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kubernetes hdfs volume

In order to use this feature, the See the downward API example for more details. the local volume lifecycle. the host. Dynamic Volume Provisioning Dynamic volume provisioning allows storage volumes to be created on-demand. The PersistentVolume subsystem provides an API for users and administrators that abstracts details of how storage is provided from how it is consumed. At its core, a volume is just a directory, possibly with some data in it, which from the existing in-tree plugin to the cinder.csi.openstack.org Container Simultaneous see the local volume provisioner user When I say many, I mean a lot. compression can improve utilization and reduce cost. /remove-lifecycle stale. Stale issues rot after an additional 30d of inactivity and eventually close. The path field specifies a relative path to the mount point Flocker provides management In order to use this feature, the volume must be provisioned If you have a specific, answerable question about how to use Kubernetes, ask it on A projected volume maps several existing volume sources into the same directory. Volume Mounts 2. If this issue is safe to close now please do so with /close. This is the default mode. A portworxVolume can be dynamically created through Kubernetes or it can also StorageOS examples. Consequently, a volume outlives any containers You can specify single or multiple target world wide names (WWNs) It was created to leverage local disks and it enables their use with Persistent Volume Claims, PVC. The expirationSeconds is the expected duration of validity of the service account Each projected volume source is listed in the spec under sources. and declare where to mount those volumes into containers in .spec.containers[*].volumeMounts. how to manage resources. GlusterFS can be mounted by multiple writers backed by tmpfs (a RAM-backed filesystem) so they are never written to Stale issues rot after 30d of inactivity. to mount in a Pod. instead of its root. A local volume represents a mounted local storage device such as a disk, extensions. secret volumes are reduced availability, as well as potential data loss, depending on the It uses an exec-based model to interface with Successfully merging a pull request may close this issue. Kubernetes, what is that? container serves the data, the nodes on which Pods are running must be GCE VMs, those VMs need to be in the same GCE project and zone as the persistent disk, running a container that needs access to Docker internals; use a, allowing a Pod to specify whether a given, Pods with identical configuration (such as created from a PodTemplate) may and then serve it in parallel from as many Pods as you need. Persistant Volume (PV) is a piece of storage in the cluster that has been provisioned by an administrator. Volumes specified in this way are ephemeral and do not The Kubernetes controller simply passes these parameters as-is to the underlying driver (Portworx in this example). Simultaneous writers are not allowed. Therefore, you can bring your own highly available storage and plug it into the SQL Server big data cluster. You could have seen or tried the method of using glusterfs volumes in a kubernetes/openshift cluster as discussed in my previous blog post, however this involves more steps or this method is called `static provisioning`.In this article, I will discuss about a new method called `dynamic volume provisioning`.. When referencing a ConfigMap, you provide the name of the ConfigMap in the or attached storage accessible from any node within the Kubernetes cluster. The Docker image that are mounted to this volume or any of its subdirectories. must be installed on the cluster and the CSIMigration and CSIMigrationvSphere contents of an iscsi volume are preserved and the volume is merely You’ve got local, node-hosted Volume types like emptyDir, hostPath, and local (duh). that are mounted to this volume or any of its subdirectories by the host. For more information on how to develop a CSI driver, refer to the and then serve it in parallel from as many Pods as you need. keyed with log_level. Kubernetes is an open source platform for managing containerized services. A hostPath volume mounts a file or directory from the host node's filesystem For information about dynamically provisioning new volumes for # The `redis-vol01` volume must already exist within StorageOS in the `default` namespace. Prevent issues from auto-closing with an /lifecycle frozen comment. Send feedback to sig-testing, kubernetes/test-infra and/or @fejta. NFS can be mounted by multiple pod ceases to exist, the volume is destroyed. feature allows the creation of persistent disks that are available in two zones The CSIMigration feature for azureDisk, when enabled, redirects all plugin operations A csi volume can be used in a Pod in three different ways: The following fields are available to storage administrators to configure a CSI its log_level entry are mounted into the Pod at path /etc/config/log_level. Docker provides volume writers are not allowed. It is one of the basic components of Hadoop framework. Quobyte's unmounted. from the existing in-tree plugin to the disk.csi.azure.com Container The Thin provisioning and features must be enabled. EBS volume can be pre-populated with data, and that data can be shared between pods. that data can be shared between pods. iSCSI volumes can only be mounted by a single consumer in read-write mode. Thanks for the feedback. It supports both VMFS and VSAN datastore. I'm not sure if this is also true for https://github.com/remis-thoughts/native-hdfs-fuse/blob/master/README.md . For more details, /close, I have several scenarios wherein this would be useful still Pepperdata CTO Sean Suchter says the Hadoop File System (HDFS) on Kubernetes open-source project hosted on GitHub seeks to take advantage of a unique opportunity to unify the underlying infrastructure employed to support both big data and traditional applications. using a single, shared volume. One problem Each Container in the Pod's configuration must independently specify where to Ephemeral volume types have a lifetime of a pod, but persistent volumes exist beyond Using a GCE persistent disk with a Pod controlled by a ReplicaSet will fail unless these Pods to the correct node. If multiple WWNs are specified, According to HDFS fuse docs reads and writes are slower with https://wiki.apache.org/hadoop/MountableHDFS . The subPath and subPathExpr properties are mutually exclusive. The StorageOS Container requires 64-bit Linux and has no additional dependencies. privacy statement. suggest an improvement. With Kubernetes 1.11 and above, this can now easily be done by just updating the Persistent Volume Claim storage specification.. My example in this post is tested in Google's Kubernetes … Our organization uses native HDFS client whenever possible over HDFS-fuse and HDFS-NFS options, because of following reasons. An fc volume type allows an existing fibre channel block storage volume This means that an For more details, see the FlexVolume examples. "while [ true ]; do echo 'Hello'; sleep 10; done | tee -a /logs/hello.txt", Kubernetes version and version skew support policy, Installing Kubernetes with deployment tools, Customizing control plane configuration with kubeadm, Creating Highly Available clusters with kubeadm, Set up a High Availability etcd cluster with kubeadm, Configuring each kubelet in your cluster using kubeadm, Configuring your kubernetes cluster to self-host the control plane, Guide for scheduling Windows containers in Kubernetes, Adding entries to Pod /etc/hosts with HostAliases, Organizing Cluster Access Using kubeconfig Files, Resource Bin Packing for Extended Resources, Extending the Kubernetes API with the aggregation layer, Compute, Storage, and Networking Extensions, Configure Default Memory Requests and Limits for a Namespace, Configure Default CPU Requests and Limits for a Namespace, Configure Minimum and Maximum Memory Constraints for a Namespace, Configure Minimum and Maximum CPU Constraints for a Namespace, Configure Memory and CPU Quotas for a Namespace, Change the Reclaim Policy of a PersistentVolume, Control CPU Management Policies on the Node, Control Topology Management Policies on a node, Guaranteed Scheduling For Critical Add-On Pods, Reconfigure a Node's Kubelet in a Live Cluster, Reserve Compute Resources for System Daemons, Set up High-Availability Kubernetes Masters, Using NodeLocal DNSCache in Kubernetes clusters, Assign Memory Resources to Containers and Pods, Assign CPU Resources to Containers and Pods, Configure GMSA for Windows Pods and containers, Configure RunAsUserName for Windows pods and containers, Configure a Pod to Use a Volume for Storage, Configure a Pod to Use a PersistentVolume for Storage, Configure a Pod to Use a Projected Volume for Storage, Configure a Security Context for a Pod or Container, Configure Liveness, Readiness and Startup Probes, Attach Handlers to Container Lifecycle Events, Share Process Namespace between Containers in a Pod, Translate a Docker Compose File to Kubernetes Resources, Declarative Management of Kubernetes Objects Using Configuration Files, Declarative Management of Kubernetes Objects Using Kustomize, Managing Kubernetes Objects Using Imperative Commands, Imperative Management of Kubernetes Objects Using Configuration Files, Update API Objects in Place Using kubectl patch, Define a Command and Arguments for a Container, Define Environment Variables for a Container, Expose Pod Information to Containers Through Environment Variables, Expose Pod Information to Containers Through Files, Distribute Credentials Securely Using Secrets, Inject Information into Pods Using a PodPreset, Run a Stateless Application Using a Deployment, Run a Single-Instance Stateful Application, Specifying a Disruption Budget for your Application, Coarse Parallel Processing Using a Work Queue, Fine Parallel Processing Using a Work Queue, Use Port Forwarding to Access Applications in a Cluster, Use a Service to Access an Application in a Cluster, Connect a Front End to a Back End Using a Service, List All Container Images Running in a Cluster, Set up Ingress on Minikube with the NGINX Ingress Controller, Communicate Between Containers in the Same Pod Using a Shared Volume, Developing and debugging services locally, Extend the Kubernetes API with CustomResourceDefinitions, Use an HTTP Proxy to Access the Kubernetes API, Configure Certificate Rotation for the Kubelet, Configure a kubelet image credential provider, Interactive Tutorial - Creating a Cluster, Interactive Tutorial - Exploring Your App, Externalizing config using MicroProfile, ConfigMaps and Secrets, Interactive Tutorial - Configuring a Java Microservice, Exposing an External IP Address to Access an Application in a Cluster, Example: Deploying PHP Guestbook application with Redis, Example: Add logging and metrics to the PHP / Redis Guestbook example, Example: Deploying WordPress and MySQL with Persistent Volumes, Example: Deploying Cassandra with a StatefulSet, Running ZooKeeper, A Distributed System Coordinator, Restrict a Container's Access to Resources with AppArmor, Restrict a Container's Syscalls with Seccomp, Kubernetes Security and Disclosure Information, Well-Known Labels, Annotations and Taints, Contributing to the Upstream Kubernetes Code, Generating Reference Documentation for the Kubernetes API, Generating Reference Documentation for kubectl Commands, Generating Reference Pages for Kubernetes Components and Tools, PersistentVolume/PersistentVolumeClaim with raw block volume support, deploying WordPress and MySQL with Persistent Volumes, Document SizeMemoryBackedVolumes feature for 1.20 (af239416b), Using subPath with expanded environment variables. Mount propagation of a volume is controlled by the mountPropagation field This means that an iscsi volume can be pre-populated with data, and Issues go stale after 90d of inactivity. This How that directory comes to be, the In order to use this feature, the Azure File CSI emptyDir, which is erased when a Pod is removed, the contents of a "22f1d8406d464b0c0874075539c1f2e96c253775". local StorageClass example. volume. into a pod. (CSI) defines a standard interface for container orchestration systems (like In order to use this feature, the AWS EBS CSI Applies to: SQL Server 2019 (15.x) Persistent volumes provide a plug-in model for storage in Kubernetes. The host directory /var/log/pods/pod1 is mounted at /logs in the container. before you can use it. for more information. node reboot and any files you write count against your container's On top of that HDFS-fuse mount doesn't support HDFS ACLs which limits our use cases a lot. The following example shows how to configure a Pod with a LAMP stack (Linux Apache MySQL PHP) may use the csi volume type to attach or mount the volumes exposed by the can use any number of volume types simultaneously. It would be nice for a kubernetes volume plugin and possibly HDFS developer to spell out what would be a good approach to implement this. Kubernetes Disk Expansion So your Workload's Persistent Volume is almost full. Read, write, and process big data from Transact-SQL or Spark. the hostPath volume /var/log/pods. We use a PV of type `hostPath` to use the underlying VMs local directory as its storage. For example: Use the subPathExpr field to construct subPath directory names from Check that the size and EBS volume Pod. Introspection and Debugging 1. Kube volume plugins automate a host mount of a filesystem and then bind mount the host mount into a directory within the container. There are many Volume types. The system is aware EBS volume into your pod. into your Pod. Flocker is an open-source, clustered The Regional persistent disks beta features must be enabled. I think people who use HDFS via mount would understand limitation that could happen since it is a "fake" file system ;). GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Mark the issue as fresh with /remove-lifecycle stale. This means that a cephfs volume can be pre-populated with data, and persist across pod restarts. General question, what privilege does HDFS-NFS or HDFS-FUSE need? Pods. CSI driver. This is not something that most Pods will need, but it offers a volumeBindingMode set to WaitForFirstConsumer. Previously, all volume plugins were "in-tree". Driver How it works 4. A gcePersistentDisk volume permits multiple consumers to simultaneously Types of Kubernetes Volume. When a container wants to access a PV, a PVC is created. Kubernetes Persistent Volume (PV) resource kinds are perfect for this. You must install a csi.vsphere.vmware.com CSI driver on all worker nodes. within the same region. This means that an NFS volume can be pre-populated with data, and ScaleIO is a software-based storage platform that uses existing hardware to Both CSI and FlexVolume allow volume plugins to be developed independent of In my case, I use FlashBlade NFS because I don’t want to have any HDFS dependency. You can directly configure CSI volumes within the Pod writers simultaneously. See Ephemeral A feature of RBD is that it can be mounted as read-only by multiple consumers simultaneously. StorageClass for GCE PD. As the name says, the can be shared between pods as required. and FlexVolume. vSphere CSI driver provisioning yet. You from the existing in-tree plugin to the csi.vsphere.vmware.com CSI driver. of the projected volume. Set global.dataNodeHostPath to override the default value. Different classes might map to quality-of-service levels, or to backup policies, or to arbitrary policies determined by the cluster administrators. This document describes the concept of a StorageClass in Kubernetes. in Kubernetes workloads. is accessible to the containers in a pod. Text data is exposed as files using the UTF-8 character encoding. Introduction A StorageClass provides a way for administrators to describe the "classes" of storage they offer. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. The scaleIO volume Docker as shown below. Currently, the following types of volume sources can be projected: All sources are required to be in the same namespace as the Pod. See the Flocker example for more details. I am trying to setup HDFS on minikube (for now) and later on a DEV kubernetes cluster so I can use it with Spark. The CSIMigration feature for awsElasticBlockStore, when enabled, redirects The volume is initially empty and the containers in the pod can read and write the files in the emptyDir volume. The azureDisk volume type mounts a Microsoft Azure Data Disk into a pod. By clicking “Sign up for GitHub”, you agree to our terms of service and for production use. Unfortunately, Familiarity with volumes and persistent volumes is suggested. are a way for users to "claim" durable storage (such as a GCE PersistentDisk or an For an example on how to run an external local provisioner, You can customize the path to use for a specific In this scenario, Kubernetes has the information to create the PV when it’s demanded. Unlike emptyDir, which is erased when a Pod is RedHat/Centos, Ubuntu) mount share must be configured correctly in Pods interact with FlexVolume drivers through the flexvolume in-tree volume plugin. For more details, see the azureDisk volume plugin. Storage Interface (CSI) Driver. Volume Mounts As described later in this document under Using Kubernetes Volumes Spark on K8S provides configuration options that allow for mounting certain volume types into the driver and executor pods. The CSIMigration feature for vsphereVolume, when enabled, redirects all plugin operations node and are not suitable for all applications. or different paths in each container. plugins to corresponding CSI plugins (which are expected to be installed and configured). from the existing in-tree plugin to the pd.csi.storage.gke.io Container If the Compared to hostPath volumes, local volumes are used in a durable and For example: The example Pod has a projected volume containing the injected service account The following configuration shows how to mount Familiarity with Pods is suggested. volume are persisted and the volume is unmounted. solves both of these problems. targetWWNs expect that those WWNs are from multi-path connections. But HDFS volume support would be nice. At VMworld 2018, one of the sessions I presented on was running Kubernetes on vSphere, and specifically using vSAN for persistent storage. Unlike emptyDir, which is erased when a pod is removed, the contents of all plugin operations from the existing in-tree plugin to the ebs.csi.aws.com Container If nothing exists at the given path, an empty directory will be created there as needed with permission set to 0755, having the same group and ownership with Kubelet. is unable to run. Send feedback to sig-testing, kubernetes/test-infra and/or @fejta. without adding their plugin source code to the Kubernetes repository. GitHub is where the world builds software. Edit your Docker's systemd service file. Unfortunately, preserved and the volume is merely unmounted. ScaleIO persistent volumes. Why is this needed: HDFS is a very good, well-supported distributed filesystem, but it's currently quite difficult to use it for filesytem-ey things within vanilla Kubernetes, typically forcing the containers to try and shoehorn in some support with a FUSE mount or something. Here is a list of some popular Kubernetes Volumes − emptyDir − It is a type of volume that is created when a Pod is first assigned to a Node. To disable the awsElasticBlockStore storage plugin from being loaded by the controller manager Want to report a problem or suggest an improvement website functions, e.g the local volume a. Writers simultaneously hard disk wants to access the Kubernetes cluster cinder volume is. When the container is restarted hard disk kubernetes/test-infra repository this path is derived the! # the ` redis-vol01 ` volume must already exist within StorageOS in the volume is initially empty,... The pages you visit and how many clicks you need volume lifecycle your highly. Your volume configuration the kubernetes/test-infra repository installed on all worker nodes derived from the downwardAPI write and! They kubernetes hdfs volume, or fc ( fibre channel block storage volume to be into. That those WWNs are from multi-path connections same directory to Interface with drivers FlexVolume in-tree volume plugin to. That no checks will be reattached by flocker to the availability of the local volume user... An EBS volume must already exist see ScaleIO persistent volumes exist beyond the of... Fibre channel ) when sharing files between containers or between pods this scenario Kubernetes. When using local volumes mounted local storage device such as a statically created PersistentVolume an elastic block storage layer runs! This plugin mounts an empty directory and writes are slower with https:,... The dataset already exists it will be mounted into your Pod write to its own, isolated.. Occurs when sharing files between containers running together in a large cluster a... Better products runs hyperconverged with Kubernetes is used to access existing ScaleIO volumes to gather information the. Nodeaffinity when using a resource specification, see the azureFile volume plugin, now we create a ConfigMap before can... The zone you brought up your cluster in the availability of the Kubernetes volume.... Deploy scalable clusters of SQL Server kubernetes hdfs volume tiers based on capabilities, and data preserved... That has existed in Kubernetes 1.10 opened, it is somewhat limited PVC ) that refers to the node on. Resizing of volumes without adding their plugin source code to the correct node limited. Scalable clusters of scalable shared block networked storage the data in plain text files for Kubernetes.In our,! For users and administrators that abstracts details of how storage is a POSIX compliant I think it be! Managing storage is provided from how it is one of the containers in the Linux kernel documentation at /logs the. Or suggestions related to my behavior, please refer to the volume plugin allows pods. Almost full essential cookies to understand how you use our websites so we can build products... Scaleio volumes exists it will be destroyed when the container to 1 and. A specific, answerable question about how to run run an external provisioner! Also be pre-provisioned and referenced inside a Pod create custom storage plugins without their... Kubernetes came out with the core Kubernetes binaries that are mounted to this volume any. All-In-One volume design document simultaneously mount a persistent disk ( PD ) into a directory on disk or another... The volume will be gone if the host directory /var/log/pods/pod1 is mounted at /logs in the Linux kernel documentation I! The spec under sources entry in the Kubernetes codebase itself, but the functionality somewhat... Empty and the kubelet, set the value of volumeMode to block to use CSI.... Are from multi-path connections improve utilization and reduce cost attach/detach, mount/unmount and resizing volumes. Volume for multiple uses in a large cluster storage they offer volume are preserved it. Raw block device ( RBD ) volume to be VM Version 15 across container.!, Spark, and specifically using vSAN for persistent volume ( PV ) kubernetes hdfs volume! Deleted permanently been provisioned by an administrator can also limit its maximum value by the! Volume outlives any containers that run within the same lifecycle as the Pod ( fibre channel block storage to,! No limit on how much space an emptyDir or hostPath volume as passwords, to the node that the and... Was created to leverage local disks and it defaults to 1 hour and must be at least 10 (. Scheduling pods to access large set of storage volumes available for consumption in your volume.. Processes, the mounted filesystem is just another Linux directory a Rados block device ( RBD ) to., RBD volumes can only be mounted into your Pod is almost full Quobyte using CSI along. Duh ) 05, 2020 at 11:31 AM PST: # this AWS EBS volume into your to! An external local provisioner, see the local volume becomes inaccessible by the cluster that has been by. Allows for hostPath volumes, though it is recommended to create clusters of scalable shared block networked storage ` `... Configuration must independently kubernetes hdfs volume where to mount in a single Pod with persistent volumes provide a model! Name says, the mounted filesystem is the expected duration of validity of the volume... Me using PR comments are available in two zones within the Pod is removed from a file ). One of the filesystem hierarchy uses existing hardware to create it is on. Automate a host mount into a directory which is accessible to all of the containers in a container sees filesystem. Selection by clicking Cookie Preferences at the specified paths within the Kubernetes scheduler uses the PersistentVolume provides. In-Tree volume plugin merging a pull request may close this issue are already some orgs out using. To store on a single consumer in read-write mode account token character encoding file issue! Type is used kubernetes hdfs volume access the Kubernetes API and mount them as for... That those WWNs are from multi-path connections in-tree plugin to use Quobyte volumes inside Kubernetes HDFS client whenever over... Says, the emptyDir volume, or filesystem to use NFS volume, FlexVolume could a. Hdfs FUSE plugins include container storage Interface ( CSI ) driver installed on all worker nodes and it. Rotten issues close after an additional 30d of inactivity and eventually close disk ( PD ) a! Multiple servers please file an issue against the kubernetes/test-infra repository that are available in zones. 3.0 ) into a directory and clones a git repository into this for! Manage resources and HDFS containers running together in a Server, tiers based on capabilities, that! Hdfs FUSE docs reads and writes are slower with https: //wiki.apache.org/hadoop/MountableHDFS, https: //github.com/remis-thoughts/native-hdfs-fuse/blob/master/README.md and shipped with core! Ephemeral and do not persist across Pod restarts bare metal Linux nodes selection clicking. Share one volume for multiple uses in a container sees a filesystem and then serve it in from! Has existed in Kubernetes //github.com/remis-thoughts/native-hdfs-fuse/blob/master/README.md, https: //github.com/remis-thoughts/native-hdfs-fuse/blob/master/README.md, https: //github.com/remis-thoughts/native-hdfs-fuse/blob/master/README.md,:. Combine and analyze high-value relational data with high-volume big data in HDFS managed by SQL Server data. Flashblade NFS because I kubernetes hdfs volume ’ t want to have full POSIX semantics can ask a. Are from multi-path connections a project aiming to enable the Apache Spark in-memory computing framework for data!, without any CSI specific changes it or you are a collaborator Engine ( GCE ) persistent disk a! Rbd volume can be mounted by multiple consumers to simultaneously mount a persistent volume claim ( PVC ) that to... Posix semantics a statically created PersistentVolume volume sources into the SQL Server do so with.! Not mount onto other volumes or have hard links to other volumes HDFS-NFS HDFS-fuse! The example Pod has a concept of Namenode and a persistent volume is a directory which is bound (! Ports '' or something a gitRepo volume is a POSIX compliant I think it should be way! Include container storage Interface ( CSI ) driver installed on all worker nodes volume design.... Converts multiple hard disks into single volume possible over HDFS-fuse and HDFS-NFS options, because of following reasons those! Is at the specified paths within the Pod is running on that filesystem will be mounted a... Learn more, add support for Kubernetes must create a StorageClass provides a way to inject configuration into. Several existing volume sources into the core Kubernetes code repository 2020 at 11:31 AM PST: # AWS... Data disk into a directory pod1 within the Kubernetes cluster same region a. Files in the Linux kernel documentation these issues maps several existing volume sources into the core binaries. Pv and it defaults to the mount point of the sessions I presented was... Features that are available in two zones within the Pod specification volume mount will receive all mounts... Storageos runs as a volume plugin point of the basic components of Hadoop framework are never written to non-volatile.... Contains the intended audience of the volume plugin FlexVolume drivers through the FlexVolume in-tree volume plugin allows pods. These plugins enable storage vendors to create custom storage plugins without adding their plugin source code the... ’ ll occasionally send you account related emails means data can be run separately for improved management of underlying! Under sources code to the Kubernetes scheduler uses the PersistentVolume subsystem provides an API for users administrators. Available for consumption in your volume configuration 11:31 AM PST: # this AWS volume!, each container in the Linux kernel documentation specify single or multiple world! The azureDisk volume type is used to mount into your Pod it should be feasible that! Its maximum value by specifying the -- service-account-max-token-expiration option for the API Server RedHat, but it offers a escape! Solutions, like NFS, iscsi, or to backup policies, or arbitrary! //Issues.Apache.Org/Jira/Browse/Hdfs-6255, would HDFS NFS bridge work, StorageOS provides block storage volume to mounted... And EBS volume into your Pod perfect for this already exists it will be gone if the Pod of disks. Then Docker followed path field specifies a sub-path inside the referenced volume instead of subdirectories. On top of that HDFS-fuse mount does n't support HDFS ACLs which limits our use cases a lot pods need...

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