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https://issues.apache.org/jira/browse/HADOOP-16948?focusedWorklogId=566562&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-566562
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ASF GitHub Bot logged work on HADOOP-16948:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 15/Mar/21 21:41
Start Date: 15/Mar/21 21:41
Worklog Time Spent: 10m
Work Description: snehavarma commented on a change in pull request #1925:
URL: https://github.com/apache/hadoop/pull/1925#discussion_r594697477
##########
File path:
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/SelfRenewingLease.java
##########
@@ -0,0 +1,218 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.fs.azurebfs.services;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.TimeUnit;
+
+import
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.FutureCallback;
+import
org.apache.hadoop.thirdparty.com.google.common.util.concurrent.ListenableScheduledFuture;
+import
org.apache.hadoop.thirdparty.org.checkerframework.checker.nullness.qual.Nullable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hadoop.fs.azurebfs.constants.HttpHeaderConfigurations;
+import
org.apache.hadoop.fs.azurebfs.contracts.exceptions.AbfsRestOperationException;
+import
org.apache.hadoop.fs.azurebfs.contracts.exceptions.AzureBlobFileSystemException;
+import org.apache.hadoop.io.retry.RetryPolicies;
+import org.apache.hadoop.io.retry.RetryPolicy;
+
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.INFINITE_LEASE_DURATION;
+import static
org.apache.hadoop.fs.azurebfs.services.AbfsErrors.ERR_ACQUIRING_LEASE;
+import static
org.apache.hadoop.fs.azurebfs.services.AbfsErrors.ERR_LEASE_FUTURE_EXISTS;
+import static
org.apache.hadoop.fs.azurebfs.services.AbfsErrors.ERR_NO_LEASE_THREADS;
+
+/**
+ * An Azure blob lease that automatically renews itself indefinitely by
scheduling lease
+ * operations through the ABFS client. Use it to prevent writes to the blob by
other processes
+ * that don't have the lease.
+ *
+ * Creating a new Lease object blocks the caller until the Azure blob lease is
acquired. It will
+ * retry a fixed number of times before failing if there is a problem
acquiring the lease.
+ *
+ * Call free() to release the Lease. If the holder process dies, the lease
will time out since it
+ * won't be renewed.
+ */
+public final class SelfRenewingLease {
+ private static final Logger LOG =
LoggerFactory.getLogger(SelfRenewingLease.class);
+
+ static final float LEASE_RENEWAL_PERCENT_OF_DURATION = 0.67f; // Lease
renewal percent of duration
+
+ static final int LEASE_ACQUIRE_RETRY_INTERVAL = 10; // Retry interval for
acquiring lease in secs
+ static final int LEASE_ACQUIRE_MAX_RETRIES = 7; // Number of retries for
acquiring lease
+
+ private final AbfsClient client;
+ private final String path;
+ private final int duration;
+ private final int renewalPeriod;
+
+ // Lease status variables
+ private volatile boolean leaseFreed;
+ private volatile String leaseID = null;
+ private volatile Throwable exception = null;
+ private volatile ListenableScheduledFuture<AbfsRestOperation> future = null;
+
+ public static class LeaseException extends AzureBlobFileSystemException {
+ public LeaseException(Throwable t) {
+ super(ERR_ACQUIRING_LEASE + ": " + t, t);
+ }
+
+ public LeaseException(String s) {
+ super(s);
+ }
+ }
+
+ public SelfRenewingLease(AbfsClient client, String path, int duration)
throws AzureBlobFileSystemException {
Review comment:
Hey Billie just wanted to add that it might not be charged as write ops
but instead come under other ops or metadata ops. Either way it will be extra
cost just not as high as write transaction charges.
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Issue Time Tracking
-------------------
Worklog Id: (was: 566562)
Time Spent: 4.5h (was: 4h 20m)
> ABFS: Support single writer dirs
> --------------------------------
>
> Key: HADOOP-16948
> URL: https://issues.apache.org/jira/browse/HADOOP-16948
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Billie Rinaldi
> Assignee: Billie Rinaldi
> Priority: Minor
> Labels: abfsactive, pull-request-available
> Time Spent: 4.5h
> Remaining Estimate: 0h
>
> This would allow some directories to be configured as single writer
> directories. The ABFS driver would obtain a lease when creating or opening a
> file for writing and would automatically renew the lease and release the
> lease when closing the file.
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