Add Zookeeper data store for Lock Component #27920

GaneshChandrasekaran-zz · 2018-07-10T20:02:24Z

Q	A
Branch?	master
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Fixed tickets	Not applicable
License	MIT
Doc PR	symfony/symfony-docs#10043

This change adds a new feature to the Lock Component to give the capability to store locks in Zookeeper Data Store. The corresponding documentation PR should describe how this works.

The change here also adds a functional test to make sure all the basic functionality of the lock using this data store works.

Requirements for this to work are having a PHP-Zookeeper extension available to use this.

GaneshChandrasekaran-zz · 2018-07-10T21:11:15Z

src/Symfony/Component/Lock/CHANGELOG.md

@@ -1,5 +1,9 @@
 CHANGELOG
 =========
+4.2.0


I am not sure if this correct. Can someone confirm what would go here?

This looks good. But you should add a blank line between the current lines 2 and 3. :)

Thanks. Done.

GaneshChandrasekaran-zz · 2018-07-10T21:12:22Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+ *
+ * @author Ganesh Chandrasekaran <gchandrasekaran@wayfair.com>
+ *
+ * @requires extension zookeeper


I need help with this - Does this make the tests skip if the environment doesn't have a Zookeeper extension installed?

Probably needs to be a class level annotation, not a generic comment in the file

This was in wrong place by mistake. Moved.

src/Symfony/Component/Lock/Store/StoreFactory.php

src/Symfony/Component/Lock/Store/ZookeeperStore.php

linaori · 2018-07-11T14:04:42Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+    /**
+     * A base node within which all the locks for PHP application are managed in the Zookeeper environment.
+     */
+    const LOCK_NODE = '/PHP_LOCK_NODE';


Can you add a modifier? I believe this version of Symfony supports it.

Made it private.

linaori · 2018-07-11T14:05:18Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+    }
+
+    /**
+     * @param \Symfony\Component\Lock\Key $key Key


@param Key $key, but as it doesn't add anything, it can be removed

Replaced with @inheritdoc instead of removing it.

linaori · 2018-07-11T14:06:16Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+     *
+     * @param \Symfony\Component\Lock\Key $key Key
+     *
+     * @return bool


param and return annotations can be removed

Replaced with @inheritdoc instead of removing it.

linaori · 2018-07-11T14:15:20Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+    /**
+     * Retrieve an unique token for the given key.
+     *
+     * @param \Symfony\Component\Lock\Key $key The resource key to be stored in the storage


please import the class

It is already imported. Removed the fully qualified path.

linaori · 2018-07-11T14:16:03Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+ *
+ * @author Ganesh Chandrasekaran <gchandrasekaran@wayfair.com>
+ *
+ * @requires extension zookeeper


Probably needs to be a class level annotation, not a generic comment in the file

linaori · 2018-07-11T14:17:03Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+        try {
+            $zookeeper = new Zookeeper(implode(',', array($zookeeper_server)));
+            // The session creation happens asynchronously, so we can wait for a second to make sure it is established.
+            sleep(1);


perhaps a small while loop and check every 10ms is sufficient? Should probably try to avoid long sleeps.

Have added a while loop of 10 ms each but, still keeping the max sleep time to 1 second

linaori · 2018-07-11T14:17:36Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+    {
+        $zookeeper_server = getenv('ZOOKEEPER_HOST').':2181';
+
+        try {


Does everything really have to be in a try here?

Wrapping the logic to get state in this as well in case it throws an exception.

"Since version 0.3.0, this method emits ZookeeperException and it's derivatives."

For __construct: "This method emits PHP error/warning when parameters count or types are wrong or could not init instance." The test should fail when this occurs, not be skipped, otherwise we'll never know if we made a mistake somewhere or if the connection can't be made. However, both cases are a legit reason to fail a test.

For getState: "This method emits PHP error/warning when it fails to get state of zookeeper connection. " I would very much like to know if this fails, because it might be a setup issue, I rather not miss this if something broke.

To me it sounds like the whole try/catch should be removed and the markTestAsSkipped for the connection underneath the while loop, should trigger a failure instead. If there would be a setup error in travis, we would never be notified of this as everything will always be marked as skipped. This means the test suite will probably just keep reporting that everything is okay.

I agree with you on the first 2 points and have removed the try and catch blocks.

However, I feel like connection errors should not be raised as failures because environments can be flaky for many reasons and we should probably have some other way to be monitoring those. I think that's what @jderusse also wanted to do with Redis, Memcached and other stores.

Having said that, how can I install zookeeper extension and run zookeeper server on the Travis?

I've got experience with php extensions and travis, so I can't help you on that. The result I'm aiming for, is that we can distinguish connection failures (faulty travis setup), from errors, so we know when the tests fail. Environments shouldn't be flaky, because it shouldn't be flaky in production either. If environments are flaky, that should be fixed asap.

linaori · 2018-07-11T14:18:43Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+    }
+
+    /**
+     * @expectedException \Symfony\Component\Lock\Exception\LockConflictedException


Please use $this->expectException(LockConflictedException::class) right before it's supposed to be thrown. Right now if getStore() throws it, this test would pass, while we probably expect it on the second save($key)

This should be fine as is. If getStore throws an then it would fail saying that Failed asserting that exception of type "WhateverException" matches expected exception "\Symfony\Component\Lock\Exception\LockConflictedException". getStore will never throw a LockConflictedException.

"getStore will never throw a LockConflictedException", not in this pull request. Tests should be robust, thus if someone throws an exception in another PR at an earlier point and this test does not fail, the test is wrong.

Removed this test as per @jderusse 's suggestion that I shouldn't be modifying the behavior from the parent class for this.

linaori · 2018-07-11T14:19:32Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+    {
+        $store = $this->getStore();
+
+        $resource = uniqid(__METHOD__, true);


base64 encode on random bytes sounds like a better idea here.

Right. Fixed.

jderusse · 2018-07-12T07:46:20Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+use Symfony\Component\Lock\Key;
+use Symfony\Component\Lock\StoreInterface;
+use Zookeeper;
+use Throwable;


Symfony does not "import" classes without namespace. Use directly \Throwable when needed

Do you mean they don't get autoloaded without namespace? These should be in global namespace and it works fine when I test locally. I don't know if it's a standard but I prefer declaring them at top so I don't have to add \ for every usage. If I am missing something can you please elaborate on this? Thanks!

In PHP you have two options when working with namespace:

importing the namespace (what you have done)

using it directly (ex: new \Foo\Bar)

In Symfony, we never import global class in the global namespace (like Throwable, DateTime, SplFileObject, Exception ...)

So you have to update your code to remove the use Throwable, then use directly \Throwable

Thanks

Thanks @lyrixx ! I will update the code.

linaori · 2018-07-12T07:46:17Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+    {
+        $zookeeper_server = getenv('ZOOKEEPER_HOST').':2181';
+
+        try {


"Since version 0.3.0, this method emits ZookeeperException and it's derivatives."

For __construct: "This method emits PHP error/warning when parameters count or types are wrong or could not init instance." The test should fail when this occurs, not be skipped, otherwise we'll never know if we made a mistake somewhere or if the connection can't be made. However, both cases are a legit reason to fail a test.

For getState: "This method emits PHP error/warning when it fails to get state of zookeeper connection. " I would very much like to know if this fails, because it might be a setup issue, I rather not miss this if something broke.

To me it sounds like the whole try/catch should be removed and the markTestAsSkipped for the connection underneath the while loop, should trigger a failure instead. If there would be a setup error in travis, we would never be notified of this as everything will always be marked as skipped. This means the test suite will probably just keep reporting that everything is okay.

jderusse

As @iltar , I think this Store could be part of a dedicated bundle/bridge (the same question goes for the MongoDbStore and DbalStore ping @nicolas-grekas)

Aside few comments, I've some concerns regarding the reliability of this store: The lock is automatically released if the client session goes away

jderusse · 2018-07-12T07:47:40Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+    /**
+     * @var string A prefix for the locking resource to identify the process
+     */
+    private $prefix;


Looks like a duplicate of const LOCK_NODE

It's not a duplicate, but rather a prefix for every lock node. For example: const LOCK_NODE = PHP_LOCK_NODE, while prefix can be ORDER, so for an ORDER ID 1234, the lock would be created as /PHP_LOCK_NODE/ORDER_1234 I see that the prefix is not really required and the client can pass this in as the resource itself. So removed it. I also removed the const LOCK_NODE as we can let the client decide how they want to organize the nodes.

jderusse · 2018-07-12T07:48:28Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+     * @param string     $lockPrefix Prefix for a locking resource
+     */
+    public function __construct(
+        Zookeeper $zookeeper,


no need to use multiline declaration

jderusse · 2018-07-12T07:51:20Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+    ): string {
+        set_error_handler(array(self::class, 'errorHandlerForCreateNode'));
+        try {
+            // If the node exists then update the value of the node.


I don't get this comment

Bad copy paste. Removed.

jderusse · 2018-07-12T07:57:11Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+                    continue;
+                }
+
+                $nodeCreated = $this->zookeeper->create($subpath, null, $acl);


Who is in charge of cleaning all this intermediate path?

Wouldn't it be easier to provide a node $node without /?

It would be easier, but I also wanted to provide the functionality of having intermediate nodes if anyone wanted to organize those. Ideally it would be preferred to have just /node for the sake of simplicity, but I can specify this in the documentation as a recommendation if that works for you.

IMHO the client shouldn't have to know how stores works internally, and doesn't need to manipulate it. And I'm not sure that organizing "ephemeral nodes" worth it.
Moreover, the service asking a Lock may not (shouldn't?) be aware of the store used. It may not be aware using keys with slashes have a special meaning.

The issue with this feature are:

it add a lot of complexity to the method

it requires to create intermediate nodes that you can't delete theme afterward. what if a jobs locks /foo/{id}/bar and iterate over billions of ids?

Do you have a use case in mind?

I was following the recipe from here: https://zookeeper.apache.org/doc/r3.1.2/recipes.html#sc_recipes_Locks

But that protocol was recommending ephermeal + sequence nodes. Since in our case we don't use sequence nodes, I think it is fine to not support multi-level nodes.

Changed the implementation to support single ephemeral node. In this case, I am validating the input during lock creation. Also added a test case for this.

jderusse · 2018-07-12T07:58:33Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+
+            // If a node needs to be created with the path "/node1/node2/node3",
+            // this loop will create "/node1" and "/node1/node2" before creation of deepest level node.
+            for ($numberOfParts = count($parts); $numberOfParts > 1; $numberOfParts = count($parts)) {


while (count($parts)>1)

jderusse · 2018-07-12T08:07:44Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+
+            $nodeCreated = $this->zookeeper->create($node, $value, $acl, $type);
+            if (!$nodeCreated) {
+                throw new LockAcquiringException('Unable to create node for '.$subpath);


SHouldn't it be a LockConflictException?

If you see the error handler, if another node was created due to a race condition, it would throw a LockConflictedException. If it reaches here, it means it failed to acquire the lock for some other reason.

jderusse · 2018-07-12T08:08:11Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+                throw new LockAcquiringException('Unable to create node for '.$subpath);
+            }
+
+            return $nodeCreated;


jderusse · 2018-07-12T08:09:01Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+     */
+    public function putOffExpiration(Key $key, $ttl)
+    {
+    }


Add a comment saying why there is nothing to do

src/Symfony/Component/Lock/Store/ZookeeperStore.php

jderusse · 2018-07-12T08:13:15Z

src/Symfony/Component/Lock/Store/ZookeeperStore.php

+            return false;
+        }
+
+        return $this->zookeeper->get($lockNodePath) === $this->getToken($key);


what if the node is removed (by a conurrent request) just before this line?

IMHO you can remove the this->zookeeper->exists and wrap this this->zookeeper->get in a try/catch block

The lock can only be removed by the original owner and no other concurrent request can delete it unless someone does it via command line or write a script to delete the nodes.

jderusse · 2018-07-12T08:20:51Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+    /**
+     * @expectedException \Symfony\Component\Lock\Exception\LockConflictedException
+     */
+    public function testSaveTwice()


The original testSaveTwice asserts that the store is able to save the same Key twice. This is the expected behavior of a Store.

If the test does not pass, I suggest to fix the implementation of the store instead of changing the behavior of the test...

You are right, thanks for highlighting that. Removed this function from here.

jderusse · 2018-07-12T08:32:29Z

src/Symfony/Component/Lock/Tests/Store/ZookeeperStoreTest.php

+    {
+        $zookeeper_server = getenv('ZOOKEEPER_HOST').':2181';
+
+        $zookeeper = new Zookeeper(implode(',', array($zookeeper_server)));


How does Zookeeper handle integrity when using a cluster of servers?
Are you sure that creating an existing node would raise an exception even if 2 concurrent requests ask the creation at exactly the same time on 2 distinguished servers?

Great question - Zookeeper always has only 1 leader and accepts writes through that leader and uses quorum, so even if it due to some race condition 2 process try to create a node, the second one will raise a warning and eventuallyLockConflictedException will be thrown.

nicolas-grekas · 2018-07-25T08:52:29Z

Personally, when this is contributed like here, I'm OK with adding this to the component directly, provided the implementation is top quality (double care for reviewers + author).

lyrixx · 2018-07-25T09:36:58Z

I prefer to have it in the core too

GaneshChandrasekaran-zz · 2018-09-19T15:43:02Z

Thanks @nicolas-grekas for the comments, they were really helpful.

On your question

Tests are green but display "ZOO_ERROR@getaddrs@599: getaddrinfo: No such file or directory" messages, is it legit or does it hint an issue

I had tried debugging that but couldn't find root cause and gave up previously. Today however, I was able to find the root cause for that. I was setting the ZOOKEEPER_HOST env variable only in 1 phpunit.xml file. I put it in both places and those errors are gone now. Looks like the config is read from either of those files depending on the deps. I am also not skipping my tests anymore as they should always run correctly.

nicolas-grekas

Lgtm with one minor comment. @jderusse, ok also?

GaneshChandrasekaran-zz · 2018-09-19T18:57:51Z

Thank you very much @jderusse and @nicolas-grekas for your valuable reviews!!!! This is very exciting 🎉

.travis.yml

src/Symfony/Component/Lock/StoreInterface.php

…Store. Modify Store Factory to support initialization of Zookeeper Data Store.

nicolas-grekas · 2018-09-21T11:58:12Z

Thank you @GaneshChandrasekaran.

…andrasekaran) This PR was merged into the 4.2-dev branch. Discussion ---------- Add Zookeeper data store for Lock Component | Q | A | ------------- | --- | Branch? | master | Bug fix? | no | New feature? | yes | BC breaks? | no | Deprecations? | no | Tests pass? | yes | Fixed tickets | Not applicable | License | MIT | Doc PR | symfony/symfony-docs#10043 This change adds a new feature to the Lock Component to give the capability to store locks in Zookeeper Data Store. The corresponding documentation PR should describe how this works. The change here also adds a functional test to make sure all the basic functionality of the lock using this data store works. Requirements for this to work are having a PHP-Zookeeper extension available to use this. Commits ------- c72c297 Add new Zookeeper Data Store. Add functional test for Zookeeper Data Store. Modify Store Factory to support initialization of Zookeeper Data Store.

nicolas-grekas · 2018-09-21T11:58:49Z

I suggest to open a dedicated PR with something like [...] #27920 (comment)

PR welcome!

…k component (Ganesh Chandrasekaran) This PR was merged into the master branch. Discussion ---------- Add documentation for using Zookeeper data store for lock component This is a documentation update for new Feature of the Lock Component. This will be linked to the PR which will be created in https://github.com/symfony/symfony Corresponding code PR: symfony/symfony#27920 Commits ------- 2ba70f0 Add docs for Zookeeper Data Store.

This PR was merged into the 4.2-dev branch. Discussion ---------- [Lock] Wrap release exception | Q | A | ------------- | --- | Branch? | master | Bug fix? | no | New feature? | yes | BC breaks? | no | Deprecations? | no | Tests pass? | yes | Fixed tickets | #27920 (comment) | License | MIT | Doc PR | NA Commits ------- c37f9e9 Wrap release exception

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Add documentation for using Zookeeper data store for lock component symfony/symfony-docs#10043

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GaneshChandrasekaran-zz changed the title ~~Add Zookeeper data store for Lock Component~~ Add Zookeeper data store as a Bridge for Lock Component Jul 22, 2018

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[Lock] Added MongoDBStore #27648

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GaneshChandrasekaran-zz changed the title ~~WIP: Add Zookeeper data store for Lock Component~~ Add Zookeeper data store for Lock Component Sep 19, 2018

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ZOO_ERROR@getaddrs@599: getaddrinfo: No such file or directory php-zookeeper/php-zookeeper#27

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Add new Zookeeper Data Store. Add functional test for Zookeeper Data …

c72c297

…Store. Modify Store Factory to support initialization of Zookeeper Data Store.

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[Lock] Wrap release exception #28538

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[Lock] ZookeeperStore:putOffEpiration throws exception #28696

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Release v4.2.0-BETA1 #29072

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Release v4.2.0-BETA1 #29073

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Add Zookeeper data store for Lock Component #27920

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