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https://issues.apache.org/jira/browse/FELIX-4195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Wiselka updated FELIX-4195:
--------------------------------
Description:
I ran in to the following problem using the Preferences Service on an embedded
device with a flash memory:
When a preference is changed the sync method is called to persist it. A sudden
power loss occurs. On restart the preference file in the bundle cache is empty
and causes a BackingStoreException: Could not load preference.
It seems to me as that the OS is caching the write to the flash drive and the
change is not actually persisted. I was able to fix this issue by performing a
sync on the FileDescriptor of the OutputStream in the store method of the
DataFileBackingStoreImpl
try {
final FileOutputStream os = (FileOutputStream)
this.getOutputStream(root.getDescription());
this.write(root, os);
os.getFD().sync();
os.close();
}
catch (IOException ioe) {
throw new BackingStoreException("Unable to store preferences.", ioe);
}
was:
I ran in to the following problem using the Preferences Service on an embedded
device with a flash memory:
When a preference is changed the sync method is called to persist it. A sudden
power loss occurs. On restart the preference file in the bundle cache is empty
and causes a BackingStoreException: Could not load preference.
It seems to me as that the OS is caching the write to the flash drive and the
change is not actually persisted. I was able to fix this issue by performing a
sync on the FileDescriptor of the OutputStream in the store method of the
DataFileBackingStoreImpl
{code}
try {
final FileOutputStream os = (FileOutputStream)
this.getOutputStream(root.getDescription());
this.write(root, os);
os.getFD().sync();
os.close();
}
catch (IOException ioe) {
throw new BackingStoreException("Unable to store preferences.",
ioe);
}
{code}
> Sync on a Preference doesn't do a OS side sync
> ----------------------------------------------
>
> Key: FELIX-4195
> URL: https://issues.apache.org/jira/browse/FELIX-4195
> Project: Felix
> Issue Type: Bug
> Components: Preferences Service
> Affects Versions: prefs-1.0.6
> Environment: Anstroem Embedded Linux
> UBIFS on a flash drive
> Reporter: Matt Wiselka
>
> I ran in to the following problem using the Preferences Service on an
> embedded device with a flash memory:
> When a preference is changed the sync method is called to persist it. A
> sudden power loss occurs. On restart the preference file in the bundle cache
> is empty and causes a BackingStoreException: Could not load preference.
> It seems to me as that the OS is caching the write to the flash drive and the
> change is not actually persisted. I was able to fix this issue by performing
> a sync on the FileDescriptor of the OutputStream in the store method of the
> DataFileBackingStoreImpl
> try {
> final FileOutputStream os = (FileOutputStream)
> this.getOutputStream(root.getDescription());
> this.write(root, os);
> os.getFD().sync();
> os.close();
> }
> catch (IOException ioe) {
> throw new BackingStoreException("Unable to store preferences.", ioe);
> }
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