9db61adeda
S3A input stream support for the few fs.option.openfile settings. As well as supporting the read policy option and values, if the file length is declared in fs.option.openfile.length then no HEAD request will be issued when opening a file. This can cut a few tens of milliseconds off the operation. The patch adds a new openfile parameter/FS configuration option fs.s3a.input.async.drain.threshold (default: 16000). It declares the number of bytes remaining in the http input stream above which any operation to read and discard the rest of the stream, "draining", is executed asynchronously. This asynchronous draining offers some performance benefit on seek-heavy file IO. Contributed by Steve Loughran. Change-Id: I9b0626bbe635e9fd97ac0f463f5e7167e0111e39
85 lines
3.1 KiB
XML
85 lines
3.1 KiB
XML
<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<FindBugsFilter>
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<!-- same code as in FileSystem is triggering the same warning. -->
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<Match>
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<Class name="org.apache.hadoop.fs.s3native.S3xLoginHelper" />
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<Method name="checkPath" />
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<Bug pattern="ES_COMPARING_STRINGS_WITH_EQ" />
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</Match>
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<!-- Redundant null check makes code clearer, future-proof here. -->
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<Match>
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<Class name="org.apache.hadoop.fs.s3a.S3AFileSystem" />
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<Method name="s3Exists" />
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<Bug pattern="RCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE" />
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</Match>
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<!-- we are using completable futures, so ignore the Future which submit() returns -->
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<Match>
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<Class name="org.apache.hadoop.fs.s3a.S3AFileSystem$InputStreamCallbacksImpl" />
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<Bug pattern="RV_RETURN_VALUE_IGNORED_BAD_PRACTICE" />
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</Match>
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<!--
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findbugs gets confused by lambda expressions in synchronized methods
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and considers references to fields to be unsynchronized.
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As you can't disable the methods individually, we have to disable
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them for the entire class.
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-->
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<Match>
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<Class name="org.apache.hadoop.fs.s3a.S3AInputStream"/>
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<Bug pattern="IS2_INCONSISTENT_SYNC"/>
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</Match>
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<!--
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findbugs reporting RV ignored. Not true.
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"Return value of S3AReadOpContext.getReadInvoker() ignored,
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but method has no side effect"
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-->
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<Match>
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<Class name="org.apache.hadoop.fs.s3a.S3AInputStream"/>
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<Method name="reopen"/>
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<Bug pattern="RV_RETURN_VALUE_IGNORED_NO_SIDE_EFFECT"/>
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</Match>
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<Match>
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<Class name="org.apache.hadoop.fs.s3a.S3AFileSystem"/>
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<Method name="openFileWithOptions"/>
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<Bug pattern="RV_RETURN_VALUE_IGNORED_BAD_PRACTICE"/>
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</Match>
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<Match>
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<Class name="org.apache.hadoop.fs.s3a.s3guard.S3GuardTool$BucketInfo"/>
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<Method name="run"/>
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<Bug pattern="SF_SWITCH_FALLTHROUGH"/>
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</Match>
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<!-- Ignore return value from this method call -->
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<Match>
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<Class name="org.apache.hadoop.fs.s3a.impl.StoreContext"/>
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<Method name="submit"/>
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<Bug pattern="RV_RETURN_VALUE_IGNORED_BAD_PRACTICE"/>
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</Match>
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<!--
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Some of the S3A Instrumentation classes increment volatile references from
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within synchronized contexts; they use volatile to keep the cost
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of these updates and reading them down.
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-->
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<Match>
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<Class name="org.apache.hadoop.fs.s3a.S3AInstrumentation$InputStreamStatisticsImpl"/>
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<Bug pattern="VO_VOLATILE_INCREMENT"/>
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</Match>
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</FindBugsFilter>
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