Cleaning store policy

Hello

We have developed an application that writes binary data to a store of NoSql as LOB values (about 300 KB each).

The data is first stored and read by another thread and finally deleted from the store.

We see that the size of the store on the file system keeps growing and unused space is never released. In the course of a long ordeal, we have a complete file system!

What is the policy of the cleanest threads? How can configure us the parameters of policy?

The store is configured with replication factor = 3

We tried to set the parameter "serviceLogFileLimit" but nothing has changed and storage has continued to grow over the configured limit...

Thank you

Giovanni

We have developed an application that writes binary data to a store of NoSql as LOB values (about 300 KB each).

The data is first stored and read by another thread and finally deleted from the store.

We see that the size of the store on the file system keeps growing and unused space is never released. During a long test, we got a full file system!

What is the policy of the cleanest threads? How can configure us the parameters of policy?

The store is configured with replication factor = 3

We tried to set the parameter "serviceLogFileLimit" but nothing has changed and storage has continued to grow over the configured limit...

There are a least two uses unrelated to the word "log" in the system, and I think that serviceLogFileLimit is not related to one that's caused you problems here.

The serviceLogFileLimit setting refers to store debug logging output files, that contain log entries with textual information on the events in the system, as the warning events that you mention.  These files are located in the subdirectory of the directory top level store log and have names like admin1_0.log or sn3_0.log.  This setting limits the maximum size of each of these files, which controls when the logging system switches to another log file.

The log files, you are having issues with that are the files of newspapers I, what are the files that I use to store the changes made to the database.

If you were really more space drive due to the recording of debug files, you probably would also change the 'serviceLogFileCount' parameter, which controls the number of copies of a given debug log file is maintained.  The default values of these parameters are serviceLogFileCount = 20 serviceLogFileLimit = 2 MB, for a total of 40 MB per set of log files.  There is a set of files by RN, admin and SN, as well as newspapers combined for the entire store.  To 40 MB for each of these sets, however, who only use it for storage.

To add more details... log store is filled with warnings like this:

2015-02-02 13:51:55.912 UTC WARNING [rg2 - rn3] I: vacuum cleaner 5 files not deleted because they are protected by replication.

2015-02-02 13:51:55.925 UTC WARNING [rg2 - rn2] I: replication prevents deletion of 5 files by vacuum. Start the file = wedges to 0 x 0 CBVLSN 1, end file = 0 x 8 holds last VLSN 6 712

As you say, these warnings mean that the files of newspapers I are selected for a reason any.

The release of ping you provided confirms that replicas are caught up with their masters, because "sequence number" values are the same for all members of each burst.  If this isn't what causes the files to keep.

We run another test which consisted of the following repeated looping: store a LOB, read it, delete it.

Given the size of the LOB (300KB), this operating model will certainly generate a lot of log file data I.

My guess is that the problem is related to the behavior of I which retains a minimum number fixed VLSNs.  There is an IC undocumented parameter that specifies the minimum number of VLSNs, which is by default 20000.

With objects of 300 KB and 20000 VLSNs corresponding to about 10000 objects, i.e. about 3 GB of space dedicated to these VLSNs selected.

I think it would be interesting to experiment with the reduction of the value of this setting to see if this results in the deleted log files.

The name of the parameter I is:

je.rep.minRetainedVLSNs

It would be wise to try to reduce the value of its default value of 20000, say, 2000, which should decrease the minimum space held about 300 MB.

The Administrator's guide provides information about the store settings:

http://docs.Oracle.com/CD/NoSQL/HTML/AdminGuide/SetStoreParams.html

You can set the value of a parameter I by changing the value of the replication node setting configProperties.

You can check the default value of the parameter configProperties starting up of the CLI admin and doing:

view the policy settings

To check the value on a given RN, say rg1 - rn1, if the different nodes have different parameters, do:

display settings-service rg1 - rn1

Add the new parameter to the value of the existing setting.  For example, if you see:

configProperties = foo 30; bar 22;

You can use:

configProperties = foo 30; bar 22; je.rep.minRetainedVLSNs 2000;

Set the current value for all AI by:

plan change-settings-all-rns-wait configProperties - params = "foo 30; bar 22; je.rep.minRetainedVLSNs 2000; »

You must also change the default value by:

change-policy - params configProperties = "foo 30; bar 22; je.rep.minRetainedVLSNs 2000; »

If please give that a try and let us know if this solves the problem.

-Tim

Tags: Database

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