Improves S3 retry logic

deeplake/core/storage/s3.py

@@ -5,6 +5,7 @@
 import boto3
 import botocore  # type: ignore
 import posixpath
+import ssl
 from typing import Dict, Optional, Tuple, Type
 from datetime import datetime, timezone
 from botocore.session import ComponentLocator
@@ -41,6 +42,7 @@
     EndpointConnectionError,
     IncompleteReadError,
     SSLError,
+    ssl.SSLError,
 )
 
 try:
@@ -190,8 +192,10 @@ def __setitem__(self, path, content):
                 self._set(path, content)
         except CONNECTION_ERRORS as err:
             tries = self.num_tries
+            retry_wait = 0
             for i in range(1, tries + 1):
                 always_warn(f"Encountered connection error, retry {i} out of {tries}")
+                retry_wait = self._retry_wait_and_extend(retry_wait, err)
                 try:
                     self._set(path, content)
                     always_warn(
@@ -280,8 +284,11 @@ def get_bytes(
                 return self._get_bytes(path, start_byte, end_byte)
         except CONNECTION_ERRORS as err:
             tries = self.num_tries
+            retry_wait = 0
             for i in range(1, tries + 1):
                 always_warn(f"Encountered connection error, retry {i} out of {tries}")
+                retry_wait = self._retry_wait_and_extend(retry_wait, err)
+
                 try:
                     ret = self._get_bytes(path, start_byte, end_byte)
                     always_warn(
@@ -322,8 +329,11 @@ def __delitem__(self, path):
                 self._del(path)
         except CONNECTION_ERRORS as err:
             tries = self.num_tries
+            retry_wait = 0
             for i in range(1, tries + 1):
                 always_warn(f"Encountered connection error, retry {i} out of {tries}")
+                retry_wait = self._retry_wait_and_extend(retry_wait, err)
+
                 try:
                     self._del(path)
                     always_warn(
@@ -338,7 +348,7 @@ def __delitem__(self, path):
 
     @property
     def num_tries(self):
-        return min(ceil((time.time() - self.start_time) / 300), 5)
+        return max(3, min(ceil((time.time() - self.start_time) / 300), 5))
 
     def _keys_iterator(self):
         self._check_update_creds()
@@ -625,11 +635,45 @@ def get_presigned_url(self, key, full=False):
             self._presigned_urls[path] = (url, time.time())
         return url
 
+    def _get_object_size(self, path: str) -> int:
+        obj = self.resource.Object(self.bucket, path)
+        return obj.content_length
+
     def get_object_size(self, path: str) -> int:
         self._check_update_creds()
         path = "".join((self.path, path))
-        obj = self.resource.Object(self.bucket, path)
-        return obj.content_length
+
+        try:
+            return self._get_object_size(path)
+        except botocore.exceptions.ClientError as err:
+            if err.response["Error"]["Code"] == "NoSuchKey":
+                raise KeyError(err) from err
+            if err.response["Error"]["Code"] == "InvalidAccessKeyId":
+                new_error_cls: Type[S3GetError] = S3GetAccessError
+            else:
+                new_error_cls = S3GetError
+            with S3ResetReloadCredentialsManager(self, new_error_cls):
+                return self._get_object_size(path)
+        except CONNECTION_ERRORS as err:
+            tries = self.num_tries
+            retry_wait = 0
+            for i in range(1, tries + 1):
+                always_warn(f"Encountered connection error, retry {i} out of {tries}")
+                retry_wait = self._retry_wait_and_extend(retry_wait, err)
+
+                try:
+                    ret = self._get_object_size(path)
+                    always_warn(
+                        f"Connection re-established after {i} {['retries', 'retry'][i==1]}."
+                    )
+                    return ret
+                except Exception:
+                    pass
+            raise S3GetError(err) from err
+        except botocore.exceptions.NoCredentialsError as err:
+            raise S3GetAccessError from err
+        except Exception as err:
+            raise S3GetError(err) from err
 
     def get_object_from_full_url(self, url: str):
         root = url.replace("s3://", "")
@@ -645,8 +689,11 @@ def get_object_from_full_url(self, url: str):
                 return self._get(path, bucket)
         except CONNECTION_ERRORS as err:
             tries = self.num_tries
+            retry_wait = 0
             for i in range(1, tries + 1):
                 always_warn(f"Encountered connection error, retry {i} out of {tries}")
+                retry_wait = self._retry_wait_and_extend(retry_wait, err)
+
                 try:
                     ret = self._get(path, bucket)
                     always_warn(
@@ -685,8 +732,11 @@ def set_items(self, items: dict):
                 self._set_items(items)
         except CONNECTION_ERRORS as err:
             tries = self.num_tries
+            retry_wait = 0
             for i in range(1, tries + 1):
                 always_warn(f"Encountered connection error, retry {i} out of {tries}")
+                retry_wait = self._retry_wait_and_extend(retry_wait, err)
+
                 try:
                     self._set_items(items)
                     always_warn(
@@ -713,3 +763,13 @@ def get_items(self, keys):
                     yield key, future.result()
                 else:
                     yield key, exception
+
+    def _retry_wait_and_extend(self, retry_wait: int, err: Exception):
+        if not (isinstance(err, ssl.SSLError) or isinstance(err, SSLError)):
+            return 0
+
+        time.sleep(retry_wait)
+
+        if retry_wait == 0:
+            return 1
+        return retry_wait * 2

deeplake/core/storage/tests/test_storage_provider.py

@@ -1,4 +1,9 @@
 import json
+import ssl
+import time
+from unittest.mock import patch
+
+from deeplake.core import S3Provider
 from deeplake.tests.path_fixtures import gcs_creds
 from deeplake.tests.common import is_opt_true
 from deeplake.tests.storage_fixtures import (
@@ -229,3 +234,22 @@ def test_azure_empty_blob(azure_storage):
         azure_storage.get_object_from_full_url(f"{azure_storage.root}/empty_blob")
         == b""
     )
+
+
+@pytest.mark.slow
+def test_s3_backoff():
+    runs = 0
+    s3 = S3Provider("s3://mock")
+
+    def fake_set_items(items: dict):
+        nonlocal runs
+        runs = runs + 1
+
+        raise ssl.SSLError
+
+    start = time.time()
+    with patch("deeplake.core.storage.s3.S3Provider._set_items", wraps=fake_set_items):
+        with pytest.raises(Exception):
+            s3.set_items({"test": "test"})
+        assert runs == 4
+    assert 3 < time.time() - start < 5