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Posted to commits@flink.apache.org by se...@apache.org on 2014/06/27 22:32:19 UTC
[1/5] git commit: Fix the managed memory planning after patch
9ce6293075d1a2326df8a2e99c032445a555b28b
Repository: incubator-flink
Updated Branches:
refs/heads/master 9ce629307 -> 5b390d546
Fix the managed memory planning after patch 9ce6293075d1a2326df8a2e99c032445a555b28b
Project: http://git-wip-us.apache.org/repos/asf/incubator-flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-flink/commit/0d0803f5
Tree: http://git-wip-us.apache.org/repos/asf/incubator-flink/tree/0d0803f5
Diff: http://git-wip-us.apache.org/repos/asf/incubator-flink/diff/0d0803f5
Branch: refs/heads/master
Commit: 0d0803f57ad05999047b0a5eeddb59bda7a48182
Parents: 9ce6293
Author: Stephan Ewen <se...@apache.org>
Authored: Fri Jun 27 18:00:32 2014 +0200
Committer: Stephan Ewen <se...@apache.org>
Committed: Fri Jun 27 18:10:14 2014 +0200
----------------------------------------------------------------------
.../client/minicluster/NepheleMiniCluster.java | 9 +++--
.../nephele/taskmanager/TaskManager.java | 40 ++++++++++++--------
2 files changed, 30 insertions(+), 19 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/0d0803f5/stratosphere-clients/src/main/java/eu/stratosphere/client/minicluster/NepheleMiniCluster.java
----------------------------------------------------------------------
diff --git a/stratosphere-clients/src/main/java/eu/stratosphere/client/minicluster/NepheleMiniCluster.java b/stratosphere-clients/src/main/java/eu/stratosphere/client/minicluster/NepheleMiniCluster.java
index 86a6efa..76ee1f9 100644
--- a/stratosphere-clients/src/main/java/eu/stratosphere/client/minicluster/NepheleMiniCluster.java
+++ b/stratosphere-clients/src/main/java/eu/stratosphere/client/minicluster/NepheleMiniCluster.java
@@ -272,7 +272,7 @@ public class NepheleMiniCluster {
config.setBoolean(ConfigConstants.FILESYSTEM_DEFAULT_OVERWRITE_KEY, defaultOverwriteFiles);
config.setBoolean(ConfigConstants.FILESYSTEM_OUTPUT_ALWAYS_CREATE_DIRECTORY_KEY, defaultAlwaysCreateDirectory);
- if(memorySize < 0){
+ if (memorySize < 0){
memorySize = HardwareDescriptionFactory.extractFromSystem().getSizeOfFreeMemory();
// at this time, we need to scale down the memory, because we cannot dedicate all free memory to the
@@ -282,9 +282,12 @@ public class NepheleMiniCluster {
GlobalConfiguration.getLong(ConfigConstants.TASK_MANAGER_NETWORK_BUFFER_SIZE_KEY,
ConfigConstants.DEFAULT_TASK_MANAGER_NETWORK_BUFFER_SIZE);
- memorySize = (long) (0.8 * (memorySize - bufferMem));
+ memorySize = memorySize - bufferMem;
+
+ // apply the fraction that makes sure memory is left to the heap for other data structures and UDFs.
+ memorySize = (long) (memorySize * ConfigConstants.DEFAULT_MEMORY_MANAGER_MEMORY_FRACTION);
- //convert from bytes to mega bytes
+ //convert from bytes to megabytes
memorySize >>>= 20;
}
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/0d0803f5/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/taskmanager/TaskManager.java
----------------------------------------------------------------------
diff --git a/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/taskmanager/TaskManager.java b/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/taskmanager/TaskManager.java
index 0c5e218..58da664 100644
--- a/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/taskmanager/TaskManager.java
+++ b/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/taskmanager/TaskManager.java
@@ -334,9 +334,8 @@ public class TaskManager implements TaskOperationProtocol {
throw new Exception("Failed to instantiate ChannelManager.", ioe);
}
+ // initialize the number of slots
{
- HardwareDescription resources = HardwareDescriptionFactory.extractFromSystem();
-
int slots = GlobalConfiguration.getInteger(ConfigConstants.TASK_MANAGER_NUM_TASK_SLOTS, -1);
if (slots == -1) {
slots = 1;
@@ -347,23 +346,34 @@ public class TaskManager implements TaskOperationProtocol {
LOG.info("Creating " + slots + " task slot(s).");
}
this.numberOfSlots = slots;
+ }
+
+ this.hardwareDescription = HardwareDescriptionFactory.extractFromSystem();
+
+ // initialize the memory manager
+ {
+ // Check whether the memory size has been explicitly configured.
+ final long configuredMemorySize = GlobalConfiguration.getInteger(ConfigConstants.TASK_MANAGER_MEMORY_SIZE_KEY, -1);
+ final long memorySize;
- // Check whether the memory size has been explicitly configured. if so that overrides the default mechanism
- // of taking as much as is mentioned in the hardware description
- long memorySize = GlobalConfiguration.getInteger(ConfigConstants.TASK_MANAGER_MEMORY_SIZE_KEY, -1);
-
- if (memorySize > 0) {
- // manually configured memory size. override the value in the hardware config
- resources = HardwareDescriptionFactory.construct(resources.getNumberOfCPUCores(),
- resources.getSizeOfPhysicalMemory(), memorySize * 1024L * 1024L);
+ if (configuredMemorySize == -1) {
+ // no manually configured memory. take a relative fraction of the free heap space
+ float fraction = GlobalConfiguration.getFloat(ConfigConstants.TASK_MANAGER_MEMORY_FRACTION_KEY, ConfigConstants.DEFAULT_MEMORY_MANAGER_MEMORY_FRACTION);
+ memorySize = (long) (this.hardwareDescription.getSizeOfFreeMemory() * fraction);
+ LOG.info("Using " + fraction + " of the free heap space for managed memory.");
+ }
+ else if (configuredMemorySize <= 0) {
+ throw new Exception("Invalid value for Memory Manager memory size: " + configuredMemorySize);
+ }
+ else {
+ memorySize = configuredMemorySize << 20;
}
- this.hardwareDescription = resources;
final int pageSize = GlobalConfiguration.getInteger(ConfigConstants.TASK_MANAGER_NETWORK_BUFFER_SIZE_KEY,
ConfigConstants.DEFAULT_TASK_MANAGER_NETWORK_BUFFER_SIZE);
// Initialize the memory manager
- LOG.info("Initializing memory manager with " + (resources.getSizeOfFreeMemory() >>> 20) + " megabytes of memory. " +
+ LOG.info("Initializing memory manager with " + (memorySize >>> 20) + " megabytes of memory. " +
"Page size is " + pageSize + " bytes.");
try {
@@ -371,11 +381,9 @@ public class TaskManager implements TaskOperationProtocol {
final boolean lazyAllocation = GlobalConfiguration.getBoolean(ConfigConstants.TASK_MANAGER_MEMORY_LAZY_ALLOCATION_KEY,
ConfigConstants.DEFAULT_TASK_MANAGER_MEMORY_LAZY_ALLOCATION);
- this.memoryManager = new DefaultMemoryManager(resources.getSizeOfFreeMemory(), this.numberOfSlots,
- pageSize);
+ this.memoryManager = new DefaultMemoryManager(memorySize, this.numberOfSlots, pageSize);
} catch (Throwable t) {
- LOG.fatal("Unable to initialize memory manager with " + (resources.getSizeOfFreeMemory() >>> 20)
- + " megabytes of memory.", t);
+ LOG.fatal("Unable to initialize memory manager with " + (memorySize >>> 20) + " megabytes of memory.", t);
throw new Exception("Unable to initialize memory manager.", t);
}
}
[2/5] git commit: Fix checkstyle errors and various warnings.
Posted by se...@apache.org.
Fix checkstyle errors and various warnings.
Project: http://git-wip-us.apache.org/repos/asf/incubator-flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-flink/commit/3c5feae7
Tree: http://git-wip-us.apache.org/repos/asf/incubator-flink/tree/3c5feae7
Diff: http://git-wip-us.apache.org/repos/asf/incubator-flink/diff/3c5feae7
Branch: refs/heads/master
Commit: 3c5feae7da1a52cb928bccf7bee43d4f98faf2c5
Parents: 0d0803f
Author: Stephan Ewen <se...@apache.org>
Authored: Fri Jun 27 20:37:09 2014 +0200
Committer: Stephan Ewen <se...@apache.org>
Committed: Fri Jun 27 21:22:02 2014 +0200
----------------------------------------------------------------------
.../src/main/java/eu/stratosphere/api/java/operators/Keys.java | 1 +
.../api/java/typeutils/runtime/PojoPairComparator.java | 1 +
.../eu/stratosphere/api/java/operator/CoGroupOperatorTest.java | 2 --
.../java/eu/stratosphere/api/java/operator/GroupingTest.java | 2 --
.../java/eu/stratosphere/api/java/operator/JoinOperatorTest.java | 3 ---
.../api/java/type/extractor/PojoTypeInformationTest.java | 4 +---
.../api/java/typeutils/runtime/PojoSerializerTest.java | 2 --
.../nephele/instance/HardwareDescriptionFactory.java | 2 --
.../eu/stratosphere/test/javaApiOperators/DistinctITCase.java | 1 -
9 files changed, 3 insertions(+), 15 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-java/src/main/java/eu/stratosphere/api/java/operators/Keys.java
----------------------------------------------------------------------
diff --git a/stratosphere-java/src/main/java/eu/stratosphere/api/java/operators/Keys.java b/stratosphere-java/src/main/java/eu/stratosphere/api/java/operators/Keys.java
index 8e879d7..3477e00 100644
--- a/stratosphere-java/src/main/java/eu/stratosphere/api/java/operators/Keys.java
+++ b/stratosphere-java/src/main/java/eu/stratosphere/api/java/operators/Keys.java
@@ -187,6 +187,7 @@ public abstract class Keys<T> {
private final TypeInformation<?>[] types;
+ @SuppressWarnings("unused")
private PojoTypeInfo<?> type;
public ExpressionKeys(String[] expressions, TypeInformation<T> type) {
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-java/src/main/java/eu/stratosphere/api/java/typeutils/runtime/PojoPairComparator.java
----------------------------------------------------------------------
diff --git a/stratosphere-java/src/main/java/eu/stratosphere/api/java/typeutils/runtime/PojoPairComparator.java b/stratosphere-java/src/main/java/eu/stratosphere/api/java/typeutils/runtime/PojoPairComparator.java
index e8b4240..c862f13 100644
--- a/stratosphere-java/src/main/java/eu/stratosphere/api/java/typeutils/runtime/PojoPairComparator.java
+++ b/stratosphere-java/src/main/java/eu/stratosphere/api/java/typeutils/runtime/PojoPairComparator.java
@@ -28,6 +28,7 @@ public class PojoPairComparator<T1, T2> extends TypePairComparator<T1, T2> imple
private static final long serialVersionUID = 1L;
+ @SuppressWarnings("unused")
private final int[] keyPositions1, keyPositions2;
private transient Field[] keyFields1, keyFields2;
private final TypeComparator<Object>[] comparators1;
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/CoGroupOperatorTest.java
----------------------------------------------------------------------
diff --git a/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/CoGroupOperatorTest.java b/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/CoGroupOperatorTest.java
index b17e4b9..e4cc949 100644
--- a/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/CoGroupOperatorTest.java
+++ b/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/CoGroupOperatorTest.java
@@ -18,8 +18,6 @@ import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
-import eu.stratosphere.api.java.typeutils.TypeExtractor;
-import eu.stratosphere.types.TypeInformation;
import junit.framework.Assert;
import org.junit.BeforeClass;
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/GroupingTest.java
----------------------------------------------------------------------
diff --git a/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/GroupingTest.java b/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/GroupingTest.java
index 6e7fb65..ad51361 100644
--- a/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/GroupingTest.java
+++ b/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/GroupingTest.java
@@ -18,8 +18,6 @@ import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
-import eu.stratosphere.api.java.typeutils.TypeExtractor;
-import eu.stratosphere.types.TypeInformation;
import junit.framework.Assert;
import org.junit.Test;
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/JoinOperatorTest.java
----------------------------------------------------------------------
diff --git a/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/JoinOperatorTest.java b/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/JoinOperatorTest.java
index f5d5dee..32747c1 100644
--- a/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/JoinOperatorTest.java
+++ b/stratosphere-java/src/test/java/eu/stratosphere/api/java/operator/JoinOperatorTest.java
@@ -14,13 +14,10 @@
**********************************************************************************************************************/
package eu.stratosphere.api.java.operator;
-import java.beans.Expression;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
-import eu.stratosphere.api.java.typeutils.TypeExtractor;
-import eu.stratosphere.types.TypeInformation;
import junit.framework.Assert;
import org.junit.BeforeClass;
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-java/src/test/java/eu/stratosphere/api/java/type/extractor/PojoTypeInformationTest.java
----------------------------------------------------------------------
diff --git a/stratosphere-java/src/test/java/eu/stratosphere/api/java/type/extractor/PojoTypeInformationTest.java b/stratosphere-java/src/test/java/eu/stratosphere/api/java/type/extractor/PojoTypeInformationTest.java
index 065ae0c..772050a 100644
--- a/stratosphere-java/src/test/java/eu/stratosphere/api/java/type/extractor/PojoTypeInformationTest.java
+++ b/stratosphere-java/src/test/java/eu/stratosphere/api/java/type/extractor/PojoTypeInformationTest.java
@@ -13,17 +13,15 @@
package eu.stratosphere.api.java.type.extractor;
-import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
import eu.stratosphere.api.java.typeutils.PojoTypeInfo;
import eu.stratosphere.api.java.typeutils.TypeExtractor;
-import eu.stratosphere.types.Record;
-import eu.stratosphere.types.StringValue;
import eu.stratosphere.types.TypeInformation;
+@SuppressWarnings("unused")
public class PojoTypeInformationTest {
static class SimplePojo {
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-java/src/test/java/eu/stratosphere/api/java/typeutils/runtime/PojoSerializerTest.java
----------------------------------------------------------------------
diff --git a/stratosphere-java/src/test/java/eu/stratosphere/api/java/typeutils/runtime/PojoSerializerTest.java b/stratosphere-java/src/test/java/eu/stratosphere/api/java/typeutils/runtime/PojoSerializerTest.java
index 8adb83b..c66e314 100644
--- a/stratosphere-java/src/test/java/eu/stratosphere/api/java/typeutils/runtime/PojoSerializerTest.java
+++ b/stratosphere-java/src/test/java/eu/stratosphere/api/java/typeutils/runtime/PojoSerializerTest.java
@@ -17,8 +17,6 @@ package eu.stratosphere.api.java.typeutils.runtime;
import java.util.Random;
import com.google.common.base.Objects;
-import com.google.common.hash.HashFunction;
-import com.google.common.hash.Hashing;
import eu.stratosphere.api.common.typeutils.SerializerTestBase;
import eu.stratosphere.api.common.typeutils.TypeSerializer;
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/instance/HardwareDescriptionFactory.java
----------------------------------------------------------------------
diff --git a/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/instance/HardwareDescriptionFactory.java b/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/instance/HardwareDescriptionFactory.java
index 955c0c9..b633032 100644
--- a/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/instance/HardwareDescriptionFactory.java
+++ b/stratosphere-runtime/src/main/java/eu/stratosphere/nephele/instance/HardwareDescriptionFactory.java
@@ -23,8 +23,6 @@ import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
-import eu.stratosphere.configuration.ConfigConstants;
-import eu.stratosphere.configuration.GlobalConfiguration;
import eu.stratosphere.util.OperatingSystem;
/**
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/3c5feae7/stratosphere-tests/src/test/java/eu/stratosphere/test/javaApiOperators/DistinctITCase.java
----------------------------------------------------------------------
diff --git a/stratosphere-tests/src/test/java/eu/stratosphere/test/javaApiOperators/DistinctITCase.java b/stratosphere-tests/src/test/java/eu/stratosphere/test/javaApiOperators/DistinctITCase.java
index 11fcf97..28caed8 100644
--- a/stratosphere-tests/src/test/java/eu/stratosphere/test/javaApiOperators/DistinctITCase.java
+++ b/stratosphere-tests/src/test/java/eu/stratosphere/test/javaApiOperators/DistinctITCase.java
@@ -14,7 +14,6 @@
**********************************************************************************************************************/
package eu.stratosphere.test.javaApiOperators;
-import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Collection;
import java.util.LinkedList;
[4/5] Add first files for system internals documentation
Posted by se...@apache.org.
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/5b390d54/docs/internals/stack.svg
----------------------------------------------------------------------
diff --git a/docs/internals/stack.svg b/docs/internals/stack.svg
new file mode 100644
index 0000000..e45227c
--- /dev/null
+++ b/docs/internals/stack.svg
@@ -0,0 +1,587 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+ xmlns:dc="http://purl.org/dc/elements/1.1/"
+ xmlns:cc="http://creativecommons.org/ns#"
+ xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+ xmlns:svg="http://www.w3.org/2000/svg"
+ xmlns="http://www.w3.org/2000/svg"
+ xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+ xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
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+ sodipodi:docname="Picture2.emf">
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+ rdf:about="">
+ <dc:format>image/svg+xml</dc:format>
+ <dc:type
+ rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+ <dc:title></dc:title>
+ </cc:Work>
+ </rdf:RDF>
+ </metadata>
+ <sodipodi:namedview
+ pagecolor="#ffffff"
+ bordercolor="#666666"
+ borderopacity="1"
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+ gridtolerance="10"
+ guidetolerance="10"
+ inkscape:pageopacity="0"
+ inkscape:pageshadow="2"
+ inkscape:window-width="1920"
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+ inkscape:zoom="1.5267495"
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[3/5] git commit: Add "How to contribute" and "coding guidelines" to
the project.
Posted by se...@apache.org.
Add "How to contribute" and "coding guidelines" to the project.
[ci skip]
Project: http://git-wip-us.apache.org/repos/asf/incubator-flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-flink/commit/05ff3339
Tree: http://git-wip-us.apache.org/repos/asf/incubator-flink/tree/05ff3339
Diff: http://git-wip-us.apache.org/repos/asf/incubator-flink/diff/05ff3339
Branch: refs/heads/master
Commit: 05ff3339c5f45f8db8062b2a7dd3397f0ec66353
Parents: 3c5feae
Author: Stephan Ewen <se...@apache.org>
Authored: Fri Jun 27 17:41:22 2014 +0200
Committer: Stephan Ewen <se...@apache.org>
Committed: Fri Jun 27 21:22:14 2014 +0200
----------------------------------------------------------------------
docs/coding_guidelines.md | 65 +++++++++++++++++++++++++++++++
docs/how_to_contribute.md | 86 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 151 insertions(+)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/05ff3339/docs/coding_guidelines.md
----------------------------------------------------------------------
diff --git a/docs/coding_guidelines.md b/docs/coding_guidelines.md
new file mode 100644
index 0000000..6ab5475
--- /dev/null
+++ b/docs/coding_guidelines.md
@@ -0,0 +1,65 @@
+---
+title: "Coding Guidelines"
+---
+
+These are the coding and style guidelines that we follow in the Flink project.
+
+## Guidelines for pull requests and patches
+
+- A pull request should relate to a JIRA issue; create an issue if none exists for the change you want to make. The latest commit message should reference that issue. An example commit message would be "[FLINK-633] Fix NullPointerException for empty UDF parameters". That way, the pull request automatically gives a description of what it does, for example what bug does it fix in what way?
+
+- We consider pull requests as requests to merge the referenced code *as is* into the current *stable* master branch. Therefore, a pull request should not be "work in progress". Open a pull request if you are confident that it can be merged into the current master branch without problems. If you rather want comments on your code, post a link to your working branch.
+
+- Please do not combine various unrelated changes in a single pull request. Rather, open multiple individual pull requests. This ensures that pull requests are *topic related*, can be merged more easily, and typically result in topic-specific merge conflicts only.
+
+- Any pull request where the tests do not pass or which does not compile will not undergo any further review. We recommend to connect your private GitHub accounts with [Travis CI](http://travis-ci.org/) (like the Flink GitHub repository). Travis will run tests for all tested environments whenever you push something into *your* Github repository.
+
+- Please keep reformatting of source files to a minimum. Diffs become unreadable if you (or your IDE automatically) remove or replace whitespaces, reformat code, or comments. Also, other patches that affect the same files become un-mergeable. Please configure your IDE such that code is not automatically reformatted. Pull requests with excessive or unnecessary code reformatting might be rejected.
+
+- All new features need to be backed by tests, *strictly*. It is very easy that a later merge accidentally throws out a feature or breaks it. This will not be caught if the feature is not guarded by tests. Anything not covered by a test is considered cosmetic.
+
+- Before opening a pull request follow this checklist:
+ - Rebase onto the latest version of the master branch
+ - Clean up your commits, i.e., squash them in a reasonable way and give meaningful commit messages
+ - Run *all* tests either locally with ```mvn clean verify``` or use Travis CI to check the build
+
+- When you get comments on the pull request asking for changes, append commits for these changes. *Do not rebase and squash them.* It allows people to review the cleanup work independently. Otherwise reviewers have to go through the entire set of diffs again.
+
+- Public methods and classes that are part of the user-facing API need to have JavaDocs. Please write meaningful docs. Good docs are concise and informative.
+
+- Give meaningful exception messages. Try to imagine why an exception could be thrown (what a user did wrong) and give a message that will help a user to resolve the problem.
+
+- Follow the checkstyle rules (see below). The checkstyle plugin verifies these rules when you build the code. If your code does not follow the checkstyle rules, Maven will not compile it and consequently the build will fail.
+
+
+## Coding Style Guidelines
+
+- Make sure you have Apache License headers in your files. The RAT plugin is checking for that when you build the code.
+
+- We are using tabs for indentation, not spaces. We are not religious there, it just happened to be the way that we started with tabs, and it is important to not mix them (merge/diff conflicts).
+
+- All statements after `if`, `for`, `while`, `do`, ... must always be encapsulated in a block with curly braces (even if the block contains one statement):
+```
+for (...) {
+ ...
+}
+```
+If you are wondering why, recall the famous [*goto bug*](https://www.imperialviolet.org/2014/02/22/applebug.html) in Apple's SSL library.
+
+
+- Do not use wildcard imports in the core files. They can cause problems when adding to the code and in some cases even during refactoring. Exceptions are the Tuple classes, Tuple-related utilities, and Flink user programs, when importing operators/functions. Tests are a special case of the user programs.
+
+- Remove all unused imports.
+
+- Do not use raw generic types, unless strictly necessary (sometime necessary for signature matches, arrays).
+
+- Add annotations to suppress warnings, if they cannot be avoided (such as "unchecked", or "serial")
+
+- Do not add "non-javadoc" comments.
+
+- Add comments to your code. What is it doing? Add JavaDocs or inherit them by not adding any comments to the methods. Do not automatically generate comments and avoid unnecessary comments like
+```
+i++; // increment by one
+```
+
+
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/05ff3339/docs/how_to_contribute.md
----------------------------------------------------------------------
diff --git a/docs/how_to_contribute.md b/docs/how_to_contribute.md
new file mode 100644
index 0000000..ef23c38
--- /dev/null
+++ b/docs/how_to_contribute.md
@@ -0,0 +1,86 @@
+---
+title: "Contribute"
+---
+
+The Flink project welcomes all sorts contributions in the form of code (improvements, features, bugfixes), documentation, tests, and community participation (discussions & questions).
+
+
+
+## Easy Issues for Starters
+
+We maintain all known issues and feature drafts in the [Flink project JIRA](https://issues.apache.org/jira/browse/FLINK-989?jql=project%20%3D%20FLINK).
+
+We also try to maintain a [list of simple "starter issues"](https://issues.apache.org/jira/browse/FLINK-933?jql=project%20%3D%20FLINK%20AND%20labels%20%3D%20starter) that we believe are good tasks for new contributors. Those tasks are meant to allow people to get into the project and become familiar with the process of contributing. Feel free to ask questions about issues that you would be interested in working on.
+
+In addition, you can find a list of ideas for projects and improvements in the [projects wiki page](http://the/wiki/url).
+
+
+
+## Contributing Code & Documentation
+
+This section gives you a brief introduction in how to contribute code and documentation to Flink. We maintain both the code and the documentation in the same repository, so the process is essentially the same for both. We use [git](http://git-scm.com/) for the code and documentation version control.
+
+The Flink project accepts code contributions though the [GitHub Mirror](https://github.com/apache/incubator-flink), in the form of [Pull Requests](https://help.github.com/articles/using-pull-requests). Pull requests are basically a simpler way of offering a patch, by providing a pointer to a code branch that contains the change.
+
+
+### Setting up the Infrastructure and Creating a Pull Request
+
+1. The first step is to create yourself a copy of the Flink code base. We suggest to fork the [Flink GitHub Mirror Repository](https://github.com/apache/incubator-flink) into your own [GitHub](https://github.com) account. You need to register on GitHub for that, if you have no account so far.
+
+2. Next, clone your repository fork to your local machine.
+```
+git clone https://github.com/<your-user-name>/incubator-flink.git
+```
+
+3. It is typically helpful to switch to a *topic branch* for the changes. To create a dedicated branch based on the current master, use the following command:
+```
+git checkout -b myBranch master
+```
+
+4. Now you can create your changes, compile the code, and validate the changes. Here are some pointers on how to [set up the Eclipse IDE for development](https://github.com/apache/incubator-flink/#eclipse-setup-and-debugging), and how to [build the code](https://github.com/apache/incubator-flink/#build-stratosphere).
+
+5. After you have finalized your contribution, verify the compliance with the contribution guidelines (see below), and commit them. To make the changes easily mergeable, please rebase them to the latest version of the main repositories master branch. Assuming you created a topic branch (step 3), you can follow this sequence of commands to do that:
+Switch to the master branch, update it to the latest revision, switch back to your topic branch, and rebase it on top of the master branch.
+```
+git checkout master
+git pull https://github.com/apache/incubator-flink.git master
+git checkout myBranch
+git rebase master
+```
+Have a look [here](https://help.github.com/articles/using-git-rebase) for more information about rebasing commits.
+
+
+6. Push the contribution it back into your fork of the Flink repository.
+```
+git push origin myBranch
+```
+Go the website of your repository fork (`https://github.com/<your-user-name>/incubator-flink`) and use the "Create Pull Request" button to start creating a pull request. Make sure that the base fork is `apache/incubator-flink master` and the head fork selects the branch with your changes. Give the pull request a meaningful description and send it.
+
+
+### Verifying the Compliance of your Code
+
+Before sending a patch or pull request, please verify that it complies with the guidelines of the project. While we try to keep the set of guidelines small and easy, it is important to follow those rules in order to guarantee good code quality, to allow efficient reviews, and to allow committers to easily merge your changes.
+
+Please have a look at the [coding guidelines](coding_guidelines.html) for a guide to the format of code and pull requests.
+
+Most important of all, verify that your changes are correct and do not break existing functionality. Run the existing tests by calling `mvn verify` in the root directory of the repository, and make sure that the tests succeed. We encourage every contributor to use a *continuous integration* service that will automatically test the code in your repository whenever you push a change. Flink is pre-configured for [Travis CI](http://docs.travis-ci.com/), which can be easily enabled for your private repository fork (it uses GitHub for authentication, so you so not need an additional account). Simply add the *Travis CI* hook to your repository (*settings --> webhooks & services --> add service*) and enable tests for the "incubator-flink" repository on [Travis](https://travis-ci.org/profile).
+
+When contributing documentation, please review the rendered HTML versions of the documents you changed. You can look at the HTML pages by using the rendering script in preview mode.
+```
+cd docs
+./build_docs.sh -p
+```
+Now, open your browser at `http://localhost:4000` and check out the pages you changed.
+
+
+
+## How to become a committer
+
+There is no strict protocol for becoming a committer. Candidates for new committers are typically people that are active contributors and community members.
+
+Being an active community member means participating on mailing list discussions, helping to answer questions, being respectful towards others, and following the meritocratic principles of community management. Since the "Apache Way" has a strong focus on the project community, this part is very important.
+
+Of course, contributing code to the project is important as well. A good way to start is contributing improvements, new features, or bugfixes. You need to show that you take responsibility for the code that you contribute, add tests/documentation, and help maintaining it.
+
+Finally, candidates for new committers are suggested by current committers, mentors, or PMC members, and voted upon by the PMC.
+
[5/5] git commit: Add first files for system internals documentation
Posted by se...@apache.org.
Add first files for system internals documentation
[ci skip]
Project: http://git-wip-us.apache.org/repos/asf/incubator-flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-flink/commit/5b390d54
Tree: http://git-wip-us.apache.org/repos/asf/incubator-flink/tree/5b390d54
Diff: http://git-wip-us.apache.org/repos/asf/incubator-flink/diff/5b390d54
Branch: refs/heads/master
Commit: 5b390d5467cc040b33e6f17329dc87e0693baf5c
Parents: 05ff333
Author: Stephan Ewen <se...@apache.org>
Authored: Fri Jun 27 22:25:36 2014 +0200
Committer: Stephan Ewen <se...@apache.org>
Committed: Fri Jun 27 22:31:49 2014 +0200
----------------------------------------------------------------------
docs/internals/general_arch.md | 8 +
docs/internals/overview.md | 39 ++
docs/internals/projects_dependencies.svg | 567 +++++++++++++++++++++++++
docs/internals/stack.svg | 587 ++++++++++++++++++++++++++
4 files changed, 1201 insertions(+)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/5b390d54/docs/internals/general_arch.md
----------------------------------------------------------------------
diff --git a/docs/internals/general_arch.md b/docs/internals/general_arch.md
new file mode 100644
index 0000000..a2e5ac7
--- /dev/null
+++ b/docs/internals/general_arch.md
@@ -0,0 +1,8 @@
+---
+title: "General Architecture and Process Model"
+---
+
+<img src="projects_dependencies.svg" alt="The Flink sub-projects and their dependencies" height="400px"/>
+
+
+<img src="stack.svg" alt="The Flink component stack" height="400px"/>
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/5b390d54/docs/internals/overview.md
----------------------------------------------------------------------
diff --git a/docs/internals/overview.md b/docs/internals/overview.md
new file mode 100644
index 0000000..4c639b4
--- /dev/null
+++ b/docs/internals/overview.md
@@ -0,0 +1,39 @@
+---
+title: "Overview of Flink System Architecture & Internals"
+---
+
+# Overview
+
+This documentation provides an overview of the architecture of the Flink system
+and its components. It is intended as guide to contributors, and people
+that are interested in the technology behind Flink.
+
+*This documentation is maintained by the contributors of the individual components.
+We kindly ask anyone that adds and changes components to eventually provide a patch
+or pull request that updates these documents as well.*
+
+
+### Architectures and Components
+
+- [General Architecture and Process Model](general_arch.html)
+
+- [Life Cycle of a Program](program_life_cycle.html)
+
+- [Jobs and Scheduling](job_scheduling.html)
+
+- [Distributed Runtime](distributed_runtime.html)
+
+- [Runtime Algorithms and Memory Management](distributed_runtime.html)
+
+- [Program Optimizer](optimizer.html)
+
+- [How-to: Adding a new Operator](add_operator.html)
+
+<!--
+- [Java API, Types, and Type Extraction](types.html)
+-->
+
+<!--
+- [RPC and JobManager Communication](rpc_transfer.html)
+-->
+
http://git-wip-us.apache.org/repos/asf/incubator-flink/blob/5b390d54/docs/internals/projects_dependencies.svg
----------------------------------------------------------------------
diff --git a/docs/internals/projects_dependencies.svg b/docs/internals/projects_dependencies.svg
new file mode 100644
index 0000000..a9ba5af
--- /dev/null
+++ b/docs/internals/projects_dependencies.svg
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