The NodeConnectionsService currently determines which nodes to connect to / disconnect from by inspecting cluster state changes and connecting to added nodes / disconnecting from removed nodes. When a master steps down (for example due to another master-eligible node shutting down which brings the number of master-eligible nodes below minimum_master_master), and the connection to other existing nodes was dropped while pinging, however, the connection to these nodes is not re-established while publishing the first cluster state that establishes the node as master.
This commit changes the NodeConnectionsService connect / disconnect logic to always rely on the state that is to be / was published, looking not only at the added / removed nodes, but validating that exactly all nodes that are currently registered in NodeConnectionsService are connected (corresponds to a NOOP if the node is already connected).
This commit adds a document describing our data replication model in high level terms. The goal is give people basic insight into how things work in order to better understand how read and writes interact, both during normal operations and under failures.
The document in the randomized GetResult can exist with no source (like if the _source was disabled in mappings), that's why the test should not always expect a non null source when the doc exists.
* Promote longs to doubles when a terms agg mixes decimal and non-decimal number
This change makes the terms aggregation work when the buckets coming from different indices are a mix of decimal numbers and non-decimal numbers. In this case non-decimal number (longs) are promoted to decimal (double) which can result in a loss of precision for big numbers.
Fixes#22232
There is a bug in the error message that is thrown if the number of docs differs between the source and target shards when recovering a shard with a syncId. The source and target doc counts are swapped around.
Closes#21893
Currently, such tasks are only created for default boxes (centos-7, ubuntu-1404) and not all boxes and this can be misleading for developers who want to debug testing scripts on non-default boxes.
Removes `AggregatorParsers`, replacing all of its functionality with
`XContentParser#namedObject`.
This is the third bit of payoff from #22003, one less thing to pass
around the entire application.
If the remote doesn't return a content type then reindex
tried to guess the content-type. This didn't work most
of the time and produced a rather useless error message.
Given that Elasticsearch always returns the content-type
we are dropping content-type detection in favor of just
failing the request if the remote didn't return a content-type.
Closes#22329
The test ping and waited for the ping results to be returned but since we first return the result and then close temporary connections, assertions are tripped that expects all connections to close by end of test .
Closes#22497
This commit checks for a null BytesReference as the value for `source`
in GetResult#sourceRef and simply returns null. Previously this would
have resulted in a NPE. While this does seem internal at first glance, it can affect
user code as a GetResponse could trigger this when the document is missing.
Additionally, the CompressorFactory#uncompressIfNeeded now requires a
non-null argument.
This patch fixes the incorrect indentation in the REST tests, which makes tests in language runners (eg. Ruby, Python) to fail, since the skip clause is parsed as an empty value. Tha Java YAML parser is smarter/lenient about whitespace, so it doesn't catch this.
The recovery process started during primary relocation of shadow replicas accesses the engine on the source shard after it's been closed, which results in the source shard failing itself.
Right now closing a shard looks like it strands refresh listeners,
causing tests like
`delete/50_refresh/refresh=wait_for waits until changes are visible in search`
to fail. Here is a build that fails:
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+multi_cluster_search+multijob-darwin-compatibility/4/console
This attempts to fix the problem by implements `Closeable` on
`RefreshListeners` and rejecting listeners when closed. More importantly
the act of closing the instance flushes all pending listeners
so we shouldn't have any stranded listeners on close.
Because it was needed for testing, this also adds the number of
pending listeners to the `CommonStats` object and all API to which
that flows: `_cat/nodes`, `_cat/indices`, `_cat/shards`, and
`_nodes/stats`.
In pre 2.x versions, if the repository was set to compress snapshots,
then snapshots would be compressed with the LZF algorithm. In 5.x,
Elasticsearch no longer supports the LZF compression algorithm. This
presents an issue when retrieving snapshots in a repository or upgrading
repository data to the 5.x version, because Elasticsearch throws an
exception when it tries to read the snapshot metadata because it was
compressed using LZF.
This commit gracefully handles the situation by introducing a new
incompatible-snapshots blob to the repository. For any pre-2.x snapshot
that cannot be read, that snapshot is removed from the list of active
snapshots, because the snapshot could not be restored anyway. Instead,
the snapshot is recorded in the incompatible-snapshots blob. When
listing snapshots, both active snapshots and incompatible snapshots will
be listed, with incompatible snapshots showing a `INCOMPATIBLE` state.
Any attempt to restore an incompatible snapshot will result in an
exception.
`ToXContentObject` extends `ToXContent` without adding new methods to it, while allowing to mark classes that output complete xcontent objects to distinguish them from classes that require starting and ending an anonymous object externally.
Ideally ToXContent would be renamed to ToXContentFragment, but that would be a huge change in our codebase, hence we simply document the fact that toXContent outputs fragments with no guarantees that the output is valid per se without an external ancestor.
Relates to #16347
This is related to #22116. A logIfNecessary() call makes a call to
NetworkInterface.getInterfaceAddresses() requiring SocketPermission
connect privileges. By moving this to bootstrap the logging call can be
made before installing the SecurityManager.
1. Escape sequences we're working. For example `\\` is now correctly
interpreted as `\` instead of `\\`. Same with `\'` being `'` and
`\"` being `"`.
2. `'` delimited strings weren't allowed to contain `"`s but it looked
like they were intended to support it. Now they do.
3. Improves the error message when the script contains an invalid
escape sequence inside a string to include a list of the valid
escape sequences.
Closes#22372
The JDK 9 compiler (b151) emits the warning "No processor claimed any of these annotations" for annotations that would be runtime annotation. Maybe a
regression from https://bugs.openjdk.java.net/browse/JDK-8039469. This is a quick fix so that compilation works again.
Today when an index is shrunk the version information is not carried over
from the source to the target index. This can cause major issues like mapping
incompatibilities for instance if an index from a previous major version is shrunk.
This commit ensures that all version information from the soruce index is preserved
when a shrunk index is created.
Closes#22373
Provides an example of using is and an example return description
and explains that we've added descriptions for some tasks but not
even close to all of them. And that we expect to change the
descriptions as we learn more.
Closes#22407
* Fix example
Getting a single task is always detailed, no need to specify.
* Rewrite like imotov wants it
Netty plays a lot of games with recycling byte buffers in thread local
caches, and using a pooled byte buffer allocator to reduce pressure on
the garbage collector.
The recycler in particular appears to be fraught with peril. It appears
that there are circumstances where the recycler does not recycle quickly
enough and can exceed its capacity leading to heap exhaustion and out of
memory errors. If you spend a few minutes reading the history of the
recycler on the Netty GitHub issues, it appears it has been nothing but
a source of trouble, and the project itself has an open issue that
proposes disabling by default and possibly even removing the recycler.
The pooled byte buffer allocator has problems itself. It sizes the pool
based on the number of runtime processors and can indeed grab a very
large percentage of the heap (in some cases 50% or more). Additionally,
the Netty project continues to struggle with leaks here.
We are seeing users struggle with issues in 5.x that I think are largely
driven by some of the problems here with Netty.
This change proposes to disable the recycler, and to disable the pooled
byte buffer allocator. I think that disabling these features will return
some of the stablity that these features appear to be losing us.
I have done performance testing on my workstation with disabling these
and I do not see a difference in performance. I propose that we make
this change in master and let some nightly benchmarks run to confirm
that there is not a difference in performance. If we are comfortable
with the performance changes, I propose backporting this to all active
branches.
Relates #22452
Clinton Gormley
A.N
Yannick Welsch
Boaz Leskes
Tanguy Leroux
Jim Ferenczi
Martijn van Groningen
henakamaMSFT
Nik Everett
Jay Modi
Karel Minarik
Ali Beyad
javanna
animageofmine
Ryan Ernst
Tim B
Simon Willnauer
Jason Tedor
Johannes Kanavin
Jason Veatch