[jira] [Commented] (HDDS-2328) Support large-scale listing
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https://issues.apache.org/jira/browse/HDDS-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16956216#comment-16956216
]
Anu Engineer commented on HDDS-2328:
Agree. We should probably do what S3AFileSystem has done.
> Support large-scale listing
>
>
> Key: HDDS-2328
> URL: https://issues.apache.org/jira/browse/HDDS-2328
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Manager
>Reporter: Rajesh Balamohan
>Assignee: Hanisha Koneru
>Priority: Major
> Labels: performance
>
> Large-scale listing of directory contents takes a lot longer time and also
> has the potential to run into OOM. I have > 1 million entries in the same
> level and it took lot longer time with {{RemoteIterator}} (didn't complete as
> it was stuck in RDB::seek).
> S3A batches it with 5K listing per fetch IIRC. It would be good to have this
> feature in ozone as well.
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[jira] [Commented] (HDDS-2328) Support large-scale listing
[
https://issues.apache.org/jira/browse/HDDS-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16955756#comment-16955756
]
Lokesh Jain commented on HDDS-2328:
---
Currently we do not implement FileSystem#listLocatedStatus api in Ozone.
Therefore it ends up calling listStatus for the entire directory at once which
can lead to OOM. I think we just need to have an implementation for
listLocatedStatus and other such related apis in BasicOzoneFileSystem.
> Support large-scale listing
>
>
> Key: HDDS-2328
> URL: https://issues.apache.org/jira/browse/HDDS-2328
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Manager
>Reporter: Rajesh Balamohan
>Assignee: Hanisha Koneru
>Priority: Major
> Labels: performance
>
> Large-scale listing of directory contents takes a lot longer time and also
> has the potential to run into OOM. I have > 1 million entries in the same
> level and it took lot longer time with {{RemoteIterator}} (didn't complete as
> it was stuck in RDB::seek).
> S3A batches it with 5K listing per fetch IIRC. It would be good to have this
> feature in ozone as well.
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[jira] [Commented] (HDDS-2328) Support large-scale listing
[
https://issues.apache.org/jira/browse/HDDS-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16955650#comment-16955650
]
Rajesh Balamohan commented on HDDS-2328:
Here is the small snippet of the code which was used large listing (directory I
used had millions of entries, which was populated earlier).
ozone src details: https://github.com/apache/hadoop-ozone (commit
b4a1afd60e3a3c7319a1ffa97d5ace3a95ed26f6).
{noformat}
// Get path details
...
...
long sTime = System.currentTimeMillis();
RemoteIterator rit = fs.listLocatedStatus(path);
long count = 0 ;
while(rit.hasNext()) {
rit.next();
count++;
}
long eTime = System.currentTimeMillis();
...
...
{noformat}
> Support large-scale listing
>
>
> Key: HDDS-2328
> URL: https://issues.apache.org/jira/browse/HDDS-2328
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Manager
>Reporter: Rajesh Balamohan
>Assignee: Hanisha Koneru
>Priority: Major
> Labels: performance
>
> Large-scale listing of directory contents takes a lot longer time and also
> has the potential to run into OOM. I have > 1 million entries in the same
> level and it took lot longer time with {{RemoteIterator}} (didn't complete as
> it was stuck in RDB::seek).
> S3A batches it with 5K listing per fetch IIRC. It would be good to have this
> feature in ozone as well.
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[jira] [Commented] (HDDS-2328) Support large-scale listing
[
https://issues.apache.org/jira/browse/HDDS-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16954802#comment-16954802
]
Anu Engineer commented on HDDS-2328:
The Listing API interface already does that. I will take a look at why we are
not paging ... Can you please provide me with repro steps and which version of
branch you tried with this ?
> Support large-scale listing
>
>
> Key: HDDS-2328
> URL: https://issues.apache.org/jira/browse/HDDS-2328
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Manager
>Reporter: Rajesh Balamohan
>Assignee: Hanisha Koneru
>Priority: Major
> Labels: performance
>
> Large-scale listing of directory contents takes a lot longer time and also
> has the potential to run into OOM. I have > 1 million entries in the same
> level and it took lot longer time with {{RemoteIterator}} (didn't complete as
> it was stuck in RDB::seek).
> S3A batches it with 5K listing per fetch IIRC. It would be good to have this
> feature in ozone as well.
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