AsyncStorage Couldn't read row 0, col 0 from CursorWindow

[JAStanton]

Description

When reading values that are too large using AsyncStorage on Android I run into this error:

I wrote a large value with AsyncStorage and later tried to read it, but it crashed.

BaseError: Couldn't read row 0, col 0 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
  at e (/node_modules/react-native/Libraries/Storage/AsyncStorage.js:423:22)
  at None (/node_modules/react-native/Libraries/Storage/AsyncStorage.js:416:71)
  at map ([native code])
  at errors (/node_modules/react-native/Libraries/Storage/AsyncStorage.js:416:51)
  at slicedToArray (/node_modules/react-native/Libraries/Storage/AsyncStorage.js:54:33)

Reproduction

It looks like on iOS we write to disk when the value is above a threshold and on Android we write to sqllite always.

let x = 'x';
while (x.length <= 3194304) {
  x = `${x}${x}`;
}
await AsyncStorage.setItem('@@GARBAGE@@', x); // works
const garbage = await AsyncStorage.getItem('@@GARBAGE@@'); // throws

Solution

In order for me to fix this I'll need to re-write AsyncStorage to write to disk instead of writing to sql. https://github.com/mvayngrib/react-native-safe-async-storage <--- this guys has the right idea but his code is super old and broken.

Additional Information

• React Native version: 0.39.2
• Platform: Android
• Operating System: Samsung Galaxy S4

[brentvatne]

Hello! The react-native 0.29 is very out of date, can you try to repro this in the latest version?

[JAStanton]

Oh I'm sorry I meant to say 0.39.2 (Updated original post)

[davidck]

Did you find a solution? I've ran into this today as well. Storing base64 encoded images in AsyncStorage... on RN 0.41

Same error returned from Android. Solution might have to start writing to disk instead.

[JAStanton]

Yeah, I rewrote the library completely to use file storage instead of async storage that uses sql. You should probably do the same. Check out react-native-fs. Also base64 images is a pretty expensive operation, consider writing image on disk directly, also using react-native-fs On Fri, Mar 10, 2017 at 6:37 PM David Chan <notifications@github.com> wrote: Did you find a solution? I've ran into this today as well. Storing base64 encoded images in AsyncStorage... on RN 0.41 Same error returned from Android. Solution might have to start writing to disk instead. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#12529 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAnYtJFGxrABi5m5egokfot4tNJHWosLks5rkgj0gaJpZM4MJTnn> .

[agrass]

Any recommended solution for this?? use react-native-fs?

[JAStanton]

@agrass react-native-fs is a step in the right direction but it's quite slow. https://github.com/mvayngrib/react-native-safe-async-storage has the right idea but it just needs to be re-written. Another option is to try to read from disk, if you fail catch the failure, dump your state, (full or partial) and keep moving on. I do both approaches in my app. Garbage collect, catch the failure, as well as I using react-native-fs and an approach like react-native-safe-async-storage

[hramos]

Hi there! This issue is being closed because it has been inactive for a while. Maybe the issue has been fixed in a recent release, or perhaps it is not affecting a lot of people. Either way, we're automatically closing issues after a period of inactivity. Please do not take it personally!

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[ThaJay]

It's still an issue when trying to read something large from AsyncStorage.
Please consider an error on write instead.

also:
rt2zz/redux-persist#284
https://github.com/robwalkerco/redux-persist-filesystem-storage
(redux-persist is not needed to use redux-persist-filesystem-storage)

[skv-headless]

@hramos It is not fixed for sure. Here is a small a explanation
https://stackoverflow.com/a/21432966/1410905.
Maybe it worth mentioning in the docs that max size for sqlite cursor is 2mb?

In docs said
On Android, AsyncStorage will use either RocksDB or SQLite based on what is available
would be great to know how to switch to RocksDB?

[agrass]

that limit of 2mb is for only one key/value document of the whole database?

[nevir]

per key/value