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[SMALLFIX] Use RpcContext to organize contexts during RPCs (#7009)
* Use RpcContext to organize contexts during RPCs * Add license header * Fix test and avoid whitebox usage * Fix checkstyle * Update comments and javadocs * Add comments * Use RpcContext consistenly across filesystem master rpcs * Simplify getJournalContext.append * Fix compilation
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425 changes: 209 additions & 216 deletions
425
core/server/master/src/main/java/alluxio/master/file/DefaultFileSystemMaster.java
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core/server/master/src/main/java/alluxio/master/file/RpcContext.java
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| /* | |||
| * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0 | |||
| * (the "License"). You may not use this work except in compliance with the License, which is | |||
| * available at www.apache.org/licenses/LICENSE-2.0 | |||
| * | |||
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, | |||
| * either express or implied, as more fully set forth in the License. | |||
| * | |||
| * See the NOTICE file distributed with this work for information regarding copyright ownership. | |||
| */ | |||
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| package alluxio.master.file; | |||
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| import alluxio.exception.status.UnavailableException; | |||
| import alluxio.master.journal.JournalContext; | |||
| import alluxio.master.journal.NoopJournalContext; | |||
| import alluxio.proto.journal.Journal.JournalEntry; | |||
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| import com.google.common.base.Throwables; | |||
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| import java.io.Closeable; | |||
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| import javax.annotation.Nullable; | |||
| import javax.annotation.concurrent.NotThreadSafe; | |||
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| /** | |||
| * Context passed through the span of a file system master RPC to manage actions that need to be | |||
| * taken when the body of the RPC is finished. | |||
| * | |||
| * Note that we cannot use Guava's {@link com.google.common.io.Closer} because it doesn't make | |||
| * guarantees about the order in which resources are closed. | |||
| */ | |||
| @NotThreadSafe | |||
| public final class RpcContext implements Closeable { | |||
| public static final RpcContext NOOP = | |||
| new RpcContext(NoopBlockDeletionContext.INSTANCE, NoopJournalContext.INSTANCE); | |||
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| @Nullable | |||
| private final BlockDeletionContext mBlockDeletionContext; | |||
| private final JournalContext mJournalContext; | |||
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| // Used during close to keep track of thrown exceptions. | |||
| private Throwable mThrown = null; | |||
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| /** | |||
| * Creates an {@link RpcContext}. This class aggregates different contexts used over the course of | |||
| * an RPC, and makes sure they are closed in the right order when the RPC is finished. | |||
| * | |||
| * @param blockDeleter block deletion context | |||
| * @param journalContext journal context | |||
| */ | |||
| public RpcContext(BlockDeletionContext blockDeleter, JournalContext journalContext) { | |||
| mBlockDeletionContext = blockDeleter; | |||
| mJournalContext = journalContext; | |||
| } | |||
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| /** | |||
| * @return the journal context | |||
| */ | |||
| public JournalContext getJournalContext() { | |||
| return mJournalContext; | |||
| } | |||
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| /** | |||
| * Syntax sugar for getJournalContext().append(entry). | |||
| * | |||
| * @param entry the {@link JournalEntry} to append to the journal | |||
| */ | |||
| public void journal(JournalEntry entry) { | |||
| mJournalContext.append(entry); | |||
| } | |||
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| /** | |||
| * @return the block deletion context | |||
| */ | |||
| public BlockDeletionContext getBlockDeletionContext() { | |||
| return mBlockDeletionContext; | |||
| } | |||
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| @Override | |||
| public void close() throws UnavailableException { | |||
| // JournalContext is closed before block deletion context so that file system master changes | |||
| // get written before block master changes. If a failure occurs between deleting an inode and | |||
| // remove its blocks, it's better to have an orphaned block than an inode with a missing block. | |||
| closeQuietly(mJournalContext); | |||
| closeQuietly(mBlockDeletionContext); | |||
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| if (mThrown != null) { | |||
| Throwables.propagateIfPossible(mThrown, UnavailableException.class); | |||
| throw new RuntimeException(mThrown); | |||
| } | |||
| } | |||
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| private void closeQuietly(AutoCloseable c) { | |||
| if (c != null) { | |||
| try { | |||
| c.close(); | |||
| } catch (Throwable t) { | |||
| if (mThrown != null) { | |||
| mThrown.addSuppressed(t); | |||
| } else { | |||
| mThrown = t; | |||
| } | |||
| } | |||
| } | |||
| } | |||
| } | |||
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