Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/140#discussion_r75883491
--- Diff:
core/src/main/java/org/apache/accumulo/core/file/rfile/bcfile/codec/CompressorPool.java
---
@@ -0,0 +1,230 @@
+/*
+ * 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.accumulo.core.file.rfile.bcfile.codec;
+
+import java.io.IOException;
+
+import org.apache.accumulo.core.conf.AccumuloConfiguration;
+import org.apache.accumulo.core.conf.Property;
+import org.apache.accumulo.core.file.rfile.bcfile.Compression.Algorithm;
+import org.apache.commons.pool.impl.GenericKeyedObjectPool;
+import org.apache.hadoop.io.compress.Compressor;
+import org.apache.hadoop.io.compress.Decompressor;
+import org.apache.log4j.Logger;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Compressor factory extension that enables object pooling using Commons
Pool. The design will have a keyed compressor pool and decompressor pool. The
key of
+ * which will be the Algorithm itself.
+ *
+ */
+public class CompressorPool extends CompressorFactory {
+
+ private static final Logger LOG =
Logger.getLogger(CompressorObjectFactory.class);
+
+ /**
+ * Compressor pool.
+ */
+ GenericKeyedObjectPool<Algorithm,Compressor> compressorPool;
+
+ /**
+ * Decompressor pool
+ */
+ GenericKeyedObjectPool<Algorithm,Decompressor> decompressorPool;
+
+ public CompressorPool(AccumuloConfiguration acuConf) {
+
+ super(acuConf);
+
+ compressorPool = new GenericKeyedObjectPool<Algorithm,Compressor>(new
CompressorObjectFactory());
+ // ensure that the pool grows when needed
+
compressorPool.setWhenExhaustedAction(GenericKeyedObjectPool.WHEN_EXHAUSTED_GROW);
+
+ decompressorPool = new
GenericKeyedObjectPool<Algorithm,Decompressor>(new DecompressorObjectFactory());
+ // ensure that the pool grows when needed.
+
decompressorPool.setWhenExhaustedAction(GenericKeyedObjectPool.WHEN_EXHAUSTED_GROW);
+
+ // perform the initial update.
+ update(acuConf);
+
+ }
+
+ public void setMaxIdle(final int size) {
+ // check that we are changing the value.
+ // this will avoid synchronization within the pool
+ if (size != compressorPool.getMaxIdle())
+ compressorPool.setMaxIdle(size);
+ if (size != decompressorPool.getMaxIdle())
+ decompressorPool.setMaxIdle(size);
+ }
+
+ @Override
+ public Compressor getCompressor(Algorithm compressionAlgorithm) throws
IOException {
+ Preconditions.checkNotNull(compressionAlgorithm, "Algorithm cannot be
null");
+ try {
+ return compressorPool.borrowObject(compressionAlgorithm);
+ } catch (Exception e) {
+ // could not borrow the object, therefore we will attempt to create
it
+ // this will most likely result in an exception when returning so an
end will occur
+ LOG.warn("Could not borrow compressor; creating instead", e);
+ return compressionAlgorithm.getCodec().createCompressor();
+ }
+ }
+
+ @Override
+ public void releaseCompressor(Algorithm compressionAlgorithm, Compressor
compressor) {
+ Preconditions.checkNotNull(compressionAlgorithm, "Algorithm cannot be
null");
+ Preconditions.checkNotNull(compressor, "Compressor should not be
null");
+ try {
+ compressorPool.returnObject(compressionAlgorithm, compressor);
+ } catch (Exception e) {
+ LOG.warn("Could not return compressor; closing instead", e);
+ // compressor failed to be returned. Let's free the memory
associated with it
+ compressor.end();
+ }
+
+ }
+
+ @Override
+ public void releaseDecompressor(Algorithm compressionAlgorithm,
Decompressor decompressor) {
+ Preconditions.checkNotNull(compressionAlgorithm, "Algorithm cannot be
null");
+ Preconditions.checkNotNull(decompressor, "Deompressor should not be
null");
+ try {
+ decompressorPool.returnObject(compressionAlgorithm, decompressor);
+ } catch (Exception e) {
+ LOG.warn("Could not return decompressor; closing instead", e);
+ // compressor failed to be returned. Let's free the memory
associated with it
+ decompressor.end();
+ }
+
+ }
+
+ @Override
+ public Decompressor getDecompressor(Algorithm compressionAlgorithm) {
+ Preconditions.checkNotNull(compressionAlgorithm, "Algorithm cannot be
null");
+ try {
+ return decompressorPool.borrowObject(compressionAlgorithm);
+ } catch (Exception e) {
+ LOG.warn("Could not borrow decompressor; creating instead", e);
+ // could not borrow the object, therefore we will attempt to create
it
+ // this will most likely result in an exception when returning so an
end will occur
+ return compressionAlgorithm.getCodec().createDecompressor();
+ }
+ }
+
+ /**
+ * Closes both pools, which will clear and evict the respective
compressor/decompressors. {@inheritDoc}
+ */
+ @Override
+ public void close() {
+ try {
+ compressorPool.close();
+ } catch (Exception e) {
+ LOG.error(e);
--- End diff --
An associated error message would be good.
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