 1.5 (~January 2018).
Now, I mostly like to close this issue, even though we have implemented this
feature base on Flink 1.3.2, it has passed tests and will be used in
production. When Flink 1.5 comes we would like to use the community version of
"local recovery". Looking forward this feature in Flink 1.5~
> Introduce CheckpointCacheManager for reading checkpoint data locally when
> performing failover
> ---------------------------------------------------------------------------------------------
>
> Key: FLINK-7873
> URL: https://issues.apache.org/jira/browse/FLINK-7873
> Project: Flink
> Issue Type: New Feature
> Components: State Backends, Checkpointing
> Affects Versions: 1.3.2
> Reporter: Sihua Zhou
> Assignee: Sihua Zhou
>
> Why i introduce this:
> Current recover strategy will always read checkpoint data from remote
> FileStream (HDFS). This will cost a lot of bandwidth when the state is so big
> (e.g. 1T). What's worse, if this job performs recover again and again, it can
> eat up all network bandwidth and do a huge hurt to cluster. So, I proposed
> that we can cache the checkpoint data locally, and read checkpoint data from
> local cache as well as we can, we read the data from remote only if we fail
> locally. The advantage is that if a execution is assigned to the same
> TaskManager as before, it can save a lot of bandwith, and obtain a faster
> recover.
> Solution:
> TaskManager do the cache job and manage the cached data itself. It simple
> use a TTL-like method to manage cache entry's dispose, we dispose a entry if
> it wasn't be touched for a X time, once we touch a entry we reset the TTL for
> it. In this way, all jobs is done by TaskManager, it transparent to
> JobManager. The only problem is that we may dispose a entry that maybe
> useful, in this case, we have to read from remote data finally, but users can
> avoid this by set a proper TTL value according to checkpoint interval and
> other things.
> Can someone give me some advice? I would appreciate it very much~
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
